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www.irf.com IRAUDAMP3 120w x 6 channel class d audio power amplifier using irs20124s and irf6645 by jun honda, johan strydom and jorge cerezo table of contents page introduction .......................................................................................... 1 specificatio ns ....................................................................................... 2 functional descr iption.......................................................................... 4 protecti on .............................................................................................11 typical perf ormanc e ............................................................................15 design docu ments ..............................................................................20 the IRAUDAMP3 reference design is an example of a complete six-channel 120w half-bridge class d audio power amplifier. the reference design is intended to demonstrate how to use the irs20124s, implement protection circuits, and design an optimum pcb layout using irf6645 directfet ? mosfets. the modular design consists of a motherboard with three identical daughter boards. the resulting design requires no heat-sin king for normal operation. the reference design includes all the required housekeeping power supplies for ease of use.
www.irf.com 1 introduction the IRAUDAMP3 reference design is an example of a complete six-channel 120w half- bridge class d audio power amplifier. the reference design is intended to demonstrate how to use the irs20124s, implement prot ection circuits, and design an optimum pcb layout using irf6645 directfet ? mosfets. the modular design consists of a motherboard with three identical daughter boards. the resulting design requires no heat- sinking for normal operation. the reference design includes all the required housekeeping power supplies for ease of use. applications av receivers home theater systems mini component stereos sub-woofers features output power: 120w x 6 channels, (thd = 1%) residual noise: 56 v, ihf-a weighted, aes-17 filter distortion: 0.01% thd+n @ 60w, 4 ? efficiency: 94% @ 120w, 4 ? single channel driven, class d stage multiple protection features: ocp, ovp, uvp, dc protection, otp pwm modulator: self-oscillating half-bridge topology with optional clock synchronization
www.irf.com 2 specifications general test conditions (unless othe rwise noted) notes / conditions supply voltage 35v load impedance 4 ? self-oscillating frequency (adjus table) 400khz no input signal gain setting 26db 1vrms input sensitivity electrical data (typical) notes / conditions ir devices used irs20124s gate driver, irf6645 directfet mosfet modulator self-oscillating, 2nd order sigma-delta modulation, analog input power supply range 25-35v output power ch1-6: (1% thd+n) 120w 1khz output power ch1-6: (10% thd+n) 170w 1khz rated load impedance 4 ? damping factor 40 1khz, relative to 4 ? load supply current <250ma no input signal total idle power consumption 14w no input signal board efficiency 94% single channel driven, 120w, class d stage audio performance (typical) notes / conditions thd+n, 1w thd+n, 10w thd+n, 60w 0.006% 0.005% 0.010% 1khz, single channel driven dynamic range 112db a-weighted, aes-17 filter, single channel operation residual noise 20hz - 20khz bw, a-weighted 97 v 56 v self-oscillating ? 400khz internal clock ? 395khz channel separation 87db 72db 100hz 10khz frequency response : 20hz-20khz : 20hz-40khz 1db 3db 1w, 4 ? - 8 ? load thermal performance (typical) notes / conditions idling t c =33 c t pcb =42 c no signal input, ta=25 c 2ch x 15w (1/8 rated power) t c =58 c t pcb =77 c continuous 2ch x 120w (rated power) t c =79 c t pcb =101 c 90 seconds physical specifications (typical) notes / conditions dimensions 13.7?(l) x 5.0?(w) note: specifications are typical and not guaranteed.
www.irf.com 3 connection diagram typical test setup pin description ch-1 in j3 analog input for ch-1 ch-2 in j2 analog input for ch-2 ch-3 in j9 analog input for ch-3 ch-4 in j8 analog input for ch-4 ch-5 in j14 analog input for ch-5 ch-6 in j13 analog input for ch-6 power j4 positive and negative supply (+b / -b) ch-1 out j5 output for ch-1 ch-2 out j6 output for ch-2 ch-3 out j10 output for ch-3 ch-4 out j11 output for ch-4 ch-5 out j15 output for ch-5 ch-6 out j16 output for ch-6 ext clk j17 external clock sync dcp out j21 dc protection relay output volume j9 j8 j3 j2 j14 j13 j10 j11 j5 j6 j15 j16 j4 r180 s3 s4 tp1 tp2 tp1 tp2 tp1 tp2 ch3 output ch4 output ch1 output ch2 output ch5 out p ut ch6 output ch3 input ch4 input ch1 input ch2 input ch5 input ch6 input g led orange led green s1 led led led audio signal generator 4 ? 35v, 10a dc supply 4 ? 4 ? 4 ? 4 ? 4 ? 35v, 10a dc supply 250w, non-inductive 250w, non-inductive j17 j21
www.irf.com 4 power-on procedure 1. apply 35v at the same time 2. apply audio signal note: improper power on procedure could result start up failure. power-off procedure 1. remove audio input signal 2. turn off 35v at the same time functional description class d operation referring to ch-1 as an example, the op-amp u1 forms a front-end second-order integrator with c1 & c2. this integrator receives a rectangular waveform from the class d switching stage and outputs a quadratic oscillatory waveform as a carrier signal. to create the modulated pwm, the input signal shifts the average value of this quadratic waveform (through gain relationship between r28 and r9 + r1) so that the duty varies according to the instantaneous value of the analog input signal. the signal is then quantized by the threshold of the cmos inverter u2. the transistor q1 level-shifts the pwm signal down to the irs20124s gate-driver (referenced to ?b) which internally splits this signal into two signals, with opposite polarity and added deadtime, for high-side and low-side mosfet gate signals respectively. the irs20124s drives two irf6645 directfet mosfets in the power-stage to provide the amplified digital pwm waveform. the amplified analog output is re-created by demodulating the amplified pwm. this is done by means of the lc low-pass filter (lpf) formed by l1 and c18, which filters out the class d switching carrier signal. simplified block diagram of class d amplifier comparator irf6645 feedback gnd lpf +b -b irs20124s gate driver level shifter u1 u2 q1 u1 daughter board integrator
