IRDC3710-QFN International Rectifier, IRDC3710-QFN Datasheet - Page 2

• Manufacturer Part Number: IRDC3710-QFN
• Description: BOARD EVAL SYNC BUCK CONTROLLER
• Manufacturer: International Rectifier

Specifications of IRDC3710-QFN

• Lead Free Status / Rohs Status: Supplier Unconfirmed

LAYOUT
The PCB is a 4-layer board. All layers are 2 Oz. copper. The IR3710M and other components are mounted
on the top and bottom side of the board.
Power supply decoupling capacitors, the Bootstrap capacitor and feedback components are located close
to IR3710M. The feedback resistors are connected to the output voltage at the point of regulation and are
located close to IR3710M. 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 regulated +12V input supply should be connected to VIN+ and Vin-. A maximum 20A 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.
IRDC3710-QFN has three input connectors, one for gate drive supply (PVcc),one for biasing (Vcc) and the
third one as input voltage (Vin). Separate supplies should be applied to these inputs. PVcc input should be
a well regulated 4.5V-5.5V supply and it would be connected to +5V and GROUND and Vcc input should be
a well regulated 3.0V-3.6V supply and it would be connected to +3.3V and GROUND. An external signal
can be provided as Enable signal to turn on or turn off the converter if desired. This signal is not required to
power up the Evaluation board as EN pin is connected to a voltage divider from Vin. The absolute maximum
voltage of Enable signal is +3.9V.
The evaluation board is configured for use with 2x10uF (ceramic 1206) + 3x330uF (SP) capacitors.
However, the design can be modified for an all ceramic output cap configuration by adding the inductor
DCR sensing circuit as show in the schematic.
Connection
VIN+
VIN-
+5V
+3.3V
GROUND
VOUT+
VOUT+
Enable
Table 1: Connections
Signal Name
VIN (+12V)
Ground of VIN
PVcc input (+5.0V)
Vcc input (+3.3V)
Ground for PVcc and Vcc input
V
Ground of V
Enable input
out
(+1.1V)
out
IRDC3710-QFN
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