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mp7742 2 x 15w class d stereo single ended audio amplifer mp7742 rev. 0.91 www.monolithicpower.com 1 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the mp7742 is a stereo 2 x 15w class d audio amplifier. it is one of mps? products of fully integrated audio amplifiers which dramatically reduces solution size by integrating the following: 250m ? power mosfets startup / shutdown pop elimination short circuit protection circuits the mp7742 utilizes a single ended output structure capable of delivering 15w per channel into 4 ? speakers. mps class d audio amplifiers exhibit the high fidelity of a class a/b amplifier at high efficiencies. the circuit is based on the mps? proprietary variable frequency topology that delivers excellent linearity, fast response time and operates on a single power supply. features ? 2 x 15w output at v dd = 24v into a 4 ? load ? thd+n = 0.03% at 4w, 8 ? ? 90% efficiency at 15w & v dd = 24v ? low noise (103v typical) ? switching frequency up to 1mhz ? 9.5v to 28v operation from a single supply ? integrated startup and shutdown pop elimination circuit ? thermal and short circuit protection ? integrated power fets ? pin compatible with mp7722 ? available in tssop20-exposed package applications ? flat panel tv ? portable docking stations ? surround sound dvd systems ? televisions ? multimedia computers ? home stereo systems ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. aam (analog adaptive modulation) is a trademark of monolithic power systems, inc. typical application mp7742 bs1 sw1 bs2 sw2 ref1 ch1 input v dd v dd ch1 output ch2 output in1 ref2 in2 en2 en1 agnd2 agnd1 pgnd2 pgnd1 vdd2 ch2 input en/shdn vdd1 v dd 2 18 17 19 12 14 13 3 8 7 6 10 4, 5 9 20 15 thd+n vs. p out v dd =24v, freq=1khz, a-wtd thd+n (%) 0.1 0.2 0.5 1 2 5 10 20 0.01 0.02 0.05 p out (w) 20 0.1 1 10
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 2 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. package reference 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 part number* package MP7742DF tssop20f temperature top marking ?40 c to +85 c MP7742DF * for tape & reel, add suffix ?z (e.g. MP7742DF?z) for lead free, add suffix ?lf (e.g. MP7742DF?lf?z) absolute maxi mum ratings (1) supply voltage v dd ...................................... 32v bs voltage.................. v sw ? 0.3v to v sw + 6.5v enable voltage v en ........................ ?0.3v to +6v v sw ................... ?1v (-5v for <10ns) to v dd + 1v v pin , v nin ................................... ?1v to v dd + 1v agnd to pgnd .......................... ?0.3v to +0.3v junction temperature............................... 150 c lead temperature ....................................260 c storage temperature ..............?65 c to +150 c recommended operating conditions (2) supply voltage v dd .......................... 9.5v to 28v operating temperature t a .........?40 c to +85 c thermal resistance (3) ja jc tssop20f ............................. 40 ....... 6......... c notes: 1) exceeding these ratings may damage the device. 2) the device is not guaranteed to function outside of its operating conditions. 3) measured on jesd5 1-7, 4-layer pcb.. electrical characteristics (4, 5) v dd = 24v, v en = 5v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units supply current standby current v en = 0v 40 100 a quiescent current sw=0v 3 6 ma output drivers sw on resistance sourcing and sinking 0.25 ? short circuit current sourcing and sinking 4.5 a inputs ref1/2, in1/2, input common mode voltage range 0 v dd 2 v dd ? 1.5 v ref1/2, in1/2, input current v pin = v nin = 12v 1 5 a v en rising 1.8 2.5 v en enable threshold voltage v en falling 0.8 1.2 v en enable input current v en = 5v 1 a thermal shutdown thermal shutdown trip point t j rising 150 c thermal shutdown hysteresis 30 c note: 4) the device is not guaranteed to function outside its operating rating. 5) electrical characteristics are for the ic only wi th no external components except bypass capacitors.
