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2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page1 pt5301_ds rev en_1.3 pt5301 general description the pt5301 is an audio power amplifier mainly designed for applications in mobile phones and other portable communication device applications. it is capable of delivering 1.25 watts of continuous average power to an 8 ? load and 2 watts of continuous average power to a 4 ? load with less than 1% distortion (thd+n) from a 5v power supply. the pt5301 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. the pt5301 features a low-power shutdown mode and improved pop & click circuitry that attenuates noise which would otherwise occur during turn on and turn off transactions. the pt5301 is delivered with miniature msop-8, dfn-8 and smd-9 packages (pd free). application z mobil phones z pdas z portable electronic devices features z low distortion 0.50w @ vdd=5.0v, r l =8 ? thd+n = 0.03% 0.25w @ vdd=3.0v, r l =8 ? thd+n = 0.04% 0.15w @ vdd=2.6v, r l =8 ? thd+n = 0.05% z output power @ 1% thd+n 1.25w @ vdd=5.0v, rl=8 ? 2.0w @ vdd=5.0v, rl=4 ? 0.425w @ vdd=3.0v, r l =8 ? 0.60w @ vdd=3.0v, r l =4 ? 0.30w @ vdd=2.6v, r l =8 ? 0.40w @ vdd=2.6v, r l =4 ? z ultra low shutdown current z improved pop & click noise eliminating function z no need for output coupling or bootstrap capacitors z 2.2 -5.5v operation supply voltage z thermal protection z external gain configuration capability z pd free msop-8, dfn-8, and smd-9 packages z unity-gain stable ordering information pd-free package temperature order part number transport media marking msop-8 -40 o c to 85 o c pt5301emso tape and reel pt5301 xxxxxc smd-9 -40 o c to 85 o c PT5301ESMD tape and reel p5301 xxxxx dfn-8 -40 o c to 85 o c pt5301eqfn tape and reel pt5301 xxxxxc typical application key performance chart 8 vo 1 vo bia 20k 20 k + + -i +i b yp ass shutdown vd gnd shutdown c b 1 f c s 1 c i 0.39 r i 20k figure 1. typical audio amplifier application circuit. 10 100 1000 3000 0.01 0.1 1 10 vdd=5.0v,rl=4.0ohm, f=1khz thd+n vs output power output power (mw) thd+n(%)
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page2 pt5301_ds rev en_1.3 pt5301 pin assignment pin descriptions absolute maximum ratings (note 1 ) items value unit supply voltage 6 v input voltage -0.3 vdd+0.3 v thermal resistance, msop8: ja / jc 190/56 /w thermal resistance, smd9: ja (note 3) 180 /w power dissipation (notes 5, 6) internal limited operating temperature -40 to 85 esd susceptibility (note 4) 2500 v storage temperature -65 to 150 package lead soldering temperature 260 , 10s recommended operating range (note 2) symbol parameter value t a temperature range -40c t a 85c v dd supply voltage 2.2v v dd 5.5v note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. note 2: operating ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. note 3: all bumps have the thermal resistance and contribute equally when used to lower thermal resistance. all bumps must connected to achiev e specified thermal resistance note 4: human body model, 100pf discharged through a 1.5k ? resistor. msop8/ dfn8 smd9 names description 1 c3 shutdown turn-on or turn-off the chip 2 c1 bypass set the common voltage 3 a3 +in the non-inverting input node 4 a1 -in the inverting input node 5 a2 vo1 the 1 st node of outputs 6 b3 vdd power supply 2.5~5.5v 7 b1, b2 gnd ground 8 c2 vo2 the 2 nd node of outputs 1 2 3 4 shutdown bypass -in +in vo 2 vo1 gnd vdd 8 7 6 5 msop8/dfn8 top view a -in gnd vo1 b gnd +in c vdd bypass 1 vo2 2 shutdown 3 smd9 top view
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page3 pt5301_ds rev en_1.3 pt5301 note 5: the maximum power dissipation must be derated at elevated temperatures and is dictated by t jmax , ja , and the ambient temperature t a . the maximum allowable power dissipation is p dmax = (t jmax ?t a )/ ja or the number given in absolute maximum ratings, whichever is lower. for the pt5301, see power derating curves for additional information. note 6: maximum power dissipation in the device (p dmax ) occurs at an output power level significantly below full output power. p dmax can be calculated using equation 1 shown in the application information section. it