UCSR3651S Datasheet, PDF (1/9 Pages) Unisonic Technologies – HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

UNISONIC TECHNOLOGIES CO., LTD
UCSR3651S
HIGH PRECISION CC/CV
PRIMARY-SIDE PWM POWER
SWITCH
CMOS IC
 DESCRIPTION
The UTC UCSR3651S 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 UCSR3651S 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 UCSR3651S achieves high precision CV/CC
regulation and high power efficiency. It offers comprehensive
protection coverage with auto-recovery features including
Cycle-by-cycle current limiting, V_DD over voltage protection, V_DD
clamp, OTP, leading edge blanking, V_DD under voltage lockout, etc.
DIP-7
SOP-8
 FEATURES
* High Voltage startup circuit
* Built-in 600V 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
* V_DD under-voltage lockout
 ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UCSR3651SL-D07-T
UCSR3651SG-D07-T
-
UCSR3651SG-S08-T
Package
DIP-7
SOP-8
Packing
Tube
Tape Reel
UCSR3651SL-D07-T
(1)Packing Type
(2)Package Type
(3)Green Package
(1) T: Tube, R: Tape Reel
(2) D07: DIP-7, S08: SOP-8
(3) L: Lead Free, G: Halogen Free and Lead Free
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
1 of 9
QW-R129-010.A