www.irf.com 5 power supplies the IRAUDAMP3 has all the necessary housekeeping power supplies onboard and only requires a pair of symmetric dual power supplies ranging from 25v to 35v (+b, gnd, - b) for operation. the internally generated housekeeping power supplies include a 5v supply for signal processing, while a +12v supply, referenced to ?b, is included to supply the class d gate driver stage. for the externally applied power, a regulated power supply is preferable for performance measurements, but not always necessary . the bus capacitors, c16-17 (c40-41, c64- 64), on the board along with high-frequency bypass caps, c88-89 (c90-91, c92-93) are designed to take care of the high-frequency ripple-current components from switching action only. a set of bus capacitors having enough capacitance to handle the audio ripple current must be placed outside the board if an unregulated power supply is used. at initial power-on, the shutdown condition (orange led) will latch for about three seconds before starting normal operation. always apply supply voltages before applying any audio signals and always remove audio signals prior to removing the power supplies. bus pumping since the IRAUDAMP3 is a half bridge configuration, bus pumping occurs when the amplifier outputs a low frequency signal below 100hz. under normal operation during one half cycle, energy flows from one supply, through the load and into the other supply, thus causing a voltage imbalance by pumping up the bus voltage. this condition is reversed during the next half cycle (resulting in bus pumping of the other supply). bus pumping is worsened under the following conditions: ? lower frequency (bus pumping continues longer) ? higher power / output voltage and / or lower load impedance (more energy is transferred between supplies) ? smaller bus capacitors (the same energy will cause a larger voltage increase) the IRAUDAMP3 has protection features that will shutdown the switching operation if the bus voltage becomes too high (> 40v) or too low (< 20v). one of the easiest countermeasures is to drive both of the channels out of phase so that the energy flow from one channel is consumed by the other and does not return to the power supply. input a proper input signal is an analog signal below 20khz, up to 3.5v peak, having a source impedance of less than 600 ? . a 30khz to 60khz input signal can cause lc resonance in the output lpf, resulting in an abnormally large amount of reactive current flowing through the switching stage (especially at 8 ? or open load), causing ocp activation. the IRAUDAMP3 has an rc (zobel) network, to damp the resonance and protect the board in such a condition. however, these supersonic input frequencies should be avoided. the input to each of the six channels is made using a separate mono rca connector. although all six channels share a common ground, it is necessary to connect each channel separately to limit noise and crosstalk between channels.
www.irf.com 6 output all the outputs for the IRAUDAMP3 are single-ended and therefore have terminals labeled (+) and (-) with the (-) terminal connected to power ground. each channel is optimized for a 4 ? speaker load for a maximum output power (120w), but is capable of operating with higher load impedances, at reduced power, at which point, the frequency response will have a small peak at the corner frequency of the output lc lpf. the IRAUDAMP3 is stable with capacitive loading, however, it should be realized that the frequency response will be degraded by heavy capacitive loading of more than 0.1f gain setting / volume control the IRAUDAMP3 has an internal volume control (potentiometer r156 labeled ?volume?) for gain adjustment. gain settings for all six channels are tracked and controlled by the volume control ic setting the gain from the micro controller ic, u1. the maximum volume setting (fully clockwise) corresponds to a total gain of +37.9db (78.8v/v). the total gain is a product of the power stage gain, which is a constant +23.2db, and the input-stage gain is directly controlled by the volume adjustment. the volume range is about 100db with minimum volume setting to ?mute? the system with an overall gain of less than -60db. for best performance in your testing, the internal volume control should be set to a gain of 21.9v/v, or 1vrms input will result in rated output power (120w into 4 ? ),allowing for a >11db overdrive. self-oscillating pwm modulator the IRAUDAMP3 class d audio power amplifier is based on a self-oscillating type pwm modulator for the lowest component count and a robust design. this topology is basically an analog version of a second-order sigma-delta modulation having a class d switching stage inside the loop. the benefit of sigma-delta modulation in comparison to the carrier signal-based modulator is that all the error in the audible frequency range is shifted away into the inaudible upper frequency range by the nature of its operation, and applies a sufficient amount of correction. the self-oscillating frequency is a determined by the total delay time in the control loop of the system. the delay of the logic ci rcuits, the irs20124s gate-driver propagation delay, the irf6645 directfet mosfet switching speed, the time constant of the front end integrator (e.g. r15 + r19, c1 and c2 for ch-1) and supply-voltages are all critical factors of the self-oscillating frequency. under nominal conditions, the switching- frequency is around 400khz with no audio input signal. adjustments of self-oscillating frequency the pwm switching frequency in this type of self-oscillating schem e greatly impacts audio performance, both in absolute frequency and frequency relative to the other channels. at higher frequencies, distortion due to switching time becomes significant, while at lower frequencies, the bandwidth of the amplifier suffers. in relative terms, interference between channels is most significant if the relative frequency difference is within the audible range. normally when adjusting the self-oscillating frequency of the different channels, it is best to either match the frequencies accurately, or have them separated by at least 25khz. in this design, it is possible to change the self-oscillating frequency from about 180khz up to 470khz.
