ev 2908a - f - 01a wide input, current mode synchronous step - down controller evaluation board ev 2908a - f - 01a rev. 1. 1 www.monolithicpower.com 1 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all righ ts reserved. description the ev2908a - f - 01a is an evaluation board for mp2908a, a high voltage, synchronous step - down switching regulator controller that can directly step - down voltages from up to 60v. it uses pwm current control architecture with accurate cycle - by - cyc le current limiting and is capable of driving dual n - channel mosfets. advanced asynchronous mode (aam) enables non - synchronous operation to optimize light - load efficiency. the operating frequency of the mp2908a can be programmed by an external resistor or synchronized to an external clock for noise - sensitive applications. full protection features include precision output over - voltage protection (ovp), output over - current protection (ocp), and thermal shutdown. the ev2908a - f - 01a is assembled and tested with tssop20 - ep package. electrical specifica tion parameter symbol value units input voltage v in 6 - 60 v output voltage v out 5 v output current i out 7 a features ? wide 6 v to 60v operating input range ? dual n - channel mosfet driver ? 0.8v voltage reference with 1.5% accuracy over temperature ? low dropout operation: maximum d uty c ycle at 99 .5 % ? programmable f requency range : 100khz - 1000 khz ? external sync clock range: 100khz - 1000khz ? 180o out - of - phase synco ? programmable soft start ? power good output voltage monitor ? selectable cycle - by - cycle current limit ? output over - v oltage protection (ovp) ? over - current protection (ocp) ? internal ldo with external power supply option ? programmable ccm, aam mode all mps parts are lead - free and adhere to the rohs directive. for mps gre en status, please visit mps website under products, quality assurance page. mps and the future of analog ic technology , are registered trademarks of monolithic power systems, inc. ev 2908a - f - 01a evaluation board (l w h) 8 .36 cm 8.36 cm 1. 18 cm board number mps ic number ev2908a - f - 01a MP2908AGF
ev 2908a - f - 01a C wide input, synchronous step - do wn controller ev 2908a - f - 01a rev. 1. 1 www.monolithicpower.com 2 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all righ ts reserved. evaluation board sch ematic tssop20 - ep v out (v) r6 (k?) r 9 (k?) 3.3 37.4 (1%) 12 (1%) 5 63.4 (1%) 12 (1%) 12 169 (1%) 12 (1%) ev 2908a - f - 01a bill of materials qty ref value description package manufacturer part number 4 cin1,cin2, cin3,cin4 ns 1 cin5 47 f electrolytic cap; 100v;10*10.5; 2000h;105 smd jiang hai vz2 - 100v47 2 c1a, c1b 4.7 f ceramic cap; 100v;x7s 1210 tdk c3225x7s2a475k 1 c1 0. 47 f ceramic cap; 100v;x7r 0805 murata grm21br72a474ka73l 1 c2 1 f ceramic cap; 16v;x7r 0603 murata grm188r71c105ka12d 1 c3 4.7 f ceramic cap; 16v;x7r 0805 murata grm21br71c475ka73l 5 c4,c7,c9, c10,c12 4 1 , 2 , 3 5 , 6 , 7 , 8 m 1 4 1 , 2 , 3 5 , 6 , 7 , 8 m 2 100 k r 2 37 . 4 k r 1 16 v 16 v synco en / sync 680 pf c 6 51 k r 5 ns c 7 6 v - 60 v 0 . 1 uf c 8 16 v 0 . 007 r 7 63 . 4 k r 8 12 k r 9 vout 5 v / 7 a 4 . 7 uh l 2 4 . 7 uf c 1 b 4 . 7 uf c 1 a 100 v 100 v 10 nf c 5 ns r 10 ns c 10 4 1 , 2 , 3 5 , 6 , 7 , 8 m 3 4 1 , 2 , 3 5 , 6 , 7 , 8 m 4 0 r 11 0 r 12 1 n 4148 ws d 1 2 . 2 r 13 ns c 9 0 . 47 uf c 1 pg 1 uf c 2 vcc 2 0 r 3 vout vout vcc 1 vcc 1 37 . 4 k r 4 ns c 4 10 r 14 220 pf c 11 dfls 1150 100 k r 15 vin vin 1 m r 16 ns r 17 ns c 12 4 . 7 uf c 3 220 uf cout 1 6 . 3 v ns cout 2 22 uf cout 3 16 v ns cout 4 vcc 1 10 r 18 d 3 d 2 ns 1 % 100 v 0 r 19 0 r 6 vin vemi gnd ns cin 4 fb 1 ns 47 uf 100 v cin 5 l 1 ns ns cin 3 ns cin 1 ns cin 2 in 1 freq 10 en / sync 2 synco 13 ss 6 ilimit 12 c o m p 7 fb 8 ccm / aam 9 a g n d 5 sense - 14 sense + 15 pg 11 vcc 2 3 p g n d 1 6 bg 17 vcc 1 4 sw 18 tg 19 bst 20 u 1 mp 2908 agf 1 2 3 jp 1 vcc 1 1 2 3 jp 2 note : thermal pad connects to pgnd and agnd input filter r 1 ( r 4 ) fsw 19 k o 1 mhz 37 . 4 k o 500 khz 63 k o 300 khz ccm aam pg high if vout within +/ - 10 % soft - start : 4 . 7 nf - > 0 . 94 ms 10 nf - > 2 ms 22 nf - > 4 . 4 ms tss ( ms )= css ( nf ) xvref ( 0 . 8 v )/ iss ( 4 ua ) s y n c o m p 2 9 0 8 a 3 s e n s e + i n e n / s y n c c o m p v c c 2 f r e q b g b s t t g s e n s e - 4 5 6 7 8 1 8 1 7 1 6 1 5 1 4 1 3 p g n d f b s s 2 1 9 2 0 1 s w s g n d v c c 1 c c m / a a m 9 1 0 i l i m p g 1 2 1 1