may also be obtained from the power dissipation graphs. electrical characteristics vdd = 5v (notes 7, 8) the following specifications apply for the circuit shown in figure 1, unless otherwise specified. ta = 25 ? c. symbol items conditions typ limit units v in =0v,i o =0a,no load 2.9 4.5 ma i dd quiescent power supply current v in =0v,i o =0a, 8 ? load 2.9 5 ma i sd shutdown current v shutdown =0 (note 9) 0.1 2 ua v sdih shutdown voltage input high 1.6 v v sdil shutdown voltage input low 1.4 v v os output offset voltage 1.3 50 mv output power (8 ? load) f=1k; thd+n=1% (max) 1.25 0.9 w po output power (4 ? load) f=1k; thd+n=1% (max) 2 w t wu wake-up time 146 ms thd total harmonic distortion + noise po=0.5wrms; f=1k, 8 ? load 0.03 % input float, v ripple =200mv sine wave p-p 90 (f=217hz), 79 (f=1k) psrr power supply rejection ratio input terminated with 10 ? , v ripple =200mv sine wave p-p 71 (f=217hz), 69 (f=1k) 57 (min) db 9.7 k ? (min) ro resistor output to gnd(note 10) 11.0 12.5 k ? (max)
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page4 pt5301_ds rev en_1.3 pt5301 electrical characteristics v dd = 3v (notes 7, 8) the following specifications apply for the circuit shown in figure 1, unless otherwise specified. ta = 25 ? c. symbol items conditions typical limit units v in =0v, io=0a, no load 2.8 4.3 ma i dd quiescent power supply current v in =0v, io=0a, 8 ? load 2.8 5 ma i sd shutdown current v shutdown =0 (note 9) 0.1 2 ua v sdih shutdown voltage input high 1.1 v v sdil shutdown voltage input low 1.0 v v os output offset voltage 1.3 50 mv output power (8 ? load) f=1k;thd+n=1%(max) 425 mw po output power (4 ? load) f=1k;thd+n=1% (max) 600 mw t wu wake-up time 150 ms thd total harmonic distortion + ni po=0.25wrms;f=1k,8 ? ld 0.04 % input float, v ripple =200mv sine wave p-p 88 (f=217), 79 (f=1k) psrr power supply rejection ratio input terminated with 10 ? , v ripple =200mv sine wave p-p 67 (f=217), 68 (f=1k) 55 (min) db 9.7 k ? (min) ro resistor output to gnd(note 10) 11.0 12.5 k ? (max) electrical characteristics v dd = 2.6v (notes 7, 8) the following specifications apply for the circuit shown in figure 1, unless otherwise specified. ta = 25 ? c. symbol items conditions typical limit units v in =0v, io=0a, no load 2.8 4.3 ma i dd quiescent power supply current v in =0v, io=0a, 8 ? load 2.8 5 ma i sd shutdown current v shutdown =0 (note 9) 0.1 2 ua v sdih shutdown voltage input high 1 v v sdil shutdown voltage input low 0.9 v v os output offset voltage 1.3 50 mv output power (8 ? load) f=1k;thd+n=1%(max) 300 mw po output power (4 ? load) f=1k;thd+n=1% (max) 400 mw
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page5 pt5301_ds rev en_1.3 pt5301 electrical characteristics v dd = 2.6v (continued) (notes 7, 8) the following specifications apply for the circuit shown in figure 1, unless otherwise specified. ta = 25 ? c. symbol items conditions typical limit units t wu wake-up time 153 ms thd total harmonic distortion + noise po=0.15wrms; f=1k, 8 ? load 0.05 % psrr power supply rejection ratio input terminated with 10 ? , v 200 v i 66 (f=217), 68 (f=1k) db 9.7 k ? (min) ro resistor output to gnd (note 10) 11.0 12.5 k ? (max) note 7: electrical characteristics state dc and ac electrical specifications unde r particular test conditions which guarantee specific performance limits. this assumes that th e device is within the operating ratings. specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. note 8: ?typical? means that measured at 25 ? c and represent the parametric norm. ?limit? indicates that are guaranteed by powtech?s quality control standards. datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. note 9: for micro smd package, shutdown cu rrent is measured in a normal room environment. exposure to direct sunlight will increase isd by a maximum of 2a. note 10: r o is measured from the output pin to ground. this value represents the parallel combination of the 15k ? output resistors and the two 20k ? resistors. external components description 8 vo1 vo2 bias 20k 20k + + -in +in bypass shutdown vdd gnd shutdown c b 1 f c s 1 f c i 0.39 f r f 20k r i 20k control figure 1. typical audio amplifier application circuit.
