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International Rectifier IRDC3847-P1V2, User Manual, Page: 10 / 12

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International Rectifier IRDC3847-P1V2 User Manual Download Page 10

IRDC3847-P1V2

Confidential

This evaluation board is a preliminary version meant for the engineering evaluation of the  IR3847. Based on the results of the 
continuing evaluation, this board  can evolve and change without notice

2/13/2012

10

TYPICAL OPERATING WAVEFORMS
Vin=12.0V, Vo=1.2V, Io=0A-25A, 1MHz, Room Temperature, No air flow

Fig. 10: Bode Plot at 25A load shows a bandwidth of 170kHz and phase margin of 51degrees

Summary of Contents for IRDC3847-P1V2

Page 1: ...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 up...

Page 2: ...Vcc operation by installing R35 This version of the demoboard was built with a previous revision of the IR3847 for which Vp was pin 14 and Vref was pin 15 However in the new revision these pins have...

Page 3: ...ts are mounted on the top side of the board Power supply decoupling capacitors and feedback components are located close to IR3847 The feedback resistors are connected to the output of the remote sens...

Page 4: ...2 67K C4 22uF C15 22uF R6 20 C16 22uF R31 0 ohm R8 0 C17 22uF C35 N S C18 22uF R30 0 ohm C19 22uF PGD U1 IR3847 Vin 17 LGnd 11 Rt Sy nc 4 SW 22 Vcc 18 Comp 8 Vsns 6 PGnd 26 OCSelect 5 FB 7 Boot 2 PGD...

Page 5: ...hout notice 2 13 2012 5 Schematic for Transient Load set up Vout N S R38 N S C65 N S C59 N S C58 N S C64 N S C46 N S R22 N S R23 N S R24 N S R25 N S R45 N S ExtLoadCtrl 1 M1 IRF6721 N S U2 MIC4452 SO8...

Page 6: ...est connector Tektronix 131 5031 00 8 1 C26 10nF 0603 50V X7R 10 Panasonic ECJ 1VB1H103K 9 1 L1 0 150uH 0 150uH DCR 0 29mohm Cyntec PCDC1008 R150EMO 10 1 R1 1K 0603 1 10W 1 Rohm MCR03EZPFX1001 11 1 R2...

Page 7: ...ut notice 2 13 2012 7 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0A 25A 1MHz Room Temperature no airflow Fig 5 Output Voltage Ripple 25A load Ch1 Vout Fig 6 Inductor node at 25A load Ch2 LX Fig...

Page 8: ...eering evaluation of the IR3847 Based on the results of the continuing evaluation this board can evolve and change without notice 2 13 2012 8 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 2 5A 10A...

Page 9: ...ering evaluation of the IR3847 Based on the results of the continuing evaluation this board can evolve and change without notice 2 13 2012 9 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 17 5A 25A...

Page 10: ...tion of the IR3847 Based on the results of the continuing evaluation this board can evolve and change without notice 2 13 2012 10 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0A 25A 1MHz Room Temp...

Page 11: ...g evaluation of the IR3847 Based on the results of the continuing evaluation this board can evolve and change without notice 2 13 2012 11 Fig 12 Power loss versus load current Fig 11 Efficiency versus...

Page 12: ...on of the IR3847 Based on the results of the continuing evaluation this board can evolve and change without notice 2 13 2012 12 THERMAL IMAGES Vin 12 0V Vo 1 2V Io 0A 25A 1MHz Room Temperature No airf...

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