www.irf.com 7 potentiometers for adjustin g self-oscillating frequency component number adjustment r19 switching frequency for ch-1* r20 switching frequency for ch-2* r54 switching frequency for ch-3* r55 switching frequency for ch-4* r86 switching frequency for ch-5* r87 switching frequency for ch-6* *adjustments have to be done at an idling condition with no signal input. switches and indicators there are three different indicators on the reference design: ? an orange led, signifying a fault / shutdown condition when lit ? a green led on the motherboard indicates power is applied to the motherboard ? green leds on each of the three daughter boards, signify power is on there are three switches on the reference design: ? switch s1 is a ?shutdown? push-button. pushing this button has the same effect as having a fault condition. the circuit will re-start about 3 seconds after the shutdown button is released. ? switch s2: internal clock-sync frequency selector. this feature demonstrates avoiding am radio interference by slightly modifying the switching frequency. with s3 is set to int, the two settings ?h? and ?l? will modify the internal clock frequency by about 20khz to 40khz, either higher ?h? or lower ?l?. the actual internal frequency is set by potentiometer r180 - ?int osc freq?. ? switch s3: oscillator selector ? this 3-position switch selects between the internal self oscillator (?self?), internal- (?int?) or external clock-sync (?ext?). switching frequency lock / synchronization feature for single-channel operation, the self-oscillating switching scheme will yield the best audio performance. the self-oscillating frequency does, however, change with duty ratio. this varying frequency can interfere with am radio broadcasts. a constant switching frequency, with its harmonics that are shifted away from the am carrier frequency, is preferred. apart from am broadcasts, the addition of multiple channels can also reduce audio performance at low power, and can lead to increased residual noise. both characteristics of the self-oscillating switching scheme can be improved through the addition of clock frequency locking / synchronization. please note that the switching frequency lock / synchronization feature is not possible for all frequencies and duty ratios, but only operates within a limited frequency and duty- ratio range below the self-oscillating frequency (see figure below).
www.irf.com 8 200 250 300 350 400 450 10 20 30 40 50 60 70 80 90 duty-ratio (%) frequency (khz) self-osc.(khz) clk @ 250khz clk @ 275khz clk @ 300khz clk @ 325khz clk @ 350khz clk @ 375khz clk @ 395khz typical lock frequency range vs. pwm duty ratio for different internal clock frequencies (self-oscillating frequency set to 400khz with no input) considering the thd+n ratio vs. output power results below, it can be seen that having all channels driven (acd) with the self oscillator, noise levels increase, especially below the 5w range. residual noise doubles (see specifications ? audio performance) compared to having only a single channel driven. by locking the oscillator frequency, the residual noise can be lowered to that of a single channel driven system. the output power range, for which the frequency locking is successful, depends on how much lower the locking frequency is with respect to the self-oscillating frequency. as the locking frequency is lowered (from 395khz to 350khz and then 300khz), the output power range (where locking is achieved) is extended. once locking is lost, however, the audio performance is reduced, with lower locking frequencies leading to larger thd. in the IRAUDAMP3, this switching frequency lock / synchronization feature can be achieved through the use of either an internal or an external clock input (selectable through s3). if internal (int) clock is selected, the internally generated clock signal will be used and can be adjusted by setting potentiometer r180 - ?int osc freq?. if external (ext) clock signal is selected, a 0-5v, square-wave (50% duty-ratio) logic- signal must be applied to j17. offset null (dc offset) the IRAUDAMP3 has been designed such that no output-offset nulling is required. the reference boards will have dc offsets tested to be less than 50mv. lock frequency range self-oscillating frequency
www.irf.com 9 0. 001 100 0. 002 0. 005 0. 01 0. 02 0. 05 0. 1 0. 2 0. 5 1 2 5 10 20 50 % 100m 200 200m 500m 1 2 5 10 20 50 100 w thd+n ratio vs. output power for different switching frequency lock / synchronization conditions gate driver ic the IRAUDAMP3 uses the irs20124s, which is a high-voltage (200v), high-speed power mosfet gate driver with internal deadtime and shutdown functions specially designed for class d audio amplifier applications. in this design, deadtime can be minimized to optimize performance while limiting shoot-through. because of this, there is no gate timing adjustment on the board. selectable deadtime through the dt/sd pin voltage is an easy and reliable function which requires only two external resistors, r1 and r2. the bi-directional current sensing feature is also selected externally by resistors r3, r4, and r5 and can protect the irs20124s and shutdown the directfet mosfets during over-current conditions. system-level view of gate driver irs20124s self osc. (single channel driven) self osc. (acd) @ 400khz int. clk.. (acd) @ 395khz int. clk.. (acd) @ 300khz int. clk.. (acd) @ 350khz
www.irf.com 10 selectable deadtime the dt/sd pin provides two functions: 1) setting deadtime and 2) selecting shutdown. the irs20124s determines its operation mode based on the voltage applied to the dt/sd pin. an internal comparator translates which mode is being used by comparing internal reference voltages. threshold voltages for each mode are set internally by a resistive voltage divider off v cc , negating the need for a precise, absolute voltage to set the mode. 1) threshold voltages for the mode selection are set internally, based on different ratios of v cc as indicated in the diagram below. in order to avoid drift from the input bias current of the dt/sd pin, a bias current of greater than 0.5ma is suggested for the external resistor divider circuit. suggested values of resistance that are used to set a deadtime are given below. resistors with up to 5% tolerance can be used. deadtime / operation mode settings vs v dt/sd voltage dead-time mode dead-time r1 r2 dt/sd voltage dt1 ~15ns <10k ? open 1.0 x v cc dt2 ~25ns 3.3k ? 8.2k ? 0.71 x v cc default dt3 ~35ns 5.6k ? 4.7k ? 0.46 x v cc dt4 ~45ns 8.2k ? 3.3k ? 0.29 x v cc 2) in shutdown mode, both mosfets are turned off simultaneously to stop operation and protect the circuit during fault conditions. if the dt/sd pin detects an input voltage below the threshold, 0.23 x v cc , the irs20124s will output 0v at both ho and lo outputs, forcing the switching output node to go into a high impedance state.