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page6 pt5301_ds rev en_1.3 pt5301 components functional description 1 r i inverting input resistor that sets the closed-loop gain together with r f . this resistor also performs as a high pass filter with c i at f c = 1/(2 r i c i ) 2 c i input coupling capacitor which blocks the dc voltage at the input terminals. it also creates a high pass filter with r i at f c = 1/(2 r i c i ). for more details of how to determine the value of c i , look at the section of proper selection of external components . 3 r f feedback resistor which sets the closed-loop gain together with r f . 4 c s supply bypass capacitor which provides supply voltage filtering. for more details of how to determine the value of c b , refer to the section of power supply bypassing . 5 c b bypass pin capacitor which provides half-supply filtering. for more details of how to determine the value of c b , look at the section of proper selection of external components . typical ferformance characteristics 100 1000 10000 0.01 0.1 1 10 thd+n(%) vdd=5.0v,rl=4.0ohm,po=1w thd+n vs frequency frequency(hz) 10 100 1000 3000 0.01 0.1 1 10 vdd=5.0v,rl=4.0ohm,f=1khz thd+n vs output power output power (mw) thd+n(%) 20 100 1000 10000 20000 0.01 0.1 1 10 vdd=5. 0v, rl=8. 0ohm, po=500mw thd+n vs fre q uenc y thd+n(%) frequency(hz) 20 100 1000 10000 20000 0.01 0.1 1 10 thd+n vs frequency frequency(hz) thd+n(%) vdd=3. 0v, rl=8. 0ohm,po=250mw thd+n vs frequency
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page7 pt5301_ds rev en_1.3 pt5301 typical ferformance char acteristics (continued) 20 100 1000 10000 20000 0.01 0.1 1 10 frequency(hz) thd+n(%) vdd=2. 6v, rl=8. 0ohm, po=150mw thd+n vs frequency thd+n vs frequency vdd=2.6v,rl=4,po=150mw 0.01 0.1 1 10 100 1000 10000 100000 f(hz) thd(%) 10 100 1000 3000 0.0016 0.01 0.1 1 10 thd+n(%) output power(mw) thd+n vs out p ut pow e r vdd=5.0v,rl=8.0 ohm,f=1khz thd+n vs fre que ncy vdd=3v, rl=4 ? , and po=500mw 0.01 0.1 1 10 100 1000 10000 100000 f(hz) thd(%) thd+n vs output powe r vdd=3v,rl=4 ? ,and f=1khz 0.01 0.1 1 10 10 100 1000 output power(mw) thd(%) 10 100 1000 0.0016 0.01 0.1 1 10 thd+n(%) output power(mw) thd+n vs output power vdd=3.0v,rl=8.0 ohm,f=1khz
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page8 pt5301_ds rev en_1.3 pt5301 typical ferformance char acteristics (continued) thd+n vs ouput powe r vdd=2.6v, rl=4 ? ,f=1khz 0.01 0.1 1 10 10 100 1000 output power(mw) thd(%) 10 100 500 0.01 0.1 1 10 vdd=2.6v,rl=8.0ohm,f=1khz thd+n(%) output power(mw) thd+n vs output power 20 100 1000 10000 20000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 psrr(db) frequency(hz) psrr vs frequenc y vdd=5.0v,rl=8.0ohm,input to gnd 20 100 1000 10000 20000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 psrr(db) frequency(hz) psrr vs frequency vdd=3.0v,rl=8.0ohm,input to gnd 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 psrr(db) frequency(hz) psrr vs fre q uenc y vdd=2.6v,rl=8.0ohm,input to gnd 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.42.5 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 power dissipation(w) output power(w) 4ohm 8ohm power dissipation vs output power v dd =5.0v
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page9 pt5301_ds rev en_1.3 pt5301 typical ferformance char acteristics (continued) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 power dissipation(w) output power(w) 4ohm 8ohm power dissipation vs output power v dd =3.0v 0.0 0.2 0.4 0.6 0.8 1.0 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 power dissipation(w) output power(w) 4ohm 8ohm power dissipation vs output power v dd =2.6v 100 1000 10000 100000 -100 -90 -80 -70 -60 -50 -40 -30 psrr (db) frequency (hz) psrr vs frequency vdd=5.0v,rl=8ohm,input float 100 1000 10000 100000 -100 -90 -80 -70 -60 -50 -40 -30 psrr (db) frequency (hz) psrr vs frequency vdd=3.0v,rl=8ohm,input float 20 100 1000 10000 20000 20 25 30 35 40 45 50 55 60 noise floor vdd=5.0v,rl=8.0ohm input to gnd output noise voltage(uv) frequency(hz)
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page10 pt5301_ds rev en_1.3 pt5301 application information bridge configuration explanation as shown in figure1, the pt5301 has two internal operational amplifiers. the first amplifier?s gain is externally configurable, while the second amplifier is internally fixed in a unity-gain, inverting configuration. the closed-loop gain of the first amplifier is set by selecting the ratio of r f to r i while the second amplifier?s gain is fixed by the two internal 20k ? resistors. figure1 shows that the output of amplifier one serves as the input to amplifier two which results in both amplifiers producing signals identical in magnitude, but out of phase by 180 ? . consequently, the differential gain for the