ev7722df-02a 20w stereo class d single ended audio amplifier evaluation board ev7722df-02a rev. 1.1 www.monolithicpower.com 1 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. the future of analog ic technology description the ev7722df-02a is the evaluation board for the mp7722. the mp7722 is a stereo 20w class d audio amplifier. it is one of mps? second generation of fully integrated audio amplifiers which dramatically reduces solution size by integrating the following: ? 180m ? power mosfets ? startup / shutdown pop elimination ? short circuit protection circuits ? mute / standby the mp7722 utilizes a single ended output structure with capacitor divider configuration capable of delivering 2x20w into 4 ? speakers. mps class d audio amplifiers exhibit the high fidelity of a class a/b amplifier at efficiencies greater than 90%. the circuit is based on the mps? aam tm proprietary variable frequency topology that delivers excellent linearity, fast response time and operates on a single power supply. electrical specifications parameter symbol value units supply voltage v dd 24 v features ? 20w output at v dd = 24v into a 4 ? load ? thd+n = 0.08% at 1w, 8 ? ? 90% efficiency at 20w ? 9.5v to 24v operation from a single supply ? mute/standby modes (sleep) applications ? flat panel and projection televisions ? dvd and surround sound systems ? flat panel monitors ? 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. ev7722df-02a evaluation board (l x w x h) 3.5? x 2.4? x 1.2? 8.9cm x 6.1cm x 3.0cm board number mps ic number ev7722df-02a MP7722DF thd+n (%) p out (w) thd+n vs output power v dd = 24v, f = 1khz 20 10 1 0.1 0.01 0.1 1.0 10
ev7722df-02a ? 20w stereo class d single ended audio amplifier ev7722df-02a rev. 1.1 www.monolithicpower.com 2 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. evaluation board schematic + + cn1 cn2 in2 in1 + + + + + + + + vcc en en vcc vcc vcc en vcc vcc en en tp1 ext. enable enable enable switch disable/ext en. sw1 d7 q2 2n3904 q3 2n3904 q1 2n3904 q4 2n3904 out1 sp1:a out2 sp1:b out2-- out1-- out2+ out1+ d2 6.2v d5 6.2v d4 b130b d1 b130b r4 ns r17 ns c13 ns c25 ns c24 ns fb2 cn3 vdd gnd c19 390pf 50v c11 390pf 50v optional protection circuit d3 1n4148 d6 1n4148 c1 22pf 50v c26 22pf 50v c2 ns fb1 c6 3.9nf 50v c15 4.7nf 50v mp7722 u1 nc ref1 in1 agnd1 nc en1 in2 ref2 agnd2 en2 20 19 18 17 16 15 14 13 12 11 pgnd1 sw1 vdd1 bs1 nc pgnd2 sw2 vdd2 bs2 nc 1 2 3 4 5 6 7 8 9 10 +
ev7722df-02a ? 20w stereo class d single ended audio amplifier ev7722df-02a rev. 1.1 www.monolithicpower.com 3 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. ev7722df-02a bill of materials qty ref value description package manufacturer p/n 2 c1, c26 22pf ceramic capacitor, 50v, c0g 0603 murata: grm1885c1h220ja01 4 c2, c13, c25, c24 not stuffed 3 c3, c23, c27 470f electrolytic capacitor, 470uf, 35v, yxf radial rubycon: 35yxf470m 4 c4, c9, c14, c21 2.2f electrolytic capacitor, 25v, yxf radial rubycon: 25yxf2m2 2 c5, c22 2.2f ceramic capacitor, 25v, x7r 1206 murata: grm31mr71e225ka93 1 c6 3.9nf ceramic capacitor, 50v, x7r 0603 murata: grm188r71h392ka01 4 c7, c16, c29, c30 1000f electrolytic capacitor, 25v, yxf radial rubycon: 25vyxf1000m 4 c8, c17, c31, c32 0.47f ceramic capacitor, 16v, x7r 0603 murata: grm188r71c474ka88d 2 c10, c18 0.47f film capacitor, 50v, x7r radial any 2 c11, c19 390pf ceramic capacitor, 50v, c0g 0603 murata: grm1885c1h3901ja01 2 c12, c20 0.1f ceramic capacitor, 50v, x7r 0603 murata: grm188r71h104ka993d 1 c15 4.7nf ceramic capacitor, 50v, x7r 0603 murata: grm188r71h472ka01 1 c28 1f ceramic capacitor, 16v, x7r 0805 murata: grm21br71c105ka01l 2 cn1, cn2 phone jack, female rca any 1 cn3 banana jack connector any 2 d1, d4 schottky diode, 1a/30v smb diodes: b130b-13-f 2 d2, d5 6.2v zener diode, 6.2v/250mw sod323 diodes inc.: bzt52c6v2s 2 d3, d6 diode switch, 75v, 100ma sod323 diodes: 1n4148 1 d7 led 1206 any 2 fb1, fb2 fuse, ferrite bead, 4a bs43 toko: bs43 2 l1, l2 10h inductor (13rhbp), 5.1a radial toko: 13rhbp-a7502by-100m 4 q1, q2, q3, q4 npn transistor, 2n3904 sot23 on semi: mmbt3904