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 3 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. operating specifications (6) circuit of figure 1, v dd = 24v, v en = 5v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units standby current v en = 0v 260 a quiescent current 26 ma f = 1khz, thd+n = 10%, 4 ? load 15 w power output f = 1khz, thd+n = 10%, 8 ? load 8 w p out = 1w, f = 1khz, 4 ? load 0.07 % thd+ noise p out = 1w, f = 1khz, 8 ? load 0.04 % f = 1khz, p out = 15w, 4 ? load 90 % efficiency f = 1khz, p out = 8w, 8 ? load 90 % maximum power bandwidth 20 khz dynamic range 97 db noise floor a-weighted 103 v f = 217hz -55 db power supply rejection v ripple =200mv pp c r =100f f = 1khz -58 db note: 6) operating specifications are for the ic in typical application circuit (figure 1).
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 4 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pin functions pin # name description 1, 11, 16 nc no connect. not internally connected 2 ref1 amplifier 1 reference. ref1 is the refer ence point for amplifier 1. use a resistive voltage divider to set the voltage at ref1 to v dd /2. 3 in1 amplifier 1 input. in1 is the inverting input for amplifier 1. 4, 5 agnd1 analog ground 1. connect agnd1 to agnd2. 6 en1 enable input 1. en1 must be connected to en2. drive en1 high to enable mp7742; low to disable it. 7 in2 amplifier 2 input. in2 is the inverting input for amplifier 2. 8 ref2 amplifier 2 reference. ref2 is the refer ence point for amplifier 2. use a resistive voltage divider to set the voltage at ref2 to v dd /2. 9 agnd2 analog ground 2. connect agnd2 to agnd1. 10 en2 enable input 2. en2 must be connected to en 1. drive high to enable mp7742, drive low to disable. 12 bs2 high-side mosfet bootstrap input for amplifie r 2. a capacitor from bs2 to sw2 supplies the gate drive current to the internal high-side mosfet. connect a 0.1f~1f capacitor from sw2 to bs2. 13 vdd2 power supply input. bypass vdd2 to pgnd2 with a 1f x7r capacitor (in addition to the main bulk capacitor), placed close to the ic pin13 and pin15. 14 sw2 switched power output. sw2 is the output of amplifier 2. connect the lc filter to this pin. 15 pgnd2 power ground for amplifier 2. connect pgnd2 to pgnd1. 17 bs1 high-side mosfet bootstrap input for amp lifier 1. a capacitor from bs1 to sw1 supplies the gate drive current to the internal high-side mosfet. connect a 0.1f~1f capacitor from sw1 to bs1. see figure 1. 18 vdd1 power supply input. bypass vdd1 to pgnd1 with a 1f x7r capacitor (in addition to the main bulk capacitor), placed close to the ic pin18 and pin20. 19 sw1 switched power output. sw1 is the output of amplifier 1. connect the lc filter to this pin. see figure 1. 20 pgnd1 power ground for amplifier 1. connect pgnd1 to pgnd2. see figure 1. exposed pad connect exposed pad to gnd plane for proper thermal performance.
