ev7720ds-00a 20w stereo class d single ended audio amplifier evaluation board ev7720ds-00a rev. 1.0 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 ev7720ds-00a is the evaluation board for the mp7720, a mono 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 mp7720 utilizes a single ended output structure with capacitor divider configuration capable of delivering 20w 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 psrr, 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 ? no supply pumping ? thd+n = 0.08% at 1w, 8 ? ? 90% efficiency at 20w ? switching frequency up to 1mhz ? 9.5v to 24v operation from a single supply ? integrated startup and shutdown pop elimination circuit ? thermal protection ? mute/standby modes (sleep) applications ? surround sound dvd systems ? televisions ? 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. ev7720ds-00a evaluation board dimensions (2.4?x x 3.5?y x 1.2?z) board number mps ic number ev7720ds-00a MP7720DS 10 1 0.1 0.01 thd+n (%) 0.1 1 10 power (w) thd+n vs output power v dd = 24v, f = 1khz
ev7720ds-00a ? 20w stereo class d single ended audio amplifier ev7720ds-00a rev. 1.0 www.monolithicpower.com 2 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. evaluation board schematic mp7720 u2 pin nin agnd en 8 7 6 5 pgnd sw vpp bs 1 2 3 4 d3 zener 6.2v d4 1n4148 + + + tp1 vccu2 en ext_enable sw100 q2 2n3904 q1 2n3904 en c12 3.9nf c5 ns c16 22pf 50v c19 390pf 50v led100 led1206 d8 b130b out2 sp1:a out2-- out2+ vcc vccu2 en l4 bead/4a cn101 rca in2 mp7720 u1 pin nin agnd en 8 7 6 5 pgnd sw vpp bs 1 2 3 4 d1 zener 6.2v d2 1n4148 + + + q3 2n3904 q4 2n3904 en c11 4.7nf c6 ns c15 22pf 50v c9 390pf 50v d6 b130b out1 sp1:b out1-- out1+ vcc vcc vccu2 en l3 bead/4a cn100 rca in1 + cn102 vcc gnd fb1 bead/4a
ev7720ds-00a ? 20w stereo class d single ended audio amplifier ev7720ds-00a rev. 1.0 www.monolithicpower.com 3 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. ev7720ds-00a bill of materials qty ref value description package manufacturer p/n 3 c1, c3, c124 1f ceramic capacitor, 16v, x7r 0805 murata: grm21br71c105ka99 2 c2, c4 1f ceramic capacitor, 25v, x7r 0805 murata: grm21br71e105ka99 2 c5, c6 ns not stuffed 2 c7,c8 0.47f ceramic capacitor, 16v, x7r 0603 murata: grm188r71c474ka88d 2 c9, c19 390pf ceramic capacitor, 50v, c0g 0603 murata: grm1885c1h3901ja01 4 c10, c20, c21, c22 0.1f ceramic capacitor, 50v, x7r 0603 murata: grm188r71h104ka993d 2 c11 4.7nf ceramic capacitor, 50v, x7r 0603 murata: grm188r71h472ka01 1 c12 3.9nf ceramic capacitor, 50v, x7r 0603 murata: grm188r71h392ka01 3 c13, c14, c27 470f electrolytic capacitor, 35v, yxf radial rubycon: 35yxf470m 2 c15,c16 22pf ceramic capacitor, 50v, c0g 0603 murata: grm1885c1h220ja01 2 c17, c18 2.2f ceramic capacitor, 25v, x7r 1206 murata: grm31mr71e225ka93 2 c102, c114, 1f ceramic capacitor, 25v, x7r 1206 murata: grm31cr71e105ka88 2 c23, c24 0.47f capacitor, 50v, x7r radial any 4 c25, c26, c28, c29 1000f electrolytic capacitor, 25v, yxf radial rubycon: 25vyxf1000m 2 cn100, cn101 phone jack, female rca any 1 cn102 banana jack connector any 2 d1, d3 zener diode 6.2v/250mw sod323 diodes inc.: bzt52c6v2s 2 d2, d4 diode switch, 75v, 100ma sod323 diodes inc.: 1n4148 2 d6, d8 schottky diode, 1a/30v smb diodes inc.: b130b-13-f 3 fb1, l3, l4 ferrite bead bs43 toko: bs43 2 l1, l2 10h inductor radial toko: 13rhbp-a7502by-100m 1 led100 led 1206 any 4 q1,q2,q3,q 4 npn, 2n3904 sot23 on semi: mmbt3904
