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? mb39a112evb-01 power supply application evaluation board datasheet cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document number: 002-08322 rev. *a revised november 22, 2016 the mb39a112 evaluation board is a surface mount circuit board with 3 channels of down conversion circuit. this evaluation boar d outputs voltage of 1.2 v, 3.3 v and 5.0 v from the output terminal s of 3 systems, and supplying a current of max 1.5 a. more e ver, when the under voltage lockout protection ci rcuit do operation or the short-circuit protection is detected by the protection fu nction, the fet is turned off and the output is stopped. in addition, each channel can be controlled to be turned on and off, and can be se t for a soft-start. evaluation board specifications (ta ? ? 25 ? c) parameter terminal value unit min typ max input voltage vin 7 12 20 v oscillation frequency ? 2115 2350 2585 khz output voltage ch1 vo1 1.14 1.2 1.26 v ch2 vo2 3.13 3.3 3.47 v ch3 vo3 4.75 5.0 5.25 v ripple voltage ch1 vo1 6 12 24 mv ch2 vo2 16 33 64 mv ch3 vo3 25 50 100 mv output current ch1 vo1 800 1200 1500 ma ch2 vo2 150 500 1000 ma ch3 vo3 150 200 300 ma soft-start time ch1 ? 6.3 10 18.6 ms ch2 ? 7.8 12 22.8 ms ch3 ? 7.8 12 22.8 ms short-circuit detection time ? 430 720 1420 ? s
document number: 002-08322 rev. *a page 2 of 23 mb39a112evb-01 contents evaluation board specifications ................................................................................................ ................ 1 1. terminal description ............................................................... ...... 3 2. switch description .......................................................................................................... ........................ 3 3. setup and checkup ........................................................................................................... ...................... 3 3.1 setup...................................................................................................................... ............................ 3 3.2 checkup.................................................................................................................... ......................... 3 4. component layout ............................................................................................................ ...................... 4 5. connection diagram.......................................................................................................... ...................... 6 6. parts list .................................................................................................................. ................................ 7 7. initial settings ............................................................................................................ ............................ 10 7.1 output voltage............................................................................................................. ..................... 10 7.2 oscillation frequency...................................................................................................... .................. 10 7.3 soft-start time............................................................................................................ ....................... 10 7.4 short-circuit detection time ............................................................................................... ............... 