IR1168S

www.irf.com

© 2009 International Rectifier

11

Detailed Pin Description

VCC: Power Supply

This is the supply voltage pin of the IC and it is monitored by the under voltage lockout circuit. It is possible to turn

off the IC by pulling this pin below the minimum turn off threshold voltage, without damage to the IC.

To prevent noise problems, a bypass ceramic capacitor connected to Vcc and COM should be placed as close as

possible to the IR1168. This pin is not internally clamped.

GND: Ground

This is ground potential pin of the integrated control circuit. The internal devices and gate driver are referenced to

this point.

VD1 and VD2: Drain Voltage Sense

These are the two high-voltage pins used to sense the drain voltage of the two SR power MOSFETs. Routing

between the drain of the MOSFET and the IC pin must be particularly optimized.

VS1 and VS2: Source Voltage Sense

These are the two differential sense pins for the two source pins of the two SR power MOSFETs. This pin must

not be connected directly to the GND pin (pin 7) but must be used to create a kelvin contact as close as possible

to the power MOSFET source pin.

GATE1 and GATE2: Gate Drive Outputs

These are the two gate drive outputs of the IC. The gate voltage is internally clamped and has a +1A/-4A peak

drive capability. Although this pin can be directly connected to the synchronous rectifier (SR) MOSFET gate, the

use of gate resistor is recommended (specifically when putting multiple MOSFETs in parallel). Care must be taken

in order to keep the gate loop as short and as small as possible in order to achieve optimal switching performance.