U3848L-S08-R 查看數據表（PDF） - Unisonic Technologies

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U3848L-S08-R

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

Unisonic Technologies 

UNISONIC TECHNOLOGIES CO., LTD

U3848/A/B/C

LINEAR INTEGRATED CIRCUIT

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

defined by user through resistor RT to external ground. UVLO

featuring typical start-up current 20µA, and VCC(ON) 12.6V, VCC(OFF)

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

pin-to-pin compatible with UC3842. But pin RT only connected a

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

4kΩ pull up resistor to internal reference voltage. The U3848/A/B/C

also have soft-start function avoiding overshoot, and controlled

driver output rise edge time tR for low EMI.

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

ORDERING INFORMATION

Order Number

Normal

Lead Free Plating

U3848-D08-T

U3848L-D08-T

U3848-S08-R

U3848L-S08-R

U3848-S08-T

U3848L-S08-T

U3848A-D08-T

U3848AL-D08-T

U3848A-S08-R

U3848AL-S08-R

U3848A-S08-T

U3848AL-S08-T

U3848B-D08-T

U3848BL-D08-T

U3848B-S08-R

U3848BL-S08-R

U3848B-S08-T

U3848BL-S08-T

U3848C-D08-T

U3848CL-D08-T

U3848C-S08-R

U3848CL-S08-R

U3848C-S08-T

U3848CL-S08-T

Package

DIP-8

SOP-8

SOP-8

DIP-8

SOP-8

SOP-8

DIP-8

SOP-8

SOP-8

DIP-8

SOP-8

SOP-8

www.unisonic.com.tw

Copyright © 2005 Unisonic Technologies Co., Ltd

DIP-8

SOP -8

*Pb-free plating product number:

U3848L/U3848AL/U3848BL/U3848CL

Packing

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