10 8. reference data.............................................................................................................. ......................... 11 8.1 conversion efficiency vs. input voltage.................................................................................... ........ 11 8.2 load reguration (vin ? 12 v) ........................................................................................................ 12 8.3 line regulation ............................................................................................................ ..................... 13 8.4 soft-start operation waveforms ............................................................................................. ........... 14 9. component selection methods ................................................................................................. ........... 15 9.1 ch1 1.2 v output ........................................................................................................... .................. 16 9.2 ch2 3.3 v output ........................................................................................................... .................. 18 9.3 ch3 5 v output ............................................................................................................. ................... 20 10. ordering information ....................................................................................................... .................... 21 document history page .......................................................................................................... .................. 22 sales, solutions, and legal information ........................................................................................ ......... 23
document number: 002-08322 rev. *a page 3 of 23 mb39a112evb-01 1. terminal description 2. switch description 3. setup and checkup 3.1 setup connect power-supply terminals side to the vin and gnd, and connect the vo side to required loading device ? or measuring instrument. set sw1 to sw3 (cs1 to cs 3) to off (output off) . 3.2 checkup turn on vin (power supply) , set sw1 to sw3 to on (output on) . the ic works normally with the following outputs : ? v o 1 ? 1.2 v (typ) , v o 2 ? 3.3 v (typ) , v o 3 ? 5 v (typ) symbol description vin power supply terminal ? v in ? 7 v to 25 v (typ 12 v) vox dc/dc converter output terminal gnd gnd terminal gndx dc/dc converter gnd terminal icgnd mb39a112 gnd terminal sw name function open l 1 cs1 ch1 control output on output off 2 cs2 ch2 control output on output off 3 cs3 ch3 control output on output off
document number: 002-08322 rev. *a page 4 of 23 mb39a112evb-01 4. component layout on-board component layout (continued) ctl1 q4 r6 gnd vin r4 r1 c2 c1 d1 q1 1 3 6 4 c17 c16 m1 fb1 fb3 cscp fb2 cs2 cs3 r14 r15 cs l cs open sw1 sgnd r16 c14 c15 11 20 vcc vcco out2 vh out1 vd1 vo1 gnd1 vo2 gnd2 vo3 gnd3 l1 r2 c4 c3 d2 q2 1 3 6 4 vd2 l2 r3 c6 c5 d3 q3 3 2 1 vd3 l3 out3 r9 1 10 r13 r11 r17 r18 c8 c9 c10 r10 r7 r1 2 c12 nc cs3 cs2 cs1 q5 q6 ctl2 ctl3 r1 9 r8 cs1 c7 r5 c11 c13 r2 0 r2 1 1234
document number: 002-08322 rev. *a page 5 of 23 mb39a112evb-01 (continued) board layout top side inside gnd (layer2) inside vin (layer3) bottom side