ic is a vd = 2 *(r f /r i ) by driving the load differentially through outputs vo1 and vo2, an amplifier configuration commonly referred to as ?bridged mode? is established. bridged mode operation is different from the classical single-ended amplifier configuration where one side of the load is connected to ground. a bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides differential drive to the load, thus doubling output swing for a specified supply voltage. four times the output power is possible as compared to a single-ended amplifier under the same c onditions. this increase in attainable output power assumes that the amplifier is not current limited or clipped. in order to choose an amplifier?s closed-loop gain without causing excessive clipping, please refer to the audio power amplifier design section. a bridge configuration, such as the one used in pt5301, also creates a second ad vantage over single-ended amplifiers. since the differential outputs, vo1 and vo2, are biased at half-supply, no net dc voltage exists across the load. this eliminates the need for an output coupling capacitor which is required in a single supply, single-ended amplifier configuration. without an output coupling capacitor, the half-s upply bias across the load would result in both increased internal ic power dissipation and also possible loudspeaker damage. power dissipation power dissipation is a major concern when designing a successful amplifier, whether the amplifier is bridged or single-ended. a direct consequence of the increased power delivered to the load by a bridge amplifier is an increase in internal power dissipation. since the pt5301 has two operational amplifiers in one package, the maximum internal power dissipation is 4 times that of a single-ended amplifier. the maximum power dissipation for a given application can be derived from the power dissipation graphs or from equation 1. p dmax = 4*(v dd ) 2 /(2 2 r l ) (1) it is critical that the maximum junction temperature t jmax of 150 ? c is not exceeded. t jmax can be determined from the power derating curves by using p dmax and the pc board foil area. by adding copper foil, the thermal resistance of the application can be reduced from the free air value of ja , resulting in higher p dmax values without thermal shutdown protection circuitry being activated. additional copper foil can be added to any of the leads connected to the pt5301. it is especially effective when connected to v dd , gnd, and the output pins. if t jmax still exceeds 150 ? c, then additional changes must be made. these changes can include reduced supply voltage, higher load impedance, or reduced ambient temper ature. internal power dissipation is a function of output power. refer to the typical performance characteristics curves for power dissipation information for different output powers and output loading. power supply bypassing as with any amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. the capacitor location on both the bypass and power supply pins should be as close to the device as possible. typical applications employ a 5v regulator with 10f tantalum or electrolytic capacitor and a ceramic bypass capacitor which aid in supply stability. this does not eliminate the need for bypassing the supply nodes of the pt5301. the selection of a bypass capacitor, especially c b , is dependent upon psrr requirements, click and pop performance (as explained in the section, proper selection of external components ), system cost, and size constraints. shutdown function in order to reduce power consumption while not in use, the pt5301 contains shutdown circuitry that is used to turn off the amplifier?s bias circuitry whenever the shutdown pin is put at logical ?low?. while the device may be disabled with shutdown voltages in between ground and supply, the idle current may be greater than the typical value of 0.1a. therefore, the shutdown pin should be tied to a definite voltage to avoid unwanted state changes. in many applications, a microcontroller or
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page11 pt5301_ds rev en_1.3 pt5301 microprocessor output is used to control the shutdown circuitry, which provides a quick, smooth transition to shutdown. another solution is to use a single-throw switch in conjunction with an external pull-up resistor (or pull-down, depending on shutdown high or low application). this scheme gu arantees that the shutdown pin will not float, thus preventing unwanted state changes. proper selection of external components proper selection of external components in applications using integrated power amplifiers is critical to optimize device and system performance. while the pt5301 is tolerant of external component combinations, consideration to component values must be