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 5 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performance curves circuit of figure 1, v dd =24v, v en =5v, t a = +25 c, unless otherwise noted. thd+n vs. frequency thd+n (%) amplitude (dbr) amplitude (dbr) amplitude (dbv) -10 -8 -6 -4 -2 0 +2 +4 -10 -8 -6 -4 -2 0 +2 +4 thd+n (%) 0.1 0.2 0.5 1 2 5 10 20 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 20 0.01 0.02 0.05 0.1 0.2 0.5 0.2 0.5 1 2 5 2 5 10 20 0.01 0.02 0.05 0.02 0.05 thd+n (%) thd+n (%) 0.1 1 10 20 0.006 p out (w) frequency (hz) , input ac-grounded 100 20 20 20 20 1k 10k 20k 100 20 1k 10k 20k frequency (hz) 100 1k 10k 20k frequency (hz) 100 1k 10k 40k frequency (hz) frequency (khz) 100 1k 10k 40k 2 -120 -100 -80 -60 -40 -20 0 4 6 8 10 12 14 16 18 20 p out (w) thd+n vs. frequency frequency response frequency response fft noise floor frequency (hz) amplitude (db) power supply rejection ratio fft noise floor amplitude (dbv) -120 -100 -80 -60 -40 -20 0 frequency (khz) 24 6 8 10 12 14 16 18 20 20 0.1 1 10 20 0.1 1 10 freq=10khz freq=100hz freq=1khz freq=10khz freq=1khz freq=100hz -80 +0 -60 -40 -20 -
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 6 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performance curves (continued) circuit of figure 1, v dd =24v, v en =5v, t a = +25 c, unless otherwise noted. cross talk cross talk ihf-imd test tones: 19 khz and 20 khz test tones: 19 khz and 20 khz ihf-imd p out vs. v dd thermal rise vs. p out v dd =24v efficiency vs. p out input signal freq=1khz p out (w) 100 20 20 1k 10k 20k frequency (hz) v dd (v) 100 1k 10k 20k 100 1k 10k 30k amplitude (dbv) -120 -100 -80 -60 -40 -20 0 amplitude (dbv) -120 -100 -80 -60 -40 -20 0 amplitude (db) amplitude (db) -120 -100 -80 -60 -40 -20 0 -120 -100 -80 -60 -40 -20 0 frequency (hz) frequency (hz) 100 1k 10k 20k frequency (hz) 0 0 5 10 15 20 25 510 15 20 25 30 35 p out (w) p out per channel (w) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 v dd =24v,input signal freq=1khz 2 0 4 6 8 10 12 14 16 18 10 30 50 70 90 110 130 150 0 3 6 9 12 15 18 case temperature (c) left to right left to right right to left right to left
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 7 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. operation the mp7742 is a single-ended class d audio amplifier. it uses the monolithic power systems patented analog adaptive modulation tm to convert the audio input signal into pulses. these pulses drive an internal high-current output stage and, when filtered through an external inductor-capacitor filter, reproduce the input signal across the load. because of the switching class d output stage, power dissipation in the amplifier is drastically reduced when compared to class a, b or a/b amplifiers while maintaining high fidelity and low distortion. the amplifier uses differential input to the modulator. pin is the positive input and nin is the negative input. the common mode voltage of the input is set to half the dc power supply input voltage (v dd /2) through the resistive voltage divider. the input capacitor c in couple the ac signal at the input. the amplifier voltage gain is set by the combination of the input resister r in and the feedback resistor r fb and is calculated by the equation: in fb r r av ? = where for channel 1: r fb =r fb1 and r in =r in1 and for channel 2: r fb =r fb2 and r in =r in2 . the mp7742 includes four high-power mosfets wherein for each channel the output driver stage uses two 250m ? n-channel mosfets to deliver the pulses to the lc output filter which in turn drives the load. to fully enhance the high-side mosfet, the gate is driven to a voltage higher than the source by the bootstrap capacitor between sw and bs. while the output is driven low, the bootstrap capacitor is charged from v dd through an internal circuit on the mp7742. the gate of the high-side mosfet is driven high from the voltage at bs, forcing the mosfet gate to a voltage higher than v dd and allowing the mosfet to fully turn on, reducing power loss in the amplifier. pop elimination the capacitors c out1 and c out2 block the dc signal and pass only ac signals to the load. to insure that the amplifier passes low frequency signals, the time constant of c out *r load is long. however, when en is asserted, the capacitor charges over a long period and in a normal amplifier can result in a turn on and/or turn off ?pop.? the mp7742 includes integrated circuitry that eliminates the turn on and turn off pop associated with the charging of the ac coupling capacitor. short circuit/overload protection the mp7742 has internal overload and short circuit protection. the currents in both the high- side and low-side mosfets are measured and if the current exceeds the 4.5a short circuit current limit, both mosfets are turned off. the mp7742 then restarts with the same power up sequence that is used for normal starting to prevent a pop from occurring after a short circuit condition is removed. for vdd > 24v, two schottky diodes are required for short-circuit protection, with the cathodes connected to sw1/2 and the anodes connected to pgnd1/2. the diodes should have output current of at least 1a and a minimum of 40v dc blocking voltage rating. please p lace the diodes as close to the mp7742 as possible. for vdd < 24v, the schottky diodes are not required for short circuit protection. if short-circuit protection is not needed, the schottky diodes can be omitted. enable function the mp7742 en input is an active high enable control. to enable the mp7742, drive en with a 2.5v or greater voltage. to disable the amplifier, drive it below 0.8v. while the mp7742 is disabled, the vdd operating current is less than 100a and the output driver mosfets are turned off.