document number: 002-08322 rev. *a page 6 of 23 mb39a112evb-01 5. connection diagram + ? ? + + + ? ? + + + ? ? + + ? + + + vref bias 3.5 v vr power on / off ctl bias voltage vh vcco ? 5 v gnd drive3 comp.3 pch io = 150 ma pwm ch3 drive2 comp.2 pch io = 150 ma pwm ch2 drive1 comp.1 pch io = 150 ma pwm ch1 vref 1.0 v error amp1 10 a vref 1.23 v error amp2 10 a vref 1.23 v error amp3 10 a 2.7 v scp comp. scp uvlo osc 2.5 v 2.0 v step-down step-down step-down l priority l priority h priority h: at scp h:uvlo release error amp reference (1.0 v/1.23 v) error amp power supply scpcomp. power supply charge current 1 a cs1 cs2 cs3 nc open l sw1 c b a 4 2 3 1 a vd1 vo1 lo1 = 0.8 a to 1.5 a 1.2 v l1 2 h gnd1 c2 4.7 f c17 0.1 f c1 2.2 f mch3312 q1 0 r1 0 r4 out1 d1 sbe001 vcco b vd2 vo2 lo2 = 0.15 a to 1 a 3.3 v l2 3.3 h gnd2 c4 4.7 f c3 2.2 f mch3312 q2 0 r2 out2 d2 sbe001 c vd3 vo3 lo3 = 0.15 a to 0.3 a 5.0 v l3 10 h gnd3 c6 4.7 f c5 2.2 f c16 0.1 f mch3308 q3 0 icgnd gnd r3 out3 d3 sbs005 a a r6 2.2 k r8 100 k c7 q4 0.1 f ctl1 r19 * * 0.022 f cs1 c8 r7 18 k r9 820 fb1 ? ine1 b b r11 4.7 k r12 56 k r13 36 k c12 q5 0.1 f ctl2 r20 vin (12 v) gnd 0.01 f cs2 c11 r14 820 fb2 ? ine2 c c r15 680 r16 30 k r17 10 k c13 q6 0.1 f ctl3 r21 0.01 f cs3 c14 1000 pf c15 5.1 k r10 rt ct 100 pf c10 r18 1 k fb3 cscp ? ine3 0.1 f c9 r5 vcc gndo vh 0 2 1 3 9 10 8 12 11 13 14 5 6 7 20 19 18 17 16 15 4 * * * l priority ch1 on/off signal (l:on, h:off) ch2 on/off signal (l:on, h:off) ch3 on/off signal (l:on, h:off) * * : not mounted all channels are on state in above diagram <20 pin>
document number: 002-08322 rev. *a page 7 of 23 mb39a112evb-01 6. parts list no. symbol part name model name specification package manu- facturer remarks (circuit diagram mark) rating 1 rating 2 rating 3 value devia- tion features 1m1 ic mb39a ? 112pft ????? ? fpt-20p- m06 cypress 2 q1 pch fet mch3312 pd ? 1 w vgss ? 20 v id ? 2.0 a ?? ? mcph3 sanyo 3 q2 pch fet mch3312 pd ? 1 w vgss ? 20 v id ? 2.0 a ?? ? mcph3 sanyo 4 q3 pch fet mch3308 pd ? 0.8 w vgss ? 20 v id ? 1.0 a ?? ? mcph3 sanyo 5 q4 nch fet ?????? ? ? ? not mounted 6 q5 nch fet ?????? ? ? ? not mounted 7 q6 nch fet ?????? ? ? ? not mounted 8 d1 sbd sbe001 if (av) ? 2 a vrrm ? 30 v ??? ? cph6 sanyo 9 d2 sbd sbe001 if (av) ? 2 a vrrm ? 30 v ??? ? cph6 sanyo 10 d3 sbd sbs005 if (av) ? 1 a vrrm ? 30 v ??? ? cph3 sanyo 11 l1 coil a916cy- 2r0m idc1 ? 3 a idc2 ? 3.31a ? 2 ?? 20 ? rdc ? 16 m ? ? toko 12 l2 coil a916cy- 3r3m idc1 ? 2.57 a idc2 ? 2.81 a ? 3.3 ?? 20 ? rdc ? 21.4 m ? ? toko 13 l3 coil a916cy- 100m idc1 ? 1.49 a idc2 ? 1.97 a ? 10 ?? 20 ? rdc ? 41.2 m ? ? toko 14 c1 ceramic condenser c3216- jb1e225 k 25 v ?? 2.2 ?? 10 ? temperature characteristics b 3216 tdk 15 c2 ceramic condenser c3216- jb1c475 m 16 v ?? 4.7 ?? 20 ? temperature characteristics b 3216 tdk 16 c3 ceramic condenser c3216- jb1e225 k 25 v ?? 2.2 ?? 10 ? temperature characteristics b 3216 tdk 17 c4 ceramic condenser c3216- jb1c475 m 16 v ?? 4.7 ?? 20 ? temperature characteristics b 3216 tdk 18 c5 ceramic condenser c3216- jb1e225 k 25 v ?? 2.2 ?? 10 ? temperature characteristics b 3216 tdk
document number: 002-08322 rev. *a page 8 of 23 mb39a112evb-01 19 c6 ceramic condenser c3216- jb1c475 m 16 v ?? 4.7 ?? 20 ? temperature characteristics b 3216 tdk 20 c7 ceramic condenser c1608- jb1h104 k 50v ?? 0.1 ?? 10 ? temperature characteristics b 1608 tdk 21 c8 ceramic condenser c1608- jb1h223 k 50v ?? 0.022 ? ? 10 ? temperature characteristics b 1608 tdk 22 c9 ceramic condenser c1608- jb1h104 k 50v ?? 0.1 ?? 10 ? temperature characteristics b 1608 tdk 23 c10 ceramic condenser c1608ch 1h101j 50v ?? 100 p ? 5 ? temperature characteristics ch 1608 tdk 24 c11 ceramic condenser c1608- jb1h103 k 50v ?? 0.01 ?? 