IRDC3820 International Rectifier, IRDC3820 Datasheet - Page 2

BOARD EVAL SYNC BUCK CONVERTER

IRDC3820

Manufacturer Part Number
IRDC3820
Description
BOARD EVAL SYNC BUCK CONVERTER
Manufacturer
International Rectifier
Datasheets

Specifications of IRDC3820

Silicon Manufacturer
International Rectifier
Kit Application Type
Power Management - Voltage Regulator
Application Sub Type
Synchronous Buck Converter
Features
Programmable Soft Start, Programmable
Rohs Compliant
Yes
LAYOUT
The PCB is a 4-layer board. All of layers are 2 Oz. copper. IR3820 and all of the passive components
are mounted on the top side of the board.
Power supply decoupling capacitors, the charge-pump capacitor and feedback components are located
close to IR3820. The feedback resistors are connected to the output voltage at the point of regulation
and are located close to IR3820.
To improve efficiency, the circuit board is designed to minimize the length of the on-board power ground
current path.
CONNECTIONS and OPERATING INSTRUCTIONS
A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum 12A load should
be connected to VOUT+ and VOUT-. The connection diagram is shown in Fig. 1 and inputs and outputs of
the board are listed in Table I.
IR3820 has two input supplies, one for biasing (Vcc) and the other as input voltage (Vin). These inputs are
connected on the board with a zero ohm resistor (R15). Separate supplies can be applied to these inputs.
Vcc input cannot be connected unless R15 is removed.
and it would be connected to Vcc+ and Vcc-.
Rev 0.0
01/07/2008
Connection
VIN+
VIN-
Vcc+
Vcc-
VOUT-
VOUT+
P_Good
Table I. Connections
Signal Name
V
Ground of V
Optional Vcc input
Ground for Optional Vcc input
Ground of V
V
Power Good Signal
in
out
(+12V)
(+1.8V)
Vcc input should be a well regulated 5V-12V supply
in
out
IRDC3820
2

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