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International Rectifier SupIRBuck IRDC3846, User Manual, Page: 5 / 14

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International Rectifier SupIRBuck IRDC3846 User Manual Download Page 5

IRDC3846-P1V2

Confidential

This evaluation board is a preliminary version meant for the engineering evaluation of the  IR3846. Based on the results 
of the continuing evaluation, this board  can evolve and change without notice

AL

4/11/2013

5

Schematic for Transient Load set up

N/S

R33
N/S

Vout

C30
N/S

R34

N/S

R35

N/S

R36

N/S

R37

N/S

ExtLoadCtrl

1

M1

IRF6721 N/S

U2

MIC4452/SO8 N/S

VS

1

IN

2

GND

4

GND

5

OUT1

6

OUT2

7

VS

8

N/A

3

R30

N/S

R32
N/S

S3

SW

2

1

3

C33
N/S

C31
N/S

R31
N/S

Vout

C32
N/S

Vo_R_P

D4
N/S

D3

N/S

R38

N/S

R39

N/S

Vo_R_N

Optional transient load circuit

VCC

I-Monitor

1

Summary of Contents for SupIRBuck IRDC3846

Page 1: ...e lockout for proper start up enhanced line load regulation with feed forward external frequency synchronization with smooth clocking internal LDO true differential remote sensing and pre bias start u...

Page 2: ...R18 should be uninstalled and R19 should be installed instead External Enable signal can be applied to the board via exposed Enable pad and R100 should be removed for this purpose CONNECTIONS and OPER...

Page 3: ...846 and most of the passive components are mounted on the top side of the board Power supply decoupling capacitors and feedback components are located close to IR3846 The feedback resistors are connec...

Page 4: ...s 8 RT Sy nc 6 Enable 5 OCset 7 NC1 2 RS 16 PVin 1 Comp 10 PGND 12 LGND 13 FB 9 VCC 21 NC4 23 Vin 20 SW 24 S_Ctrl 14 RS 15 NC2 3 PGD 19 NC5 26 R115 0 C105 100uF C125 N S PVin C73 22uF C70 0 1uF BODE2...

Page 5: ...volve and change without notice AL 4 11 2013 5 Schematic for Transient Load set up N S R33 N S Vout C30 N S R34 N S R35 N S R36 N S R37 N S ExtLoadCtrl 1 M1 IRF6721 N S U2 MIC4452 SO8 N S VS 1 IN 2 GN...

Page 6: ...V FK1E331P 10 1 L1 250nH 250nH DCR 0 165mohm Wurth Electronics Inc 744309025 11 6 C101 C102 C103 C104 C105 C106 100uF 1206 6 3V X5R 20 Murata GRM31CR60J107ME39L 12 6 R3 R10 R18 R115 R116 R118 0 0603 1...

Page 7: ...4 11 2013 7 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0A 35A Fsw 600kHz Room Temperature No air flow Fig 5 Output Voltage Ripple 35A load Ch1 Vo Fig 6 Inductor node at 35A load Ch2 LX Fig 7 Sho...

Page 8: ...ing evaluation of the IR3846 Based on the results of the continuing evaluation this board can evolve and change without notice AL 4 11 2013 8 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 3 5A 14A...

Page 9: ...g evaluation of the IR3846 Based on the results of the continuing evaluation this board can evolve and change without notice AL 4 11 2013 9 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 24 5A 35 0A...

Page 10: ...tion of the IR3846 Based on the results of the continuing evaluation this board can evolve and change without notice AL 4 11 2013 10 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0A 35A Fsw 600kHz...

Page 11: ...lve and change without notice AL 4 11 2013 11 Fig 12 Power loss versus load current Fig 11 Efficiency versus load current TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0A 35A Fsw 600kHz Room Temper...

Page 12: ...the IR3846 Based on the results of the continuing evaluation this board can evolve and change without notice AL 4 11 2013 12 THERMAL IMAGES Vin 12 0V Vo 1 2V Io 35A Fsw 600kHz Room Temperature No air...

Page 13: ...of the IR3846 Based on the results of the continuing evaluation this board can evolve and change without notice AL 4 11 2013 13 THERMAL IMAGES Vin 12 0V Vo 1 2V Io 35A Fsw 600kHz Room Temperature LFM...

Page 14: ...on the results of the continuing evaluation this board can evolve and change without notice AL 4 11 2013 14 IR WORLD HEADQUARTERS 233 Kansas St El Segundo California 90245 USA Tel 310 252 7105 TAC Fa...

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