10 ? temperature characteristics b 1608 tdk 25 c12 ceramic condenser c1608- jb1h104 k 50v ?? 0.1 ?? 10 ? temperature characteristics b 1608 tdk 26 c13 ceramic condenser c1608- jb1h104 k 50v ?? 0.1 ?? 10 ? temperature characteristics b 1608 tdk 27 c14 ceramic condenser c1608- jb1h103 k 50v ?? 0.01 ?? 10 ? temperature characteristics b 1608 tdk 28 c15 ceramic condenser c1608- jb1h102 k 50v ?? 1000 p ? 10 ? temperature characteristics b 1608 tdk 29 c16 ceramic condenser c1608- jb1h104 k 50v ?? 0.1 ?? 10 ? temperature characteristics b 1608 tdk 30 c17 ceramic condenser c1608- jb1h104 k 50v ?? 0.1 ?? 10 ? temperature characteristics b 1608 tdk 31 r1 jumper rk73z1j 1 a ?? 0 ? max 50 m ? ? 1608 koa 32 r2 jumper rk73z1j 1 a ?? 0 ? max 50 m ? ? 1608 koa no. symbol part name model name specification package manu- facturer remarks (circuit diagram mark) rating 1 rating 2 rating 3 value devia- tion features
document number: 002-08322 rev. *a page 9 of 23 mb39a112evb-01 33 r3 jumper rk73z1j 1 a ?? 0 ? max 50 m ? ? 1608 koa 34 r4 jumper rk73z1j 1 a ?? 0 ? max 50 m ? ? 1608 koa 35 r5 jumper rk73z1j 1 a ?? 0 ? max 50 m ? ? 1608 koa 36 r6 resistor pr0816p -222-d 1/16 w ?? 2.2 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 37 r7 resistor pr0816p -183-d 1/16 w ?? 18 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 38 r8 resistor pr0816p -104-d 1/16 w ?? 100 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 39 r9 resistor pr0816p -821-d 1/16 w ?? 820 ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 40 r10 resistor pr0816p -512-d 1/16 w ?? 5.1 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 41 r11 resistor pr0816p -472-d 1/16 w ?? 4.7 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 42 r12 resistor pr0816p -563-d 1/16 w ?? 56 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 43 r13 resistor pr0816p -363-d 1/16 w ?? 36 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 44 r14 resistor pr0816p -821-d 1/16 w ?? 820 ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 45 r15 resistor pr0816p -681-d 1/16 w ?? 680 ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 46 r16 resistor pr0816p -303-d 1/16 w ?? 30 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 47 r17 resistor pr0816p -103-d 1/16 w ?? 10 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 48 r18 resistor pr0816p -102-d 1/16 w ?? 1 k ? ? 0.5 ? ? 25 ppm/ ? c 1608 ssm 49 r19 resistor ?????? ? ? ? not mounted 50 r20 resistor ?????? ? ? ? not mounted 51 r21 resistor ?????? ? ? ? not mounted 52 sw1 switch dms-4h ????? ? ? mat- sukyu no. symbol part name model name specification package manu- facturer remarks (circuit diagram mark) rating 1 rating 2 rating 3 value devia- tion features
document number: 002-08322 rev. *a page 10 of 23 mb39a112evb-01 7. initial settings 7.1 output voltage 7.2 oscillation frequency 7.3 soft-start time ch1 : ts1 (s) ? 1.0 ? c7 ( ? f) ? 10 (ms) ch2 : ts2 (s) ? 0.123 ? c12 ( ? f) ? 12 (ms) ch3 : ts3 (s) ? 0.123 ? c13 ( ? f) ? 12 (ms) 7.4 short-circuit detection time tscp (s) ? 0.72 ? c15 ( ? f) ? 720 ( ? s) 53 ? terminal pin wt-2-1 ????? ? ? maceight sanyo sanyo electric co., ltd. toko toko, inc. tdk tdk corporation koa koa corporation ssm susumu co., ltd. matsukyu matsukyu co., ltd. maceight maceight co., ltd. ch1 : v o 1 (v) ? r6 ? r7 ? r8 ? 1.0 ? 1.2 v r8 ch2 : v o 2 (v) ? r11 ? r12 ? r13 ? 1.23 ? 3.3 v r13 ch3 : v o 3 (v) ? r15 ? r16 ? r17 ? 1.23 ? 5 v r17 f osc (khz) ? 1200000 ? 2350 (khz) c10 (pf) ? r10 (k ? ) no. symbol part name model name specification package manu- facturer remarks (circuit diagram mark) rating 1 rating 2 rating 3 value devia- tion features