used to maximize overall system quality. the pt5301 is unity-gain stable which gives the designer maximum system flexibility. the pt5301 should be used in low gain configurations to minimize thd+n+n values, and maximize the signal to noise ratio. low gain configurations require large input signals to obtain a given output power. input signals equal to or greater than 1vrms are available from sources such as audio codecs. please refer to the section, audio power amplifier design , for a more complete explanation of proper gain selection. besides gain, one of the major considerations is the closed loop bandwidth of the amplifier. to a large extent, the bandwidth is dictated by the choice of external components shown in figure1 . the input coupling capacitor, c i , forms a first order high pass filter which limits low frequency response. this value should be chosen based on needed frequency response for a few distinct reasons. large input capacitors are both expensive and space hungry for portable designs. clearly, a certain sized capacitor is needed to couple in low frequencies without severe attenuation. but in many cases the speakers used in portable systems, whether internal or external, have little ability to reproduce signals below 100hz to 150hz. thus, using a large input capacitor may not increase actual system performance. in addition to system cost and size, click and pop performance is effected by the size of the input coupling capacitor, i. a larg er input coupling capacitor requires more charge to reach its quiescent dc voltage (nominally 1/2 vdd). this charge comes from the output via the feedback and is apt to create pops upon device enable. thus, by minimizing the capacitor size based on necessary low frequency response, turn-on pops can be minimized. besides minimizing the input capacitor size, careful consideration should be paid to the bypass capacitor value. bypass capacitor, c b , is the most critical component to minimize turn-on pops since it determines how fast the pt5301 turns on. the slower the pt5301?s outputs ramp to their quiescent dc voltage (nominally 1/2 v dd ), the smaller the turn-on pop. choosing c b equal to 1.0f along with a small value of c i (in the range of 0.1f to 0.39f), should produce a virtually pop & click free shutdown function. while the device will function properly, (no oscillations or motorboating), with c b equal to 0.1f, the device will be much more susceptible to turn-on clicks and pops. thus, a value of c b equal to 1.0f is recommended in all but the most cost sensitive designs. audio power amplifier design a 1w/8 audio amplifier given: power output 1wrms load impedance 8 ? input level 1vrms input impedance 20k ? bandwidth 100hz?20khz 0.25db 5v is a standard voltage in most applications, it is chosen for the supply rail. extra supply voltage creates headroom that allows the pt5301 to reproduce peaks in excess of 1w without producing audible distortion. at this time, the designer must make sure that the power supply choice along with the output impedance does not violate the conditions explained in the power dissipation section. once the power dissipation equations have been addressed, the required differential gain can be determined from equation 2. ( ) inrms orms in l o vd v v v p p a / ) /( = = 2 / / vd i f a r r = from equation 2, the minimum a vd is 2.83; use a vd =3. since the desired input impedance was 20k ? , and with an a vd impedance of 2, a ratio of 1.5:1 of r f to r i results in an allocation of r i = 20k ? and r f = 30k ? . the final design step is to address the bandwidth requirements which must be stated as a pair of ? 3db frequency points. five times away from a ? 3db point is 0.17db down from passband response which is better than the required 0.25db specified. f l = 100hz/5 = 20hz f h = 20khz 5= 100khz (2)
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page12 pt5301_ds rev en_1.3 pt5301 as mentioned in the external components section, r i in conjunction with ci create a high-pass filter. c i 1/(2 20k ? 20hz) = 0.397f; use 0.39f the high frequency pole is determined by the product of the desired frequency pole, f h , and the differential gain, a vd . with an a vd = 3 and f h = 100khz, the resulting gbwp = 300khz which is much smaller than the pt5301 gbwp of 2.0mhz. this figure displays that if a designer has a need to design an amplifier with a higher differential gain, the pt5301 can still be used without running into bandwidth limitations. the pt5301 is unity gain stable and requires no external components besides gain-setting resistors, an input coupling capacitor, and proper supply bypass in the typical application. however, if a closed-loop gain is much greater than the norm al setting value (i.e. gain = 10), a feedback capacitor (c 4 ) may be required as shown in figure 2. to limit the bandwidth of the amplifier. the feedback capacitor creates a low pass filter that eliminates the possible high frequency oscillations. be aware that an possible inadequate combination of r3 and c4 will cause roll-off before 20khz. a typical combination is r 3 = 20k and c 4 = 25pf. users could refer this combination when design a high gain audio amplifier. 