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IRDC3894-P1V2 Datasheet(PDF) 2 Page - International Rectifier

Part # IRDC3894-P1V2
Description  USER GUIDE FOR IR3894 EVALUATION BOARD
Download  14 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IRDC3894-P1V2 Datasheet(HTML) 2 Page - International Rectifier

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IRDC3894-P1V2
12/22/2011
2
CONNECTIONS AND OPERATING INSTRUCTIONS
Table I. Connections
Connection
Signal Name
VIN+
Vin (+12V)
VIN-
Ground of Vin
Vout+
Vout(+1.2V)
Vout-
Ground for Vout
Vcc+
Vcc/ LDO_out Pin
Vcc-
Ground for Vcc input
Enable
Enable
PGood
Power Good Signal
Gnd
Analog ground
A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum of 12A load should
be connected to VOUT+ and VOUT-. The input and output connections of the board are listed in Table I.
IR3894 has only one input supply and internal LDO generates Vcc from Vin. If operation with external Vcc
is required, then R15 can be removed and external Vcc can be applied between Vcc+ and Vcc- pins. Vin pin
and Vcc/LDOout pins should be shorted together for external Vcc operation (use zero ohm resistor for R29).
The output can track voltage at the Vp pin. For this purpose, Vref pin is to be connected to ground (use zero
ohm resistor for R21). The value of R14 and R28 can be selected to provide the desired tracking ratio
between output voltage and the tracking input.
LAYOUT
The PCB is a 4-layer board (2.23”x2”) using FR4 material. All layers use 2 Oz. copper. The PCB
thickness is 0.062”. The IR3894 and other major power components are mounted on the top side of the
board.
Power supply decoupling capacitors, the bootstrap capacitor and feedback components are located
close to IR3894. The feedback resistors are connected to the output at the point of regulation and are
located close to the SupIRBuck IC. To improve efficiency, the circuit board is designed to minimize the
length of the on-board power ground current path.


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