2

IRDC3629

A well regulated +12V input supply should be connected to VIN+ and VIN-.

A maximum of 20A load can be

connected to VOUT+ and VOUT-. The connection diagram is shown in Fig. 1

IR3629 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.

Table I. Connections

Optional Vcc input

Vc-ext

Ground for optional Vcc input

PGND

Bias Voltage Ground

GND

V

VOUT+

Ground of V

out

VOUT-

Ground of V

in

VIN-

V

VIN+

Signal Name

Connection

CONNECTIONS and OPERATING INSTRUCTIONS

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 IR3629. 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.