ev7740dn-01b 15w stereo class d single ended audio amplifier ev7740dn-01b rev. 1.0 www.monolithicpower.com 1 10/19/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the ev7740dn-01b is the evaluation board for the MP7740, a stereo 15w class d audio amplifier. it is one of mps? products of fully integrated audio amplifiers which dramatically reduce solution size by integrating the following: 250m ? power mosfets startup / shutdown pop elimination short circuit protection circuits the MP7740 utilizes a single ended output structure capable of delivering 15w into 4 ? speakers. mps class d audio amplifiers exhibit the high fidelity of a class a/b amplifier at high efficiency. 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 ? 15w output at v dd = 24v into a 4 ? load ? thd+n = 0.05% at 1w, 8 ? , 1khz ? 90% efficiency at 15w and v dd =24v with 4 ? load ? low noise (103 v typical) ? 9.5v to 36v operation from a single supply 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. ev7740 evaluation board dimensions (2.4?x x 3.5?y x 1.2?z) board number mps ic number ev7740dn-01b MP7740 thd+n vs. p out v dd =24v , freq=1khz,a-wtd thd+n (%) 0.01 20 0.02 0.05 0.1 0.2 0.5 1 2 5 10 60m 200m 1 5 20 p out (w)
ev7740dn-01b ? 15w stereo class d single ended audio amplifier ev7740dn-01b rev. 1.0 www.monolithicpower.com 2 10/19/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. evaluation board schematic
ev7740dn-01b ? 15w stereo class d single ended audio amplifier ev7740dn-01b rev. 1.0 www.monolithicpower.com 3 10/19/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. ev7740dn-01b bill of materials qty ref value description package manufacturer manufacturer p/n 1 c1 2200uf electrolytic capacitor, 50v radial rubycon 2 c2,c3 2.2uf electrolytic capacitor, 50v radial rubycon 2 c4,c5 10uf electrolytic capacitor, 50v radial rubycon 1 c6 5.6nf ceramic capacitor, 50v, x7r 0603 murata grm188r71h562ka01 1 c7 4.7nf ceramic capacitor, 50v,x7r 0603 murata grm188r71h472ka01 2 c8,c9 ns not stuffed 2 c10,c11 22pf ceramic capacitor, 50v,c0g 0603 murata grm1885c1h220ja01d 2 c12, c13 0.47uf ceramic capacitor, 16v,x7r 0603 murata grm188r71c474ka88d 2 c14,c15 2.2uf ceramic capacitor, 50v,x7r 1206 murata grm31cr71h225ka88l 2 c16, c17 390pf ceramic capacitor, 50v,c0g 0603 murata grm1885c1h3901ja01 2 c18, c19 0.47uf film,50v radial any 2 c20,c21 1000uf electrolytic capacitor, 50v radial rubycon 4 c22,c23, c24,c25 0.1uf ceramic capacitor, 50v,x7r 0603 murata grm188r71h104ka93d 2 d1, d2, optional diode schottky, 40v, 3a sma diodes b340la 2 d3, d4 ns not stuffed 2 fb1, fb2 ferrite bead, 6a 1206 lion pb321611-320 1 sw1 dpdt slide switch 2 cn2,cn3 phono jack, female 1 cn1 banana jack connector 1 tp1 test point/ext.en 1 sp1 speaker connector 2 l1, l2 10uh inductor, 3.61a r adial toko 10rhbp-#a671hn-100l 2 r1,r2 ns not stuffed 4 r3, r4, r19,r20, 10k ? film resistor, 1% 0603 yageo rc0603fr-0710kl 5 r5,r6, r7,r8, r9 100k ? film resistor, 1% 0603 yageo rc0603fr-07100kl 2 r10,r18 30.1k ? film resistor, 1% 0603 yageo rc0603fr-0730k1l 2 r11, r12 82.5k ? film resistor, 1% 0603 yageo rc0603fr-0782k5l 1 r13 200k ? film resistor, 5% 0603 yageo rc0603jr-07200kl 4 r14, r15, r16, r17 10 ? film resistor, 1% 0603 yageo rc0603fr-0710rl 2 r21,r22 10k ? film resistor, 5% 0603 yageo rc0603fr-0711rl 2 u1,u2 class d audio amplifier soic8e mps MP7740dn
ev7740dn-01b ? 15w stereo class d single ended audio amplifier ev7740dn-01b rev. 1.0 www.monolithicpower.com 4 10/19/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 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 mps MP7740 demo board ev7740dn-01b in1 in2 for vdd=12v remove r18 out1 out2 vdd ext enable figure 5?ev7740dn-01b connection diagram
ev7740dn-01b ? 15w stereo class d 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. ev7740dn-01b rev. 1.0 www.monolithicpower.com 5 10/19/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. quick start guide 1. this board set up from the factory for 24v operation. to use with 36v power supply, adjust the components as specified in the 36v operation modifications section below. to use with 12v power supply, adjust the components as specified in the 12v operation modifications section below. for more information, consult the MP7740 datasheet. 2. power requirements a. power supply: 9.5v to 36v, 3a maximum. b. 0v to 1.5v rms (max) audio signal source. c. speaker: 4 ? to 8 ? (for 12 v and 24v operation). 6 ? to 8 ? (for 36v operation) 3. 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. 4. 36v operation modifications a. change c6 to 8.2nf and c7 to 6.8nf components. b. adjust the power supply to 36v (do not turn on). c. select 6 ? to 8 ? speaker. d. do as step b~f specified in section 3. 5. 12v operation modifications a. change c6 to 3.3nf and c7 to 2.2nf components. b. remove r18 from the demo board. c. adjust the power supply to 12v (do not turn on). d. do as step b~f specified in section 3. 6. music turn-on sequence set the enable switch to the enable position. 7. music turn-off sequence a. set the enable switch to the disable position. b. turn off power supply.
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