document number: 002-08322 rev. *a page 11 of 23 mb39a112evb-01 8. reference data 8.1 conversion efficiency vs. input voltage 100 90 80 70 60 50 40 30 20 10 100 1000 10000 vin = 12 v setting v o 1 = 1.2 v sw1 = on sw2 = off sw3 = off 100 90 80 70 60 50 40 30 20 10 100 1000 10000 vin = 12 v setting v o 2 = 3.3 v sw1 = off sw2 = on sw3 = off 100 90 80 70 60 50 40 30 20 10 100 1000 vin = 12 v setting v o 3 = 5.0 v sw1 = off sw2 = off sw3 = on ? ch1 conversion efficiency vs. load current (ch1) conversion efficiency ? ( ? ) load current io1 (ma) conversion efficiency vs. load current (ch2) conversion efficiency ? ( ? ) load current io2 (ma) conversion efficiency vs. load current (ch3) conversion efficiency ? ( ? ) load current io3 (ma) ? ch2 ? ch3
document number: 002-08322 rev. *a page 12 of 23 mb39a112evb-01 8.2 load reguration (v in ? 12 v) 1.5 1.4 1.3 1.2 1.1 1 10 100 1000 10000 vin = 12 v setting v o 1 = 1.2 v sw1 = on sw2 = off sw3 = off 3.5 3.4 3.3 3.2 3.1 3 10 100 1000 10000 vin = 12 v setting v o 2 = 3.3 v sw1 = off sw2 = on sw3 = off 5.3 5.2 5.1 5 4.9 4.8 10 100 1000 vin = 12 v setting v o 3 = 5.0 v sw1 = off sw2 = off sw3 = on ? ch1 ? ch2 ? ch3 output voltage vs. load current (ch1) output voltage vo1 (v) load current io1 (a) output voltage vs. load current (ch2) output voltage vo2 (v) load current io2 (a) output voltage vs. load current (ch3) output voltage vo3 (v) load current io3 (a)
document number: 002-08322 rev. *a page 13 of 23 mb39a112evb-01 8.3 line regulation 1.5 1.4 1.3 1.2 1.1 1 6 8 10 12 14 16 18 20 22 vin = 12 v setting v o 1 = 1.2 v sw1 = on sw2 = off sw3 = off 3.5 3.4 3.3 3.2 3.1 3 6 8 10 12 14 16 18 20 22 vin = 12 v setting v o 2 = 3.3 v sw1 = off sw2 = on sw3 = off 5.3 5.2 5.1 5 4.9 4.8 6 8 10 12 14 16 18 20 22 vin = 12 v setting v o 3 = 5.0 v sw1 = off sw2 = off sw3 = on ? ch1 output voltage vs. input voltage (ch1) output voltage vo1 (v) input voltage v in (v) ? ch2 output voltage vs. input voltage (ch2) output voltage vo2 (v) input voltage v in (v) ? ch3 output voltage vs. input voltage (ch3) output voltage vo3 (v) input voltage v in (v)
document number: 002-08322 rev. *a page 14 of 23 mb39a112evb-01 8.4 soft-start operation waveforms cs1 [v] v o 1 [v] 3 2 1 0 2.0 1.5 1.0 0.5 0 0 5 10 15 20 25 30 35 40 45 50 (ms) vin = 12 v setting v o 1 = 1.2 v cs2 [v] v o 2 [v] 3 2 1 0 4 3 2 1 0 0 5 10 15 20 25 30 35 40 45 50 (ms) vin = 12 v setting v o 2 = 3.3 v cs3 [v] v o 3 [v] 3 2 1 0 6 4 2 0 0 5 10 15 20 25 30 35 40 45 50 (ms) vin = 12 v setting v o 3 = 5.0 v ? ch1 ? ch2 ? ch3 ? 10.6 ms ? 12.7 ms ? 13.2 ms
document number: 002-08322 rev. *a page 15 of 23 mb39a112evb-01 9. component selection methods figure 1. board photograph mb39a112 es0309 m00 222 183 0 104 821 0 0 0 0 2r0 3r3 100 jm sa 1 j4 sa 1 j4 sd 8 l3 jm jh 512 821 563 363 102 103 303 681 472 1 off mcc 234 ctl1 q4 r6 gnd vin r4 r1 c2 c1 d1 q1 1 3 6 4 c17 c16 m1 fb1 fb3 cscp fb2 cs2 cs3 r14 r15 cs l cs open sw1 sgnd r16 c14 c15 11 20 vcc vcco out2 vh out1 vd1 vo1 gnd1 vo2 gnd2 vo3 gnd3 l1 r2 c4 c3 d2 q2 1 3 6 4 vd2 l2 r3 c6 c5 d3 q3 3 2 1 vd3 l3 out3 r9 1 10 r13 r11 r17 r18 c8 c9 c10 r10 r7 r1 2 c12 nc cs3 cs2 cs1 q5 q6 ctl2 ctl3 r1 9 r8 cs1 c7 r5 c11 c13 r2 0 r2 1 1234 fet flyback diode inductor output smoothing condenser output smoothing condenser fet ch1 ch2 inductor flyback diode output smoothing condenser ch3 inductor flyback diode fet