ev7722df-02a ? 20w stereo class d single ended audio amplifier ev7722df-02a rev. 1.1 www.monolithicpower.com 4 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. ev7722df-02a bill of materials (continued) qty ref value description package manufacturer p/n 2 r1, r20 121k ? resistor, 1% 0603 yageo: rc0603fr-07120kl 4 r2, r3, r13, r18 100k ? resistor, 1% 0603 yageo: rc0603fr-07100kl 2 r4, r17 ns not stuffed 2 r5, r15 10 ? resistor, 5% 0603 yageo: rc0603jr-0710rl 2 r6, r12 24k ? resistor, 5% 0603 yageo: rc0603jr-0725rl 2 r7, r11 10k ? resistor, 1% 0603 yageo: rc0603fr-0710kl 2 r8, r14 10 ? resistor, 5% 1206 yageo: rc1206jr-0710rl 2 r9, r19 10k ? resistor, 5% 0603 yageo: rc0603jr-0710kl 2 r10, r16 20k ? resistor, 5% 0603 yageo: rc0603jr-0720kl 1 r21 100k ? resistor, 5% 0603 yageo: rc0603jr-07100kl 2 r22,r23 18k ? resistor, 5% 0603 yageo: rc0603jr-0718kl 1 r24 3k ? resistor, 5% 0603 yageo: rc0603jr-073kl 2 r25, r33 200k ? resistor, 5% 0603 yageo: rc0603jr-07200kl 4 r28, r29, r32, r34 560k ? resistor, 5% 0603 yageo: rc0603jr-07560kl 2 r26, r31 110k ? resistor, 5% 0603 any 2 r27, r30 150k ? resistor, 5% 0603 any 1 sp1 speaker connector, red and black any 1 sw1 switch slide, 12v, 0.1a any 1 tp1 pin (test point) any 1 u1 mps audio ic MP7722DF tssop20f mps: MP7722DF
ev7722df-02a ? 20w stereo class d single ended audio amplifier ev7722df-02a rev. 1.1 www.monolithicpower.com 5 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. typical performanc e characteristics thd+n (%) frequency (hz) 100 80 60 40 20 0 efficiency (%) 0 5 10 15 20 25 output power (w) output power (w) v dd (v) 20 18 16 14 12 10 8 6 4 2 0 0 5 10 15 20 25 30 output power (w) v dd (v) 20 18 16 14 12 10 8 6 4 2 0 0 5 10 15 20 25 30 thd=10% thd=10% thd=1% thd=1% efficiency vs output power v dd = 24v thd+n vs frequency v dd = 24v, 1w frequency response v dd = 24v, a v = 12 10 1 0.1 0.01 20 100 1k 10k 0 -20 -40 -60 -80 -100 -120 amplitude (dbr) 100 1k 10k frequency (hz) amplitude (dbr) frequency (hz) +4 +2 0 -2 -4 -6 -8 -10 10 100 1k 10k 0 -20 -40 -60 -80 -100 -120 amplitude (dbv) 20 100 1k 10k frequency (hz) thd+n (%) p out (w) thd+n vs output power v dd = 24v, f = 1khz 20 10 1 0.1 0.01 0.1 1.0 10
ev7722df-02a ? 20w stereo class d single ended audio amplifier ev7722df-02a rev. 1.1 www.monolithicpower.com 6 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom silk layer figure 4?bottom and bottom silk layer figure 5?connection diagram
ev7722df-02a ? 20w stereo class d single ended audio amplifier notice: the information in this document is subject to change without notice. users should warrant and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. ev7722df-02a rev. 1.1 www.monolithicpower.com 7 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. quick start guide this board is set up from the factory for 24v operation. to use with a 12v power supply adjust the components as specified in the 12v operation secti on 3 below. for more information, consult the mp7722 datasheet. 1. power requirements a. power supply: 24v, 6a maximum. b. 0v rms to 1v rms (max) audio signal source. c. speaker: 4 ? or 8 ? 2. setup condition for 24v operation a. connect the outputs to the external speakers. b. adjust the power supply to 24v (do not turn on). c. connect the power supply to the vdd terminals. d. set the enable switch to the disable position. e. connect the audio input signal source to the amplifier inputs (in1, in2). f. turn on the power supply to apply power to the board. 3. 12v operation modifications a. change c6 to 1.8nf and c15 to 2.2nf. b. remove r23, r26 and r31. change r10 and r16 from 20k ? to 10k ? c. adjust the power supply to 12v (do not turn on). d. use same procedure for turn on as specified in section 2. 4. music turn-on sequence a. set the enable switch to the enable position. b. audio should be heard from the speaker(s). 5. music turn-off sequence a. set the enable switch to the disable position.
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