www.irf.com 11 protection the IRAUDAMP3 includes protection featur es for over-voltage (ovp), under-voltage (uvp), over-current (ocp), dc-voltage (dcp ) and over-temperature protection (otp). the ovp, dcp, ocp and otp uses or logic and will shutdown the output power amplifier (mosfets) if any one or more protection feature is activated (by pulling the dt/sd pin low). once a fault condition is detected and the power amplifier is shutdown, the shutdown pin will remain low (latched) for about three seconds. if a fault is not cleared, or re-occurs after the restart of the power amplifier, the dt/sd pin will again latch. thus this circuit will hiccup until the fault is removed. the under-voltage protection (uvp) is separate from the above protection circuit and operates by turning off the v cc into to the irs20124s once the input voltage drops too low. when v cc starts dropping to zero, the uvlo protection within the irs20124s will shutdown the power amplifier. resetting the protection circuit the IRAUDAMP3 has a number of protection circuits to safeguard the system and speakers during operation. if any fault condition is detected, the shutdown circuit will latch for about three seconds, during which time the orange led will turn on. if the fault condition has not cleared, the protection circuit will hiccup until fault is removed. there is no manual reset option. dc voltage protection (dcp) dc voltage output protection is provided to protect the speakers from dc current. this abnormal condition is rare and is likely caused when the power amplifier fails and one of the high-side or low-side irf6645 mosfets remain in the on state. dc protection is activated if the output has more than 4vdc offset (typical). under this fault condition, the feeding power supplies must be shutdown. since these are external to the reference design board, an isolated relay is provided (p 1) for further systematic evaluation of dc voltage protection to transmit this condition to the power supply controller and is accessible through connector j21 (pins of j21 are shorted during fault condition). functional block diagram of protection circuit implementation
www.irf.com 12 over-voltage protection (ovp) over-voltage protection will shutdown the amplifier if the bus voltage between gnd and +b exceeds 40v. the threshold is determined by the sum of the zener diode voltage of z11 and the v be of q11. as a result, it protects the board from bus-pumping at very low audio signal frequencies by shutting down the amplifier. ovp will automatically reset after three seconds. the isolated relay is also activated during this fault condition. since the +b and ?b supplies are normally symmetrical, (bus pumping, although asymmetrical in time, will pump the bus symmetrically in voltage level.) it is considered sufficient to only sense one of the two supply voltages for ovp. over-current protection (ocp) the internal over-current protection shuts down the irs20124s if a trip threshold-level of the bi-directional current-sensing circuit is exceeded. when this fault occurs, the oc-pin is pulled low for at least 100ns. to keep the irs20124s from re-starting, the oc-pin output is fed back to the dt/sd pin, using the three second latch. bi-directional over-current sensing the bi-directional current sensing block has an internal 2.21v level shifter feeding the signal to a comparator. the ocset1 pin sets the positive current threshold, and is given a trip level at vsoc+, which is ocset1 - 2.21v. in the same way, the ocset2 pin, vsoc- is set at ocset2 ? 2.21v. oc set1 oc set2 vs lo oc + + - - or and simplified functional block diagram of bi-directional current sensing how to set oc-threshold the external resistors r3, r4, and r5 are used as voltage dividers to set ocset1 and ocset2. the trip threshold voltages, vsoc+ and vsoc-, are determined by the required trip current levels, itrip+ and itrip-, and the device on-resistance, r ds(on) , in the low-side mosfet. please note that since the on-resistance of the low-side mosfet is temperature dependent, the actual over-current trip level will decrease as the mosfet heats up.