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 8 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. application information component selection the mp7742 uses a minimum number of external components to complete a stereo class d audio amplifier. the circuit of figure 1 is optimized for a 24v power supply. this circuit should be suitable for most applications. however, if this circuit is not suitable, use the following sections to determine how to customize the amplifier for a particular application. setting the voltage gain the maximum output voltage swing is limited by the power supply. to achieve the maximum power out of the mp7742 amplifier, set the gain such that the maximum input signal results in the maximum output voltage swing. the maximum output voltage swing is v dd /2. for a given input signal voltage, where v in (pk) is the peak input voltage, the maximum voltage gain is: ) pk ( v 2 v ) max ( a in dd v = this voltage gain setting results in the peak output voltage approaching it?s maximum for the maximum input signal. in some cases the amplifier is allowed to overdrive slightly, allowing the thd to increase at high power levels, and so a higher gain than a v (max) is required. setting the switching frequency the idle switching frequency (the switching frequency when no audio input is present) is a function of several variables: the supply voltage v dd , the timing capacitor c int and the feedback resistor r fb . lower switching frequencies result in more inductor ripple, causing more quiescent output voltage ripple and increasing the output noise and distortion. higher switching frequencies result in more power loss. the optimum quiescent switching frequency is approximately 600khz to 700khz. it is recommended to set right channel idol switching frequency larger than left channel?s with 50khz difference by using different timing capacitor c int . refer to the operating specifications for recommended values. table 1?switching frequency vs. v dd , timing capacitor and feedback resistor (see figure 1) left channel right channel v dd (v) gain (v/v) r fb (k ? ) r in (k ? ) c int1 (nf) f sw1 (khz) c int2 (nf) f sw2 (khz) 12 5.6 56 10 4.7 560 3.3 700 12 8.2 39 4.7 5.6 620 4.7 700 12 12.0 56.4 4.7 4.7 530 3.3 670 12 17.6 56.4 3.2 4.7 530 3.3 670 12 25.5 56.4 2.2 4.7 530 3.3 670 12 30 60 2 4.7 520 3.3 650 24 5.6 56 10 10 540 8.2 650 24 8.2 82 10 5.6 610 4.7 690 24 12.0 120 10 4.7 530 3.3 660 24 17.4 82 4.7 5.6 610 4.7 690 24 25.5 120 4.7 4.7 530 3.3 660 24 30 120 4 4.7 530 3.3 660 choosing the lc filter the inductor-capacitor (lc) filter converts the pulse train at sw to the output voltage that drives the speaker. typical values for the lc filter are shown in figure 1, 10h inductor and 0.47f capacitor. the characteristic frequency of the lc filter needs to be high enough to allow high frequency audio to the output, yet needs to be low enough to filter out high frequency products of the pulses from sw. the characteristic frequency of the lc filter is: lc 2 1 f 0 = the voltage ripple at the output is approximated by the equation: ? ? ? ? ? ? ? ? ? sw 0 dd ripple f f v v
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 9 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the quality factor (q) of the lc filter is important. if this is too low, output noise will increase, if this is too high, then peaking may occur at high signal frequencies reducing the passband flatness. the circuit q is set by the load resistance (speaker resistance, typically 4 ? or 8 ? ). the q is calculated as: l f r l r q = = 0 0 2 0 is the characteristic frequency in radians per second and f 0 is in hz. use an lc filter with q between 0.7 and 1. the actual output ripple and noise is greatly affected by the type of inductor and capacitor used in the lc filter. use a film capacitor and an inductor with sufficient power handling capability to supply the output current to the load. the inductor should exhibit soft saturation characteristics. if the inductor exhibits hard saturation, it should operate well below the saturation current. gapped ferrite, mpp, powdered iron, or similar type toroidal cores are recommended. if open or shielded bobbin ferrite cores are used for multi-channel designs, make sure that the start windings of each inductor line up (all starts going toward sw pin, or all starts going toward the output) to prevent crosstalk or other channel-to-channel interference. output coupling capacitor the output ac coupling capacitor c out serves to block dc voltages and thus passes only the amplified ac signal from the lc filter to the load. the combination of the coupling capacitor, c out and the load resistance results in a first-order high-pass filter. the value of c out should be selected such that the required minimum frequency is still allowed to pass. the output corner frequency (-3db point), f out , can be calculated as: out load out c r 2 1 f = set the output corner frequency (f out ) at or below the minimum required frequency. the output coupling capacitor carries the full load current, so a capacitor should be chosen such that its ripple current rating is greater than the maximum load current. low esr aluminum electrolytic capacitors