UNISONIC TECHNOLOGIES CO., LTD

U3848/A/B/C

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

1 of 13

Copyright © 2005 Unisonic Technologies Co., Ltd

QW-R103-033.B

HIGH PERFORMANCE

CURRENT MODE PWM

CONTROLLERS

DESCRIPTION

The UTC U3848/A/B/C is designed to provide several special

enhancements to satisfy the needs: Power-Saving mode for low

standby power, Over Current Protection (OCP), Over Voltage

Protection (OVP), Over Load Protection (OLP), Over Temperature

Protection (OTP) etc protection features. IC will be shutdown when

either protection arise and can auto-restart. Its frequency may be

8.1V. Lower typical operation current Icc 3.7mA at inactive output.

The output stage, suitable for driving N-Channel MOSFETs, can

operate to duty cycles approach 70%. The U3848/A/B/C are fully

resistor to ground to decide switch frequency, and pin FB with an

4k

Ω pull up resistor to internal reference voltage. The U3848/A/B/C

also have soft-start function avoiding overshoot, and controlled

FEATURES

* Low startup and operation current

* User defined switching frequency(Norm is 70kHz)

* Max duty cycle 70%

* Power-saving mode for low power

* Under voltage lockout with hysteresis

* Over temperature protection

* Overload protection

* Over voltage protection

* Leading edge blanking

* Soft start

DIP-8

SOP-8

*Pb-free plating product number:

U3848L/U3848AL/U3848BL/U3848CL

ORDERING INFORMATION

Order Number

Normal

Lead Free Plating

Package

Packing

U3848-D08-T

U3848L-D08-T

DIP-8

Tube

U3848-S08-R

U3848L-S08-R

SOP-8

Tape Reel

U3848-S08-T

U3848L-S08-T

SOP-8

Tube

U3848A-D08-T

U3848AL-D08-T

DIP-8

Tube

U3848A-S08-R

U3848AL-S08-R

SOP-8

Tape Reel

U3848A-S08-T

U3848AL-S08-T

SOP-8

Tube

U3848B-D08-T

U3848BL-D08-T

DIP-8

Tube

U3848B-S08-R

U3848BL-S08-R

SOP-8

Tape Reel

U3848B-S08-T

U3848BL-S08-T

SOP-8

Tube

U3848C-D08-T

U3848CL-D08-T

DIP-8

Tube

U3848C-S08-R

U3848CL-S08-R

SOP-8

Tape Reel

U3848C-S08-T

U3848CL-S08-T

SOP-8

Tube