UNISONIC TECHNOLOGIES CO., LTD

UCSR3652S

CMOS IC

www.unisonic.com.tw

1 of 10

Copyright © 2016 Unisonic Technologies Co., Ltd

QW-R129-017.C

SOP-8

DIP-7A

HIGH PRECISION CC/CV

PRIMARY-SIDE PWM POWER

SWITCH



DESCRIPTION

The UTC UCSR3652S is a primary control switch mode

charger and adapter applications. The controlled variable is

transferred by an auxiliary winding from the secondary to the

primary side. The device integrates PWM controller to enhance

the performance of discontinuous conduction mode (DCM)

flyback converters.

The UTC UCSR3652S operates in primary-side sensing and

regulation. Opto-coupler and TL431 could be eliminated. It also

provides off-time modulation to linearly decrease PWM frequency

under light-load conditions so that low standby power can be

achieved.

The UTC UCSR3652S achieves high precision CV/CC

regulation and high power efficiency. It offers comprehensive

protection coverage with auto-recovery features including

etc.



FEATURES

* High voltage startup circuit

* Built-in 650V Power MOSFET

* ±5% constant voltage regulation at universal AC input

* High precision constant current regulation at universal AC input

* Primary side control without TL431 and opto-coupler

* Programmable CV and CC regulation

* Programmable cable compensation in CV mode

* Flyback topology in DCM operation

* Frequency hopping to reduce system EMI

* Built-in leading edge blanking

* Built-in primary winding inductance

compensation

* Power on soft start

* Gate Output Maximum Voltage Clamped at 15V

* Cycle-by-cycle current limiting

* Over voltage protection



ORDERING INFORMATION

Ordering Number

Lead Free

Halogen Free

Package

Packing

UCSR3652SL-D07A-T

UCSR3652SG-D07A-T

DIP-7A

Tube

-

UCSR3652SG-S08-R

SOP-8

Tape Reel

UCSR3652SL-D07A-T

(1)Packing Type

(2)Package Type

(1) T: Tube, R: Tape Reel

(2) D07A: DIP-7A, S08: SOP-8

(3) L: Lead Free, G: Halogen Free and Lead Free

(3)Green Package