ev 2908a - f - 01a C wide input, synchronous step - do wn controller ev 2908a - f - 01a rev. 1. 1 www.monolithicpower.com 3 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all righ ts reserved. ev 2908a - f - 01a bill of materials (continued) qty ref value description package manufacturer part number 1 c5 10nf ceramic cap; 50v;x7r 0603 mu rata grm188r71h103ka01 1 c6 680pf ceramic cap; 50v;x7r 0603 murata grm188r71h681ka01d 1 c8 0.1 f ceramic cap; 16v;x7r 0603 murata grm188r71c104ka01d 1 c11 220pf ceramic cap; 100v;x7r 0805 murata grm21br72a221ka01l 1 cout1 220 f poscap;6.3v; d2 sanyo 6tpe220mi 1 cout3 22 f ceramic cap; 16v;x7r 1210 murata grm32er71c226ke79 2 cout2, cout4 ns 1 d1 1n4148ws diode;75v;0.15a; sod - 323 diodes 1n4148ws - 7 - f 1 d2 ns 1 d3 dfls1150 diode;150v;1a; diodes dfls1150 1 fb1 ns 1 l1 ns inductor;4.7 h; 7.7mohm;15a smd wurth 7443551470 1 m1 sqj850ep n - channel mosfet; 60v;24a;0.023ohm powerpa k so - 8l vishay sqj850ep 1 m2 bsc100n06 ls3 (opt) n - channel mosfet; 6 0v;50a;0.010ohm pg - tdson - 8 infineon bsc100n06ls3 2 m3, m4 ns 1 r9 12 k film resistor;1% 0603 yageo rc0603fr - 0712kl 2 r10, r17 ns 0603 1 r13 2.2 film res istor;1% 0603 yageo rc0603fr - 072r2l 1 r14 10 film resistor;1% 0805 yageo rc0805fr - 0710rl 1 r16 1m film resistor;1% 0603 yageo rc0603fr - 071ml 1 r18 10 film resistor;1% 0603 yageo rc0603fr - 0710rl 1 u1 mp2908a synchronous step - down controller tssop20 - ep m ps MP2908AGF
ev 2908a - f - 01a C wide input, synchronous step - do wn controller ev 2908a - f - 01a rev. 1. 1 www.monolithicpower.com 4 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all righ ts reserved. typical performance characteristics v in = 24v, v out = 5v, l = 4.7h, t a = +25c
ev 2908a - f - 01a C wide input, synchronous step - do wn controller ev 2908a - f - 01a rev. 1. 1 www.monolithicpower.com 5 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all righ ts reserved. typical performance characteristics (continued) v in = 24 v, v out = 5 v , l = 4.7h , t a = + 25 c
ev 2908a - f - 01a C wide input, synchronous step - do wn controller ev 2908a - f - 01a rev. 1. 1 www.monolithicpower.com 6 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all righ ts reserved. typical performance characteristics (continued) v in = 24 v, v o ut = 5 v , l = 4.7h , t a = + 25 c
ev 2908a - f - 01a C wide input, synchronous step - do wn controller ev 2908a - f - 01a rev. 1. 1 www.monolithicpower.com 7 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all righ ts reserved. printed circuit boar d layout figure 1 top silk & top layer figure 2 bottom silk & bottom laye r figure 3 inner layer 1 figur e 4 inner laye r
ev 2908a - f - 01a C wide input, synchronous step - do wn controller notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party i ntellectual p roperty r ights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. ev2908a - f - 01a rev. 1. 1 www.monolithicpower.com 8 11/23/2016 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. quick start g uide 1. connect the positive and negative terminals of the load to the vout and gnd pins, respectively. set load current between 0 - 7 a . be aware that electronic loads represent a negative impedance to the regulator and if set to a too high current will trigger over - current - protection or short - current - protection. 2. preset the power supply output between 6 v and 60 v, and then turn off the power supply. if longer cables are used between the source and the evb (>0.5m total), a damping capacitor should be installed at the input terminals , e specially when v in ? 24v . 3. connect the positive and negative terminals of the power supply output to the vin and gnd pins, respectively. 4. turn the power supply on. the board will automatically start up. the default v out is 5 v . 5. to get bett er emi performance, add the emi components at bottom layer of the board and connect the input power supply between vemi and gnd. 6. to use en turning on/off mp 2908a , remove r16 first. then give a voltage between en and gnd higher than 1. 22 v to turn on, lower than 1 .09 v to turn off. to use the sync function, connect an external clock with a range of 100 khz to 1000 khz to synchronize the internal clock rising edge to the external clock rising edge. 7. synco can output an out of phase 180oc clock when pa rt works at ccm mode for dual channel co - pack. 8. note that if part works at high vin and high fsw condition, please make sure that trise of hs mos no higher than 175oc.
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