USR1101G-S08-R datasheet(5/6 Pages) UTC

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USR1101

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

5 of 6

www.unisonic.com.tw

QW-R103-062.a

APPLICATION INFORMATION

OCP

Sense the low-side MOSFET’s RDS(ON) to set over-current trip point.

Connecting a resistor (ROCSET) from this pin to the source of the upper MOSFET and the drain of the lower

MOSFET sets the over-current trip point. ROCSET, an internal 40μA current source, and the lower MOSFET on

resistance, RDS(ON), set the converter over-current trip point (IOCSET) according to the following equation:

MOSFET

lower

the

0.4V

DS(ON)

OCSET

−

Shutdown

Pulling low the OPS pin by a small single transistor can shutdown the UTC USR1101 PWM controller as shown in

typical application circuit.

TYPICAL APPLICATION CIRCUIT

BOOT

COUT

1000µF×3

0.1µF

1µF

470µF

VIN

+5V~+12V

1N4148

1µF

3µH

VOUT

200-1k

0.1-0.33µF

VCC

GND

LGATE

OPS

UGATE

Disable

ROCSET

UTC USR1101

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