ev7721df-00a 10w stereo class d single ended audio amplifier ev board ev7721df-00a rev. 1.0 www.monolithicpower.com 1 10/2/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic technology description the ev7721df-00a is the evaluation board for the mp7721, a stereo 10w class d audio amplifier. it is one of mps? productions 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 ? mute / standby the mp7721 utilizes a single ended output structure capable of delivering 2x10w into 8 ? 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 ? 10w output at v dd = 24v into a 8 ? load ? thd+n = 0.06% at 1w, 8 ? ? 93% efficiency at 10w ? low noise (190 v typical) ? 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 trademarks of monolithic power systems, inc. a am (analog adaptive modulation) is a trademark of monolithic power systems, inc. ev7721df-00a 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 ev7721df-00a MP7721DF thd+n (%) p out (w) 20 10 1 0.1 0.01 0.1 1 10
ev7721df-00a ? 10w stereo class d sing le ended audio amplifier ev board ev7721df-00a rev. 1.0 www.monolithicpower.com 2 10/2/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. evaluation board schematic v 0 5 / f 0 1 v 0 5 / f 0 1 k 0 1 f p 0 9 3 v 35 1 1 2 34 5 6 2 vcc gnd / f 0 0 2 2 v 0 5 / f 2 . 2 v 0 2, 3, 4 2, 3, 4 5 / f 2 . 2 100k f p 2 2 0 1 0 1 f p 0 9 3 f p 2 2 k 0 1 k 0 1 a c r k 0 0 1 k 0 0 1 k 0 1 k 0 0 1 k 0 1 k 0 0 1 17k 17k 499k disable/ext en. enable for vdd=12v, r24 no stuff 1 4 3 2 v 0 5 f/ 7 4 . 0 v 0 5 f/ 7 4 . 0 k 0 1 v 120k 35 / f 100 0 1 0 1 a c r c9 r7 r2 mp7721 en1 nc ref1 ref2 in1 nc in2 agnd1 en2 vdd1 vdd2 bs1 bs2 nc nc agnd2 pgnd2 pgnd1 sw1 sw2 r3 r9 r13 r18 r19 c21 c4 c27 r24 r23 r22 r21 c6 c15 2.7nf 3.3nf 120k fb2 r20 c26 d1 mbrs130t3 d7 mbrs130t3 d2 6.2v d5 6.2v d3 in4148 d6 in4148 d4 mbrs130t3 d8 mbrs130t3 c1 r1 r6 r5 r8 c7 c12 c20 r14 c10 l1 l2 c11 r15 20k r10 20k r16 c18 c16 r12 c19 fb1 r11 c14 vcc vcc vcc vcc sw1 tp1 sp1:a out2 out1 sp1:b enable switch ext. enable vdd cn3 gnd vcc vcc en en en r17 ns c13 ns c24 ns c2 ns c25 ns r4 ns cn1 in1 in2 cn2 3.61a 3.61a
ev7721df-00a ? 10w stereo class d sing le ended audio amplifier ev board ev7721df-00a rev. 1.0 www.monolithicpower.com 3 10/2/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. ev7721df-00a bill of materials qty ref value description package manufacturer part number 2 c1, c26 22pf ceramic cap., 50v, c0g 0603 murata grm 1885c1h220ja01d 4 c2, c13, c24, c25 ns not stuffed 2 c3, c23 100 f electrolytic cap., 35v radial rubycon 2 c4, c21 10 f electrolytic cap., 50v radial rubycon 2 c5, c22 1 f ceramic cap., 25v, x7r 1206 tdk c3216x7r1h105k 1 c6 3.3nf ceramic cap., 50v, x7r 0603 tdk c1608x7r1h332k 2 c7, c16 1 f electrolytic cap., 25v radial rubycon 2 c8, c17 0.47 f ceramic cap., 25v, x7r 0805 murata grm21br71e 474ka01l 2 c9, c14 2.2 f electrolytic cap., 50v radial rubycon 2 c10, c18 0.47 f film, 50v radial any 2 c11, c19 390pf ceramic cap., 50v, c0g 0603 murata grm 1885c1h391ja01d 2 c12, c20 0.1 f ceramic cap., 50v, x7r 1206 murata gmr21br71h 104ka01l 1 c15 2.7nf ceramic cap., 50v, x7r 0603 tdk c1608x7r1h272k 1 c27 2200 f electrolytic cap., 35v radial rubycon 2 r10, r16 20k ? film res., 1% 0603 yageo rc0603fr-0720kl 2 r23, r24 17k ? film res., 1% 0603 yageo rc0603fr-0716k9l 1 r22 499k ? film res., 1% 0603 yageo rc0603fr-07499kl 2 r5, r15 10 ? film res., 1% 0603 yageo rc0603fr-0710rl 6 r6, r7, r9, r11, r12, r19 10k ? film res., 1% 0603 rc0603fr-0710kl 5 r2, r3, r13, r18, r21 100k ? film res., 1% 0805 yageo 9c08052a1003fkhft 2 r1, r20 120k ? film res., 1% 0805 yageo 9c08052a1203fkhft 2 r4, r17 ns not stuffed 2 r8, r14 10 ? film res., 1% 1206 yageo 9c12063a10r0fkhft 4 d1, d4, d7, d8 mbrs130t3 diode schottky, 30v, 1a smb diodes inc b130b 2 d3, d6 1n4148 diode switch, 75v, 200mw sod-323 diodes inc 1n4148ws-7-f 2 d2, d5 6.2v diode zener, 500mw sod-123 diodes inc bzt52c6v2
ev7721df-00a ? 10w stereo class d sing le ended audio amplifier ev board ev7721df-00a rev. 1.0 www.monolithicpower.com 4 10/2/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. ev7721df-00a bill of materials (continued) qty ref value description package manufacturer part number 2 fb1, fb2 ferrite bead, 6a 1206 steward hi1206t500r-10 2 l1, l2 10 h inductor, 3.61a radial toko 13rhbp-a7502hy- 100m 1 sp1 speaker connector 1 sw1 dpdt slide switch 12v .1a 1 tp1 test point/ext.en 1 cn3 banana jack connector 2 cn1, cn2 phono jack, female 1 u1 class-d audio amplifier tssop20f mps MP7721DF
ev7721df-00a ? 10w stereo class d sing le ended audio amplifier ev board ev7721df-00a rev. 1.0 www.monolithicpower.com 5 10/2/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 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 layer
ev7721df-00a ? 10w stereo class d sing le ended audio amplifier ev board 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. ev7721df-00a rev. 1.0 www.monolithicpower.com 6 10/2/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. quick start guide this board set up from the factory for 24v operation. to use with a 12v power supply, adjust the components as specified in the 12v operation modifications section below. for more information, consult the mp7721 datasheet. figure 5?ev7721df-00a connection diagram 1. power requirements a. power supply: 9.5v to 24v, 3a maximum. b. 0v to 1v rms (max) audio signal source. c. speaker: 8 ? . 2. setup condition for 24v operation a. adjust the power supply to 24v (do not turn on). b. connect the outputs to the external speakers. c. connect the power supply to the v dd 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 2.2nf and c15 to 1.8nf components. b. remove r24 from the demo board. c. adjust the power supply to 12v (do not turn on). d. do as step b~f specified in section 2. 4. music turn-on sequence a. set the enable switch to the enable position. 5. music turn-off sequence a. set the enable switch to the disable position. b. turn off power supply.
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