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

5 / 5 page

USR1101

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

5 of 5

www.unisonic.com.tw

QW-R103-062.b



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

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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