www.irf.com 13 since the sensed voltage of vs is shifted up by 2.21v internally and compared with the voltages fed to the ocset1 and ocset2 pins, the required value of ocset1 with respect to com is: vocset1 = vsoc+ + 2.21 = itrip+ x r ds(on) + 2.21 the same relation holds between ocset2 and vsoc-: vocset2 = vsoc- + 2.21 = itrip- x r ds(on) + 2.21 on the reference design, the values of r3, r4 and r5 have been set to 10.0k ? , 1.30k ? and 1.74k ? respectively. these values result in vsoc+ and vsoc- limits of 0.60v and for an r ds(on) of 28m ? (from datasheet of irf6645), a over-current trip level of approximately 21a is achieved. please refer to the irs20124s data sheet for a complete description and method for choosing r3, r4 and r5. due to the duty cycle limitation in bi-directional current sensing in the irs20124, the ocp will work up to 100w. for short-circuit protection beyond this, a number of alternative solutions can be implemented. these include using either external current- sensing or alternative gate driver ic havi ng current-sensing function that measure both hs and ls mosfet currents independently, such as the irs20954. over-temperature protection (otp) a separate ptc resistor is placed in close proximity to the irf6645 directfet mosfets on each daughter board for each of the amplifier channels. if the resistor temperature rises above 100 c, the otp is activated. this temperature protection limit yields a pcb temperature at the mosfets of about 100 c. this temperature protection limit is due to the use of fr4 as a substrate material. under-voltage protection (uvp) under-voltage protection will shutdown the amplifier if the bus voltage between gnd and +b falls below 20v by cutting of the v cc supply to the irs20124s ic. if the supply to the ic drops below 9v (typical), the uvlo within the ic will shutdown the power amplifier. bridged output the IRAUDAMP3 is not intended for btl operation. however, the btl operation can be achieved by connecting the speaker load between the ?+? terminals of two adjacent channels and feeding the same input signal to both channels (with one input signal inverted). in btl operation, minimum load impedance is 8 ? , rated power is 240w, non- clipping.
www.irf.com 14 thermal considerations from the nature of typical music signals, while the instantaneous power can reach >120w, the average power is limited to 1/8 th of rated power. this is generally considered to be the normal operating condition in safety standards and the IRAUDAMP3 requires no heatsinking under normal operation. for higher average power conditions, however, additional cooling would be required. 50% 55% 60% 65% 70% 75% 80% 85% 90% 95% 100% 0 20 40 60 80 100 120 140 160 180 output power (w) power stage efficiency (%) efficiency vs. output power, 4 ? single channel driven, t ambient = 25 c thermal image of daughter board running at 2ch x 1/8th rated power - steady state, t c < 58 c 1% thd+n 10% thd+n 58 c 77 q c
www.irf.com 15 typical performance b supply = 35v, load impedance = 4 ? , 1khz audio signal, self oscillator @ 400khz and internal volume control set to give required output with 1vrms input signal, unless otherwise noted. international rectifier 11/21/05 19:23:4 0 a- a thd+n vs frequency -14 +4 -12 -10 -8 -6 -4 -2 +0 +2 d b r a 20 200k 50 100 200 500 1k 2k 5k 10k 20k 50k 100k hz green ch1 - 4 ? , 2v output yellow ch1 - 8 ? , 2v output frequency characteristics vs. load impedance international rectifier 12/19/05 09:27:51 a-a frequency response -120 +0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b 20 20k 50 100 200 500 1k 2k 5k 10k hz red ch2 ? ch1, 60w, self oscillator @ 400khz green ch2 ? ch1, 60w, internal clock @ 395khz channel separation vs. frequency 8 ? 4 ?
www.irf.com 16 international rectifier 11/21/05 18:55:2 0 a-a thd+n vs power 0. 001 100 0. 002 0. 005 0. 01 0. 02 0. 05 0. 1 0. 2 0. 5 1 2 5 10 20 50 % 100m 200 200m 500m 1 2 5 10 20 50 100 w t green ch1, b = 35v, volume gain 21.9v/v yellow ch1, b = 30v, volume gain 21.9v/v red ch1, b = 25v, volume gain 21.9v/v thd+n ratio vs. output power international rectifier 11/21/05 18:37:01 a-a thd+n vs power 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 20 50 % 100m 200 200m 500m 1 2 5 10 20 50 100 w t green ch1 - acd, b = 35v, volume gain 21.9v/v yellow ch1 - acd, b = 30v, volume gain 21.9v/v red ch1 - acd, b = 25v, volume gain 21.9v/v thd+n ratio vs. output power (acd) 25v 35v 30v 25v 35v 30v
www.irf.com 17 international rectifier 11/21/05 19:06:2 5 a-a thd+n vs frequency 0. 001 100 0. 002 0. 005 0. 01 0. 02 0. 05 0. 1 0. 2 0. 5 1 2 5 10 20 50 % 20 20k 50 100 200 500 1k 2k 5k 10k hz green ch1, 1w output yellow ch1, 10w output red ch1, 100w output thd+n ratio vs. frequency international rectifier 11/21/05 19:11:5 6 a- a thd+n vs frequency 0. 001 100 0. 002 0. 005 0. 01 0. 02 0. 05 0. 1 0. 2 0. 5 1 2 5 10 20 50 % 20 20k 50 100 200 500 1k 2k 5k 10k hz green ch1 - acd, 1w output yellow ch1 - acd, 10w output red ch1 - acd, 100w output thd+n ratio vs. frequency (acd) 10w 1w 100w 10w 1w 100w
www.irf.com 18 international rectifier 11/22/05 10:27:21 a-a fft spectrum analysis -120 +0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 10 20k 20 50 100 200 500 1k 2k 5k 10k hz green ch1 - acd, 1v, 1khz , self oscillator @ 400khz red ch1 - acd, 1v, 1khz, internal clock @ 395khz frequency spectrum (acd) international rectifier 11/22/05 10:24:5 7 a-a fft spectrum analysis -120 +0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 10 20k 20 50 100 200 500 1k 2k 5k 10k hz green ch1 - acd, no signal, self oscillator @ 400khz red ch1 - acd, no signal, internal clock @ 395khz residual noise (acd) s elf int. self int.