ev7720ds-00a ? 20w stereo class d single ended audio amplifier ev7720ds-00a rev. 1.0 www.monolithicpower.com 4 10/19/2007 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2007 mps. all rights reserved. ev7720ds-00a bill of materials (continued) qty ref value description package manufacturer p/n 2 r1, r2 20k ? resistor, 5% 0603 yageo: rc0603jr-0720kl 2 r3, r4 10k ? resistor, 1% 0603 yageo: rc0603fr-0710kl 2 r5, r6 10k ? resistor, 5% 0603 yageo: rc0603jr-0710kl 2 r7, r11 10 ? resistor, 5% 0603 yageo: rc0603jr-0710rl 2 r8, r12 10 ? resistor, 5% 1206 yageo: rc1206jr-0710rl 4 r9, r201, r202, r203, r204, 100k ? resistor, 1% 0603 yageo: rc0603fr-07100kl 2 r10, r19 200k ? resistor, 5% 0603 yageo: rc0603jr-07200kl 2 r13, r14 24k ? resistor, 5% 0603 yageo: rc0603jr-0725rl 4 r15, r16, r20, r21 560k ? resistor, 5% 0603 yageo: rc0603jr-07560kl 2 r17, r18 121k ? resistor, 1% 0603 yageo: rc0603fr-07120kl 2 r22, r24 110k ? resistor, 5% 0603 any 2 r23, r25 150k ? resistor, 5% 0603 any 1 r112 3k ? resistor,5% 0603 yageo: rc0603jr-073kl 2 r113,r114 18k ? resistor, 5% 0603 yageo: rc0603jr-0718kl 1 sp1 speaker connector, red and black any 1 sw100 switch slide, 12v, 0.1a any 1 tp1 test point any 2 u1, u2 so8 mps: mp7720
ev7720ds-00a ? 20w stereo class d single ended audio amplifier ev7720ds-00a rev. 1.0 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 0 -20 -40 -60 -80 -100 -120 -140 amplitude (dbr) 100 1k 10k frequency (hz) 0 -20 -40 -60 -80 -100 -120 amplitude (dbv) 100 1k 10k frequency (hz) +4 +2 0 -2 -4 -6 -8 -10 amplitude (dbr) 10 100 1k 10k frequency (hz) frequency response a v = 12 10 1 0.1 0.01 thd+n (%) 100 1k 10k frequency (hz) thd+n vs frequency p out = 1w 100 90 80 70 60 50 40 30 20 10 0 efficiency (%) 0 5 10 15 20 25 output power (w) efficiency vs output power 2.385 90 80 70 60 50 40 30 20 10 0 output power (w) 10 20 30 40 50 60 70 80 90 100 v dd (v) 2.385 90 80 70 60 50 40 30 20 10 0 output power (w) 10 20 30 40 50 60 70 80 90 100 v dd (v) 10% 1% 10% 1% 10 1 0.1 0.01 thd+n (%) 0.1 1 10 power (w) thd+n vs output power f = 1khz
ev7720ds-00a ? 20w stereo class d single ended audio amplifier ev7720ds-00a rev. 1.0 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 layer figure 5?ev7720ds-00a connection diagram
ev7720ds-00a ? 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. ev7720ds-00a rev. 1.0 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 a 12v power supply, adjust the components as specified in section 3 below. for more information, consult the mp7720 datasheet. 1. power requirements a. power supply: 24v, 6a maximum b. 0v to 1vrms (max) audio signal source c. speaker: 4 ? or 8 ? 2. setup conditions for 24v operation a. connect the outputs to the external speakers b. adjust the power supply to 24v before connecting to the evaluation board c. turn off the power supply d. connect the power supply to the vdd terminals e. set the enable switch to the disable position f. connect the audio input signal source to the amplifier inputs (in1, in2) g. turn on the power supply to apply power to the board 3. 12v operation modifications a. change c11 to 2.2nf and c12 to 1.8nf b. remove r22, r24 and r113. change r1 and r2 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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