8 vo1 vo2 bias 20k 20k + + -in +in bypass shutdown vdd gnd c 3 1 f c 1 1 f c 2 0.39 f r 3 r 2 20k figure 2. high gain audio amplifier c 4 r 1 100k 8 vo1 vo2 bias 20k 20k + + -in +in bypass shutdown vdd gnd c 3 1 f c 1 1 f c 2 0.39 f r 3 20k r 2 20k figure 3. fully-differential application for pt5301 r 1 100k c 4 0.39 f r 5 20k r 6 20k
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page13 pt5301_ds rev en_1.3 pt5301 thermal considerations for driving 4 ? ? load when driving 4 ? load, the internal power dissipation of the pt5301 must be carefully considerated. failing to optimize thermal design may compromise the pt5301?s high power performance and activate unwanted, though necessary, thermal protection. in all circumstances and conditions, the junction temperature must be held below 150c to prevent activating the pt5301?s thermal protection. the maximum allowable power dissipation is limited by thermal resistance of the package. when the supply voltage is higher than 4v, the pt5301?s msop or smd package isn?t recommended to drive 4 ? ? load. the pt5301?s exposed-pad qfn package provides a low thermal resistance between the die and the pcb to which the part is mounted and soldered. this allows rapid heat transfer from th e die to the surrounding pcb copper traces, ground plane and, finally, surrounding air. the result is a low vo ltage audio power amplifier that produces 2w at 1% thd with a 4 load. this high power is achieved through careful consideration of necessary thermal design. the qfn package must have its exposed-pad soldered to a copper pad on the pcb. the exposed-pad?s pcb copper pad is connected to a large plane of continuous unbroken copper. this plane forms a thermal mass and heat sink and radiation area. place the heat sink area on either outside plane in the case of a two-sided pcb, or on an inner layer of a board with more than two layers. connect the exposed-pad?s copper pad to the inner layer or backside copper heat sink area with several vias. ensure efficient thermal conductivity by plating through and solder-filling the vias. best thermal performance is achieved with the largest practical copper heat sink area. pcb layout and supply regulation considerations for driving 4 ? ? load power dissipated by a load is a function of the voltage swing across the load and the load?s impedance. as load impedance decreases, load dissipation becomes increasingly dependent on the interconnect (pcb trace and wire) resistance between the amplifier output pins and the load?s connections . residual trace resistance causes a voltage drop, which results in power dissipated in the trace and not in the load as desired. for example, 0.1 trace resistance reduces the output power dissipated by a 4 load from 2.0w to 1.9w. this problem of decreased load dissipation is exacerbated as load impedance decreases. therefore, to maintain the highest load dissipation and widest output voltage swing, pcb traces that connect the output pins to a load must be as wide as possible. poor power supply regulation adversely affects maximum output power. a poorly regulated supply?s output voltage decreases with increasing load current. reduced supply voltage causes decreased headroom, output signal clipping, and reduced output power. even with tightly regulated supplie s, trace resistance creates the same effects as poor supply regulation. therefore, making the power supply traces as wide as possible helps maintain full output voltage swing
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page14 pt5301_ds rev en_1.3 pt5301 package information smd9 package millimeters symbol min max a 0.635 0.735 a1 0.209 0.249 a2 0.426 0.486 b 0.25 0.35 d 1.47 1.53 e 1.47 1.53 e 0.50 bsc pin a1 d e b e e a1 a2 a
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page15 pt5301_ds rev en_1.3 pt5301 package information msop8 package millimeters inches symbol min max min max a 0.820 1.100 0.032 0.043 a1 0.020 0.150 0.001 0.006 a2 0.750 0.950 0.030 0.037 b 0.250 0.380 0.010 0.015 c 0.090 0.230 0.004 0.009 d 2.900 3.100 0.114 0.122 e 0.650(bsc) 0.026(bsc) e 2.900 3.100 0.114 0.122 e1 4.750 5.050 0.187 0.199 l 0.400 0.800 0.016 0.031 0 6 0 6 e c a2 a d b
2 watts audio power amplifier china resources powtech (shanghai) limited www.crpowtech.com page16 pt5301_ds rev en_1.3 pt5301 package information dfn8 package

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