IRDC3802 International Rectifier, IRDC3802 Datasheet - Page 2

• Manufacturer Part Number: IRDC3802
• Manufacturer: International Rectifier

Specifications of IRDC3802

• Lead Free Status / RoHS Status: Supplier Unconfirmed

LAYOUT
The PCB is a 4-layer board. All of layers are 2 Oz. copper. The IR3802A SupIRBuck and all of
the passive components are mounted on the bottom side of the board. The Inductor, Input and
Output Bulk Capacitors are located on the top side of the board.
Power supply decoupling capacitors, the charge-pump capacitor and feedback components are
located close to IR3802A. The feedback resistors are connected to the output voltage at the point
of regulation and are located close to the SupIRBuck.
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-.
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.
IR3802 has two input supplies, one for biasing (Vcc) and the other as input voltage (Vin). These
inputs are connected on the board with a 330 ohm resistor (R13). Separate supplies can be applied
to these inputs.
regulated 5V-12V supply and it would be connected to Vcc+ and Vcc-.
Rev 0.1
6/16/2008
Vcc input cannot be connected unless R13 is removed.
Connection
VIN+
VIN-
Vcc+
Vcc-
VOUT-
VOUT+
Table I. Connections
Signal Name
V
Ground of V
Optional Vcc input
Ground for Optional Vcc input
Ground of V
V
in
out
(+12V)
(+3.3V)
in
out
Vcc input should be a well
IRDC3802
A maximum 4A load
2