www.irf.com 19 60w / 4 ? , 1khz, thd+n=0.009% 174w / 4 ? , 1khz, thd+n=10% measured output and distortion waveforms typical ocp waveforms showing oc output and sd input inductor current vs p in oc pin sd p in inductor current vs p in oc pin sd p in
www.irf.com 20 IRAUDAMP3 design documents motherboard schematics: housekeeping and protection circuits
www.irf.com 21 audio channels 1 and 2
www.irf.com 22 audio channels 3 and 4
www.irf.com 23 audio channels 5 and 6
www.irf.com 24 daughter board schematics: daughter-board schematic with cl ass d stage for 2 audio channels
www.irf.com 25 IRAUDAMP3 bill of materials motherboard: IRAUDAMP3 motherboard bill of material no designator # footprint parttype part no vender 1 c1, c2, c3, c4 4 1206 1nf, 200v pcc2009ct-nd digikey 2 c5, c6, c30, c31, c54, c55 6 axial0.19r 150pf, 500v 338-1052-nd digikey 3 c7, c8, c10, c11, c32, c33, c35, c36, c56, c57, c59, c60 12 cr3225-1210 3.3uf, 50v 445-1432-1-nd digikey 4 c9, c12, c13, c14, c24, c25, c48, c49, c72, c73, c146 11 0805 open open 5 c16, c17, c40, c41, c64, c65 6 rb5/10 470uf,50v 01e9650 newark 6 c18, c19, c42, c43, c66, c67 6 axial0.2r cap open 7 c18_2, c19_2, c4 2_2, c43_2, c66_2, c67_2 6 cap mkp 0.47uf, 250v 495-1298-nd digikey 8 c20, c21, c130, c131, c132, c133 6 axial0.3r 0.1uf, 63v bc2054-nd digikey 9 c22, c126, c127, c128, c129, c137 6 0805 120pf, 50v pcc121cgct-nd digikey 10 c23, c80 2 rb2/5-16v 100uf, 16v 493-1283-nd digikey 11 c26, c27, c28, c29, c50, c51, c 52, c53 8 0805 1nf, 200v pcc1997ct-nd digikey 12 c46, c58, c70, c74, ,c75, c76, c77, c78, c79, c81, c99, c100, c101, c110, c111, c116, c121, c122 18 rb2/5 10uf, 50v 03b2235 newark 13 c82, c83, c84, c85, c86, c87 6 cr3225-1210 4.7uf, 25v pcc2251ct-nd digikey 14 c88, c89, c90, c91, c92, c93 6 axial0.1r cap open 15 c94, c95 2 0805 0.1uf, 50v pcc1840ct-nd digikey 16 c96 1 0805 47pf, 50v pcc470cgct-nd digikey 17 c97, c117 2 0805 4.7uf, 16v pcc2323ct-nd digikey 18 c98, c124 2 0805 10nf, 50 v pcc103bnct-nd digikey 19 c118 1 0805 1nf, 50v pcc102cgct-nd digikey 20 c119 1 0805 1500pf, 50v pcc2004ct-nd digikey 21 c120 1 0805 220pf, 50v pcc1953ct-nd digikey 22 c123 1 1206 47nf, 50v 311-1178-1-nd digikey 23 c125, c134, c135, c136, c138, c139 6 1206 0.1uf, 50v pcc104bct-nd digikey 24 d1, d2, d4, d5, d6, d7, d8, d10, d11, d12, d13, d14, d15, d16, d17,d18, d19, d20, d21 19 sod-123 1n4148 1n4148wdict-nd digikey 25 d3 1 sod-123 open 26 d30, d31 2 sod-123 ma2yd 2300lct ma2yd2300lct-nd digikey 27 hs1 1 heat_s6in1 heat sink 294-1086-nd digikey 28 j1, j7, j12 6 con eisa31 con eisa31 a26453-nd digikey 29 j2, j3, j8, j9, j13, j14 6 cp1418 1418-nd cp-1418-nd digikey 30 j4 1 j header3 277-1272 277-1272-nd digikey 31 j5, j6, j10, j11, j15, j16 6 mkds5/2-9.5 277-1022 277-1271-nd digikey 32 j17 1 bnc-ra-con bnc a24497-nd digikey 33 j18, j19, j20 6 con_powe r con_power a26454-nd digikey 34 j21 1 ed1567 ed1567 ed1567 digikey 35 l1, l2, l3, l4, l5, l6 6 inductor 18uh custom made 36 led gr 1 led rb2/5 404-1109 404-1109-nd digikey 37 led orange 1 led rb2/5 404-1107 404-1107-nd digikey 38 p1 1 dip-6 pvt412 pvt412-nd digikey 39 q1, q2, q3, q7, q8, q13, q14, q19, q20, q26 10 sot23-bce mmbt5401 mmbt5401dict-nd digikey 40 q4, q5, q9 3 sot23-bce mmbt5551 mmbt5551dict-nd digikey 41 q6, q10, q11 3 sot23-bce mmbt3904 mmbt3904dict-nd digikey 42 q27 1 sot89 fx941 fcx491tr-nd digikey 43 r1, r5, r36, r40, r68, r72, r117 7 1206 1k p1.0kect-nd digikey 44 r2, r3, r4, r6, r7, r8, r14, r32, r37, r38, r39, r41, r42, r43, r69, r70, r71, r73, r74, r75, r96, r143, r168, r175, r191 25 0805 1k p1.0kact-nd digikey 45 r9, r11 2 cr5025-2010 46.4k, 1w 01h0485 newark 46 r10, r13, r45, r112, r114, r118, r119, r120, r176, r 186, r187, r190 12 0805 10k p10kact-nd digikey 47 r12, r25, r139, r140, r141, r142 6 1206 2.2k p2.2kect-nd digikey 48 r15, r17, r50, r52, r67, r82, r84, r107, r111, r121, r129, r154, r163, r172, r179, r205 16 0805 100r p100act-nd digikey 49 r16, r18, r21, r22, r23, r24, r51, r53, r56, r57, r58, r59, r83, r85, r88, r89, r90, r91, r122, r123, r125, r126, r136, r137 24 0805 4.7r p4.7act-nd digikey 50 r19, r20, r54, r55, r86, r87 6 pot_srm 1k 3361p-102gct-nd digikey
