IRDC3629A International Rectifier, IRDC3629A Datasheet - Page 2

• Manufacturer Part Number: IRDC3629A
• Description: BOARD EVAL SYNC BUCK CONTROLLER
• Manufacturer: International Rectifier

LAYOUT
The PCB is a 6-layer board. All of layers are 2 Oz. copper. Power supply decoupling capacitors, the charge-
pump capacitor and feedback components are located close to the IR3629A. The feedback resistors are
connected to the output voltage at the point of regulation and are located close to the IC.
The input and output energy storage capacitors and the power inductor are located on bottom side of the
board, 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-.
connected to VOUT+ and VOUT-. The connection diagram is shown in Fig. 1
IR3629A demo board can also be powered by two separate power supplies, one is the input voltage (Vin)
between VIN+ and VIN-, the other is bias voltage (Vcc) between Vc-ext and PGND. In this case, a well
regulated 5V~12V power supply should be connected to Vc-ext and PGND and R14 should be removed.
Inputs and outputs of the board are listed in Table I.
Connection
VIN+
VIN-
Vc-ext
PGND
VOUT-
VOUT+
GND
Table I. Connections
Signal Name
V
Ground of V
Optional Vcc input
Ground for optional Vcc input
Ground of V
V
Bias Voltage Ground
in
out
(+12V)
(+1.8V)
in
out
A maximum of 20A load can be
IRDC3629A
2