document number: 002-08322 rev. *a page 16 of 23 mb39a112evb-01 9.1 ch1 1.2 v output v in ? 12 v (typ) , vo1 ? 1.2 v, io ? 1.5 a, f osc ? 2300 khz 9.1.1 p-ch mos fet (mch3312 (sanyo product) ) v ds ? ? 30 v, v gs ? ? 20 v, i d ? ? 2 a, r ds (on) ? 205 m ? (typ) , qg ? 5.5 nc (typ) drain current : peak value the peak drain current of this fet must be within its rated current. if the fet?s peak drain current is i d , it is obtained by the following formula. 9.1.2 inductor (a916cy-2r0m : toko product) 2.0 ? h (tolerance ? 20 ? ) , rated current ? 3.0 a the l value for all load current conditions it is set so that the peak to peak value of the ri pple current is 1/2 of the load current or less. the load current satisfying the continuous current condition i d ? i o ? v in ? vo1 t on 2l ? 1.5 ? 12 ? 1.2 ? 1 ? 0.1 2 ? 2 ? 10 ? 6 2300 ? 10 3 ? 1.62 a l ? 2 (v in ? vo1) t on i o ? 2 ? (12 ? 1.2) ? 1 ? 0.1 1.5 2300 ? 10 3 ? 0.63 ? h i o ? vo1 t off 2l ? 1.2 ? 1 ? (1 ? 0.1) 2 ? 2.0 ? 10 ? 6 2300 ? 10 3 ? 0.12 a
document number: 002-08322 rev. *a page 17 of 23 mb39a112evb-01 ripple current : peak value the peak ripple current must be within the rated current of the inductor. if the peak ripple current is i l , it is obtained by the following formula. ripple current : peak-to-peak value if the peak-to-peak ripple current is ? i l , it is obtained by the following formula. 9.1.3 flyback diode (sbe001 : sanyo product) v r (dc reverse voltage) ? 30 v, average output current ? 2.0 a, peak surge current ? 20 a v f (forward voltage) ? 0.55 v, at i f ? 2.0 a v r : the value enough to satisfy the input voltage ? 30 v on time of the diode is assumed to be t d (max) , the diode mean current i di is obtained by the following formula. on time of the diode is assumed to be t d (max) , the diode peak current i dip is obtained by t he following formula. i l ? i o ? v in ? vo1 t on 2l ? 1.5 ? 12 ? 1.2 ? 1 ? 0.1 2 ? 2.0 ? 10 ? 6 2300 ? 10 3 ? 1.62 a ? i l ? v in ? vo1 t on l ? 12 ? 1.2 ? 1 ? 0.1 2.0 ? 10 ? 6 2300 ? 10 3 ? 0.23 a i di ? io ? (1 ? vo1 ) ? 1.5 ? (1 ? 0.1) ? 1.35 a v in i dip ? (io ? vo1 t off ) ? 1.62 a 2l
document number: 002-08322 rev. *a page 18 of 23 mb39a112evb-01 9.2 ch2 3.3 v output v in ? 12 v (typ) , vo2 ? 3.3 v, io ? 1.0 a, f osc ? 2300 khz 9.2.1 p-ch mos fet (mch3312 (sanyo product) ) v ds ? ? 30 v, v gs ? ? 20 v, i d ? ? 2 a, r ds (on) ? 205 m ? (typ) , qg ? 5.5 nc (typ) drain current : peak value the peak drain current of this fet must be within its rated current. if the fet?s peak drain current is i d , it is obtained by the following formula. 9.2.2 inductor (a916cy-3r3m : toko product) 3.3 ? h (tolerance ? 20 ? ) , rated current ? 2.57 a the l value for all load current conditions it is set so that the peak to peak value of the ri pple current is 1/2 of the load current or less. the load current satisfying the continuous current condition i d ? i o ? v in ? vo2 t on 2l ? 1.0 ? 12 ? 3.3 ? 1 ? 0.275 2 ? 3.3 ? 10 ? 6 2300 ? 10 3 ? 1.16 a l ? 2 (v in ? vo2) t on i o ? 2 ? (12 ? 3.3) ? 1 ? 0.275 1.0 2300 ? 10 3 ? 2.08 ? h i o ? vo2 t off 2l ? 3.3 ? 1 ? (1 ? 0.275) 2 ? 3.3 ? 10 ? 6 2300 ? 10 3 ? 0.16 a