www.irf.com 26 51 r26, r27, r31, r6 5, r66, r113, r150, r151, r152, r181, r182, r183, r184 13 0805 100k p100kact-nd digikey 52 r28, r29, r60, r61, r92, r93 6 1206 3.3k p3.3kect-nd digikey 53 r30, r62, r79, r81, r97, r98, r130, r131, r133, r145, r153, r164, r165, r169, r170, r177, r189, r198, r199, r200 20 0805 47r p47act-nd digikey 54 r33, r44, r46, r7 6, r78, r100, r101, r102, r103, r104, r105, r146, r197 13 0805 47k p47kact-nd digikey 55 r34, r35, r193, r194, r195, r196 6 2512 10, 1w pt10xct digikey 56 r94, r109, r127, r132, r135, r 166, r216 7 0805 10r p10act-nd digikey 57 r95, r99, r134, r155, r167, r171 6 1206 4.7r p4.7ect-nd digikey 58 r106 1 1206 47k p47kect-nd digikey 59 r108, r110, r218, r219 4 2512 47r, 1w pt47xct-nd digikey 60 r115, r147 2 0805 4.7k p4.7kact-nd digikey 61 r116 1 1206 10k p10kect-nd digikey 62 r156 1 v_control ct2265-nd ct2265-nd digikey 63 r178 1 1206 100r p100ect-nd digikey 64 r180 1 pot 5k pot 3362h-502-nd digikey 65 r188 1 0805 390r p390act-nd digikey 66 r206, r207, r210, r211, r 214, r215 6 0805 open open 67 r217 1 1206 0r p0.0ect-nd digikey 68 s1 1 switch sw-pb p8010s-nd digikey 69 s2 1 sw-eg1908 sw_h-l eg1908-nd digikey 70 s3 1 sw-eg1944 sw-3way_ab eg1944-nd digikey 71 tp 1 open open open 72 u1, u4, u7, u10, u11, u12 6 so-8 tlc081 299-7264-1-nd digikey 73 u2, u3, u5, u6, u8, u9, u17, u18, u19, u20, u21, u22 12 sot25 74ahc1g04 296-1089-1-nd digikey 74 u13 1 to-220 fullpak mc78m12 mc78m12ctos-nd digikey 75 u14 1 to-220 fullpak mc78m05 mc78m05ctos-nd digikey 76 u15 1 to-220 f mc79m05 mc79m05ctos-nd digikey 77 u16 1 sot23-123 mn13821tp mn13821tpct-nd digikey 78 u_1 1 n8a 3310ir01 3310ir01 japan* 79 u_2, u_3, u_4 3 soic16 cs3310 73c8016 newark 80 u_5 1 m14a 74hc04 296-1189-1-nd digikey 81 w43, w51, w52, w53, w67, w68, w77, w78, w96, w97, w101, w102, w104 27 j1-750 jumper zo-1/8w-t digikey 82 w2, w3, w4, w6, w7, w8, w10, w11, w12, w30, w54, w57, w91, w92, w93, w98, w99, w100, w106, w109 20 j1-975 jumper zo-1/8w-t digikey 83 w41 1 j1-720 jumper zo-1/8w-t digikey 84 w14, w23, w34, w39, w40, w42, w59, w103, w107 9 j1-570 jumper zo-1/8w-t digikey 85 w16, w18, w36, w50, w56, w60, w69, w81, w105 9 j1-650 jumper zo-1/8w-t digikey 86 w45, w46, w62, w72 4 j1-350 jumper zo-1/8w-t digikey 87 w22, w25, w27, w55, w85, w90, w95 7 j1-200 jumper zo-1/8w-t digikey 88 w24, w47, w49, w63, w65, w66, w73, w75, w76, w84 10 j1-300 jumper zo-1/8w-t digikey 89 w44, w61, w71, w74, w94, w108 6 j1-430 jumper zo-1/8w-t digikey 90 w20, w58, w79, w87, w88, w89 6 j1-500 jumper zo-1/8w-t digikey 91 z1 1 sod-123 18v bzt52c18-fdict-nd digikey 92 z7, z9 2 dl-41 4.7v zm4732adict-nd digikey 93 z8 1 sod-123 15v bzt52c15-fdict-nd digikey 94 z11 1 sod-123 39v bzt52c39-13-fditr-nd digikey 95 z12 1 sod-123 24v bzt52c24-fdict-nd digikey 96 volume control knob 1 mccpmb1 newark 97 thermalloy with screw 3 46f4081 newark 98 standoffs 5 2210k-nd digikey 99 screw 5 h354-nd digikey 100 washer lock 5 h244-nd digikey *tachyonix corporation, 14 gonaka jimokuji jimokuji-cho, ama-gun aichi, japan 490-1111 http://www.tachyonix.co.jp info@tachyonix.co.jp
www.irf.com 27 output inductor specification: core: t94-2 from micrometals wire: 22 awg # turns: 48 nominal inductance: 18uh finish: no varnish or dipping of core required suggested pcb footprint for custom output inductor voltage regulator mounting: 1120mil 375mil 187.5mil radius 2x 60mil holes item description 1 insulator thermalfilm 2 shoulder washer 3 flat washer #4 4 no. 4-40 unc-2b hex nut 5 no. 4-40 unc-2a x 1/2 long phillips pan head screw 6 lockwasher, no.4 7 heatsink 8 pcb 7 8