are recommended. input coupling capacitor the input coupling capacitors c in1 and c in2 are used to pass only the ac signal at the input. in a typical system application, the source input signal is typically centered around the circuit ground, while the mp7742 input is at half the power supply voltage (v dd /2). the input coupling capacitor transmits the ac signal from the source to the mp7742 while blocking the dc voltage. choose an input coupling capacitor such that the corner frequency (f in ) is less than the passband frequency. the corner frequency is calculated as: in in in c r 2 1 f = power source for maximum output power, the amplifier circuit requires a regulated external power source to supply the power to the amplifier. the higher the power supply voltage, the more power can be delivered to a given load resistance, however if the power source voltage exceeds the maximum voltage of 28v, the mp7742 may sustain damage. the power supply rejection of the mp7742 is excellent (typically 60db), however noise at the power supply can get to the output, so care must be taken to minimize power supply noise within the pass-band frequencies. bypass the power supply with a large capacitor (typically aluminum electrolytic) along with a smaller 1f ceramic capacitor at the mp7742 v dd supply pins. pcb layout the circuit layout is critical for optimum performance and low output distortion and noise. it is highly recommended to duplicate evb layout for optimum performance. if change is necessary, please follow these guidelines and take figure 2 for references. 1) place the following components as close to the mp7742 as possible: bootstrap cap c bs1 and c bs2 are used to supply the gate drive current to the internal high-side mosfet. place c bs1 as close to pins 17 and
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 10 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. 19 as possible. likewise, place c bs2 as close to pins 12 and 14 as possible. power supply bypass, c byp c byp1 and c byp2 carry the transient current for the switching power stage. to prevent overstressing of the mp7742 and excessive noise at the output, place c byp1 as close to pins 18 (vdd1) and 20 (pgnd1) as possible and also place c byp2 as close to pins 13 (vdd2) and 15 (pgnd2) as possible. timing capacitors c int1 and c int2 are used to set the amplifier switching frequencies and are typically on the order of a few nf. place c int1 as close to pins 2 and 3 as possible to reduce distortion and noise. likewise, place c int2 as close to pins 7 and 8 as possible. reference bypass capacitors c r1 and c r2 filter the ? v dd reference voltages. place c r1 and c r2 as close to the ic as possible to improve power supply rejection and reduce distortion and noise at the output. output catch diodes (optional components) d sl1 and d sl2 carry the current over the dead-time while the mosfet switches are off and provide the short circuit protection. place the diodes as close to the mp7742 as possible if these diodes are needed. 2) the inductor-capacitor (lc) filter converts the pulse train at sw to the output voltage that drives the speaker. please keep the filter capacitor close to the inductor. 3) when laying out the pcb, use two separate ground planes, analog ground (agnd) and power ground (pgnd), and connect the two grounds together at a single point (usually around the bulk bypass capacitor) to prevent noise injection into the amplifier input to reduce distortion. 4) keep the sensitive feedback signal trace on the input side and shield the trace with the agnd plane. make sure that any traces carrying the switch node (sw) voltages are separated far from any input signal traces. if it is required to run the sw trace near the input, shield the input with a ground plane between the traces. for multiple channel applications, make sure that each channel is physically separated to prevent crosstalk. make sure that all inductors used on a single circuit board have the same orientation. also, make sure that the power supply is routed from the source to each channel individually, not serially. this prevents channel-to-channel coupling through the power supply input. electro-magnetic interference (emi) considerations due to the switching nature of the class d amplifier, care must be taken to minimize the effects of electromagnetic interference from the amplifier. however, with proper component selection and careful attention to circuit layout, the effects of the emi due to the amplifier switching can be minimized. the power inductors are a potential source of radiated emissions. for the best emi performance, use toroidal inductors, since the magnetic field is well contained inside the core. however toroidal inductors can be expensive to wind. for a more economical solution, use shielded gapped ferrite or shielded ferrite bobbin core inductors. these inductors typically do not contain the field as well toroidal inductors, but usually can achieve a better balance of good emi performance with low cost. the size of high-current loops that carry rapidly changing currents needs to be minimized. to do this, make sure that the v dd bypass capacitors are as close to the mp7742 as possible.
