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International Rectifier IRDC3847-P1V2 User Manual

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SupIRBuck
USER GUIDE FOR IR3847 EVALUATION BOARD
DESCRIPTION
The
IR3847
is
a
converter,
providing
performance and flexible solution in a small
5mmx6mm QFN package.
Key features offered by the IR3847 include
internal Digital Soft Start, precision 0.6V
reference voltage, Power Good, thermal
protection,
programmable
frequency, Enable input, input under-voltage
lockout for proper start-up, enhanced line/
load regulation with feed forward, external
frequency
synchronization
clocking, internal LDO, true differential
remote sensing and pre-bias start-up.

BOARD FEATURES

•
V
= +12V (+ 13.2V Max), No Vcc required.
in
• V
= +1.2V @ 0- 25A
out
•
F
=1000kHz
s
•
L= 0. 15uH
•
C
= 5x22uF (ceramic 1206) + 1x330uF (electrolytic)
in
•
C
=7x22uF (ceramic 0805)
out
2/13/2012
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
TM
synchronous
buck
a
compact,
high
switching
with
smooth
IRDC3847-P1V2
A thermally compensated output over-current
protection function is implemented by sensing
the voltage developed across the on-resistance
of the synchronous rectifier MOSFET for
optimum cost and performance.
This user guide contains the schematic and bill
of materials for the IR3847 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed
information for IR3847 is available in the
IR3847 data sheet.
Confidential
application
1

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Summary of Contents for International Rectifier IRDC3847-P1V2

  • Page 1: Board Features

    IRDC3847-P1V2 SupIRBuck USER GUIDE FOR IR3847 EVALUATION BOARD DESCRIPTION A thermally compensated output over-current IR3847 synchronous buck protection function is implemented by sensing converter, providing compact, high the voltage developed across the on-resistance performance and flexible solution in a small of the synchronous rectifier MOSFET for 5mmx6mm QFN package.
  • Page 2 IRDC3847-P1V2 CONNECTIONS and OPERATING INSTRUCTIONS A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum of 25A load should be connected to VOUT+ and VOUT-. The inputs and output connections of the board are listed in Table I.

  • Page 3: Top View

    IRDC3847-P1V2 CONNECTIONS and OPERATING INSTRUCTIONS LAYOUT The PCB is a 6-layer board. All of layers are 2 Oz. copper. The IR3847 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 IR3847. The feedback resistors are connected to the output of the remote sense amplifier of the IR3847 and are located close to the IR3847.
  • Page 4 IRDC3847-P1V2 2/13/2012 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...
  • Page 5 IRDC3847-P1V2 Schematic for Transient Load set up Vout ExtLoadCtrl Vo_R_P Vout IRF6721 N/S OUT2 OUT1 22uF MIC4452/SO8 N/S I-Monitor Vo_R_N Optional transient load circuit 2/13/2012 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3847. Based on the results of the...

  • Page 6: Bill Of Materials

    IRDC3847-P1V2 Bill of Materials Item Quantity Part Reference Value Description Manufacturer Part Number 5 C2 C3 C4 C5 C57 22uF 22uF,1206,16V, X5R, 20% Panasonic ECJ3YB1C226M SMD Elecrolytic, Fsize, 25V, 1 C1 330uF Panasonic EEV-FK1E331P C9 C14 C24 C25 C37 C33 0.1uF...
  • Page 7 IRDC3847-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=0A-25A, 1MHz, Room Temperature, no airflow Fig. 2: Start up at 25A Load Fig. 3: Start up at 25A Load, , Ch , Ch :PGood, Ch :Enable , Ch , Ch PGood Fig. 4: Start up with 1.08V Pre Bias , 0A Load, Ch Fig.
  • Page 8 IRDC3847-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=2.5A-10A, 1MHz, Room Temperature, no air flow Fig. 8: Transient Response, 2.5A to 10A step (2.5A/us) 2/13/2012 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3847. Based on the results of the...
  • Page 9 IRDC3847-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=17.5A-25A, 1MHz, Room Temperature, no air flow Fig. 9: Transient Response, 17.5A to 25A step (2.5A/us) 2/13/2012 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3847. Based on the results of the...
  • Page 10 IRDC3847-P1V2 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 2/13/2012 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3847. Based on the results of the...
  • Page 11 IRDC3847-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=0A-25A, Room Temperature, no air flow Fig.11: Efficiency versus load current Fig.12: Power loss versus load current 2/13/2012 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3847. Based on the results of the...
  • Page 12 IRDC3847-P1V2 THERMAL IMAGES Vin=12.0V, Vo=1.2V, Io=0A-25A, 1MHz, Room Temperature, No airflow Fig. 13: Thermal Image of the board at 25A load Test point 1 is IR3847: 103 Test point 2 is inductor: 70 2/13/2012 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3847. Based on the results of the...