www.irf.com 28 daughter board: IRAUDAMP3 dauther-boa rd bill of material no designator # footprint part type part no vendor 1 c1, c2 2 0805 100pf pcc101cgct-nd digikey 2 c3, c4 2 1206 2.2uf, 16v pcc1898ct-nd digikey 3 c5, c6 2 1206 0.33uf, 25v pcc1889ct-nd digikey 4 c7, c8, c20, r15, r16 5 0805 open open 5 c16, c17, c18, c19 5 0805 10nf pcc103bnct-nd digikey 6 c9, c21, c22 3 0805 47nf pcc1836ct-nd digikey 7 c10, c12, c14, c15 4 1206 0.1uf pcc2239ct-nd digikey 8 c11, c13 2 0805 0.1uf pcc1840ct-nd digikey 9 d1, d2, d3, d4 4 sod-123 1n4148 1n4148wdict-nd digikey 10 d5, d6 2 smb mura120t30sct mura120t3osct-nd digikey 11 ds2 1 led 160-1414-1 160-1414-1-nd digikey 12 j1 2 con eisa31 con eisa31 a26568-nd digikey 13 j2 2 con_power con_power a26570-nd digikey 14 q1 1 sot23-bce mmbt 3904 mmbt3904dict-nd digikey 15 q2, q7 2 sot23-bce mm bt5401 mmbt5401dict-nd digikey 16 q3, q4, q5, q6 4 directfet irf6645 irf6645 ir 17 r1, r2 2 0805 0r p0.0act-nd digikey 18 r3, r4 2 0805 100r p100act-nd digikey 19 r5, r6 2 0805 3.3k p3.3kact-nd digikey 20 r7, r8 2 0805 10.0k ,1% p10.0kcct-nd digikey 21 r9, r10 2 0805 10r p10act-nd digikey 22 r11, r31, r33, r35, r40, r41 6 0805 100k p100kact-nd digikey 23 r12 1 0805 4.7k p4.7kact-nd digikey 24 r13, r14 2 0805 8.2k p8.2kact-nd digikey 25 r17, r18 2 0805 1.74k,1% p1.74kcct-nd digikey 26 r19, r20 2 0805 1.30k, 1% p1.30kcct-nd digikey 27 r21, r22, r24, r39 4 0805 1k p1.0kact-nd digikey 28 r23, r26, r27, r28, r29, r30 6 0805 4.7r p4.7act-nd digikey 29 r25, r32 2 0805 47k p47kact-nd digikey 30 r36 1 0805 10k p10kact-nd digikey 31 r37, r38 2 0805 1r p1.0act-nd digikey 32 rp1, rp2 2 0805 100c 594-2322-675-21007 mouser 33 tp1, tp2 2 tp tp open 34 u1, u2 2 so-14 irs20124s irs20124s ir
www.irf.com 29 IRAUDAMP3 pcb specifications motherboard: material: fr4, ul 125 c layer stack: 1 layer, 2 oz. cu dimensions: 5.014? x 13.685? x 0.062? solder mask: lpi solder mask, smobc on top and bottom layers plating: open copper solder finish silkscreen: on top and bottom layers daughter-board layer stack daughter-board: material: fr4, ul 125 c layer stack: 2 layers, 2 oz. cu each, through-hole plated dimensions: 3.127? x 1.492? x 0.062? solder mask: lpi solder mask, smobc on top and bottom layers (black) plating: open copper solder finish silkscreen: on top and bottom layers (red)
www.irf.com 30 IRAUDAMP3 pcb layers motherboard: bottom layer and pads (1 of 2)
www.irf.com 31 bottom layer and pads (2 of 2)
www.irf.com 32 bottom-side solder-mask and silkscreen (1 of 2)
www.irf.com 33 bottom-side solder-mask and silkscreen (2 of 2)
www.irf.com 34 top-side solder-mask and silkscreen (1 of 2) 4.0
www.irf.com 35
www.irf.com 36 top-side solder-mask and silkscreen (2 of 2) daughter board: pcb layout ? top layer and pads pcb layout ? top-side so lder-mask and silkscreen
www.irf.com 37 pcb layout ? bottom layer and pads pcb layout ? bottom-side solder-mask and silkscreen 4.0
www.irf.com 38 IRAUDAMP3 mechanical construction motherboard 4.0
www.irf.com 39 top and bottom sides of motherboard showing component locations daughter board top side showing component locations bottom side showing connector locations patent and trademark notice ir?s proprietary directfet ? technology is covered by us patents 6624522, 6784540 and multiple other us and foreign pending patent applications. ir ? , hexfet ? and directfet ? are registered trademarks of international rectifier corporation. all other product names noted herein may be trademarks of their respective holders. 4.0

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