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 11 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. nodes that carry rapidly changing voltage, such as sw, need to be made as small as possible. if sensitive traces run near a trace connected to sw, place a ground shield between the traces.
mp7742 ? 2 x 15w class d stereo single ended audio amplifier mp7742 rev. 0.91 www.monolithicpower.com 12 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical application circuits mp7742 bs1 sw1 bs2 sw2 ref1 2 v dd v dd 3 8 ch1 input 7 6 10 4, 5 9 ch1 output ch2 output 14 18 20 13 15 12 19 17 in1 ref2 in2 en2 en1 agnd2 agnd1 pgnd2 vdd2 v dd c byp2 c byp1 c vddbyp d sl2 d sl1 c f1 c out1 l f1 l f2 c out2 c f2 c bs2 c sn1 390pf c sn2 390pf c bs1 c fb1 22pf 22pf 10uf 50v 10uf 50v 2.2uf 50v 2.2uf 50v 100uf 50v 1000uf 50v 1000uf 50v 0.47uf 50v 0.47uf 50v 2.2uf 50v 0.47uf 16v (optional) (7) mbrs140tr (optional) (7) mbrs140tr 0.47uf 16v 10uh, 3.5a 10uh, 3.5a 2.2uf 50v 5.6nf 4.7nf r fb1 ch2 input en pgnd1 vdd1 c fb2 r fb2 c in2 r in2 c in1 r in1 c r2 c int2 r rl2 r rh2 c r1 c int1 r rl1 r rh1 figure 1?2 x 15w stereo typical application circuit note: 7) schottky diodes d sl1 &d sl2 only be required for short circuit protection w hen vdd > 24v. detailed see short circuit/overload protection section in operation information. a) top layer shown agnd pgnd d sl1 d sl2 optional (7) b) bottom layer shown figure 2?reference pcb layout
mp7742 ? 2 x 15w class d stereo single ended audio amplifier notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp7742 rev. 0.91 www.monolithicpower.com 13 1/25/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. package information tssop20f (exposed pad) note: 1) all dimensions are in millimeters. 2) package length does not include mold flash, protrusion or gate burr. 3) package width does not include interlead flash or protrusion. 4) lead coplanarity (bottom of leads after forming) shall be 0.10 millimeters max. 5) drawing conforms to jedec mo-153, variation act. 6) drawing is not to scale. 0.19 0.30 6.40 6.60 seating plane 0.65 bsc pin 1 id 4.30 4.50 6.20 6.60 110 11 20 0.80 1.05 1.20 max 0.00 0.15 top view front view side view 0.09 0.20 bottom view 2.60 3.10 3.80 4.30 recommended land pattern 5.80 typ 1.60 typ 0.40 typ 0.65 bsc 3.20 typ 4.40 typ detail a 0.45 0.75 0 o -8 o 0.25 bsc gauge plane see detail "a"

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