document number: 002-08322 rev. *a page 19 of 23 mb39a112evb-01 ripple current : peak value the peak ripple current must be within the rated current of the inductor. if the peak ripple current is i l , it is obtained by the following formula. ripple current : peak-to-peak value if the peak-to-peak ripple current is ? i l , it is obtained by the following formula. 9.2.3 flyback diode (sbe001 : sanyo product) v r (dc reverse voltage) ? 30 v, average output current ? 2.0 a, peak surge current ? 20 a v f (forward voltage) ? 0.55 v, at i f ? 2.0 a v r : the value enough to satisfy the input voltage ? 30 v on time of the diode is assumed to be t d (max) , the diode mean current i di is obtained by the following formula. on time of the diode is assumed to be t d (max) , the diode peak current i dip is obtained by t he following formula. i l ? i o ? v in ? vo2 t on 2l ? 1.0 ? 12 ? 3.3 ? 1 ? 0.275 2 ? 3.3 ? 10 ? 6 2300 ? 10 3 ? 1.16 a ? i l ? v in ? vo2 t on l ? 12 ? 3.3 ? 1 ? 0.275 3.3 ? 10 ? 6 2300 ? 10 3 ? 0.315 a i di ? io ? (1 ? vo2 ) ? 1.0 ? (1 ? 0.275) ? 0.725 a v in i dip ? (io ? vo2 t off ) ? 1.16 a 2l
document number: 002-08322 rev. *a page 20 of 23 mb39a112evb-01 9.3 ch3 5 v output v in ? 12 v (typ) , vo3 ? 5 v, io ? 0.3 a, f osc ? 2300 khz 9.3.1 p-ch mos fet (mch3308 (sanyo product) ) v ds ? ? 30 v, v gs ? ? 20 v, i d ? ? 1 a, r ds (on) ? 720 m ? (typ) , qg ? 2.6 nc (typ) drain current : peak value the peak drain current of this fet must be within its rated current. if the fet?s peak drain current is i d , it is obtained by the following formula. 9.3.2 inductor (a916cy-100m : toko product) 10 ? h (tolerance ? 20 ? ) , rated current ? 1.49 a the l value for all load current conditions it is set so that the peak to peak value of the ri pple current is 1/2 of the load current or less. the load current satisfying the continuous current condition i d ? i o ? v in ? vo3 t on 2l ? 0.3 ? 12 ? 5 ? 1 ? 0.417 2 ? 10 ? 10 ? 6 2300 ? 10 3 ? 0.36 a l ? 2 (v in ? vo3) t on i o ? 2 ? (12 ? 5) ? 1 ? 0.417 0.3 2300 ? 10 3 ? 8.46 ? h i o ? vo3 t off 2l ? 5 ? 1 ? (1 ? 0.417) 2 ? 10 ? 10 ? 6 2300 ? 10 3 ? 63.4 ma
document number: 002-08322 rev. *a page 21 of 23 mb39a112evb-01 ripple current : peak value the peak ripple current must be within the rated current of the inductor. if the peak ripple current is i l , it is obtained by the following formula. ripple current:peak-to-peak value if the peak-to-peak ripple current is ? i l , it is obtained by the following formula. 9.3.3 flyback diode (sbs005 : sanyo product) v r (dc reverse voltage) ? 30 v, average output current ? 1.0 a, peak surge current ? 10 a v f (forward voltage) ? 0.35 v, at i f ? 0.5 a v r : the value enough to satisfy the input voltage ? 30 v on time of the diode is assumed to be t d (max) , the diode mean current i di is obtained by the following formula. on time of the diode is assumed to be t d (max) , the diode peak current i dip is obtained by t he following formula. 10. ordering information i l ? i o ? v in ? vo3 t on 2l ? 0.3 ? 12 ? 5 ? 1 ? 0.417 2 ? 10 ? 10 ? 6 2300 ? 10 3 ? 0.36 a ? i l ? v in ? vo3 t on l ? 12 ? 5 ? 1 ? 0.417 10 ? 10 ? 6 2300 ? 10 3 ? 0.127 a i di ? io ? (1 ? vo3 ) ? 0.3 ? (1 ? 0.417) ? 0.175 a v in i dip ? (io ? vo2 t off ) ? 0.36 a 2l ev board part no. ev board version no. remarks mb39a112evb-01 mb39a112ev board rev 1.0
document number: 002-08322 rev. *a page 22 of 23 mb39a112evb-01 document history page spansion publication number: ds04-71109-1e document title: mb39a112evb-01, power supply application evaluation board datasheet document number: 002-08322 revision ecn orig. of change submission date description of change ** - taoa 05/26/2004 migrated to cypress and assigned document number 002-08322. no change to document contents or format. *a 5522626 taoa 11/22/2016 updated to cypress template
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