UCSR3654 SWITCH Datasheet

UCSR3654 Datasheet, PDF, Equivalent


Part Number

UCSR3654

Description

HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

Manufacture

UTC

Total Page 9 Pages
Datasheet
Download UCSR3654 Datasheet


UCSR3654
UNISONIC TECHNOLOGIES CO., LTD
UCSR3654
Preliminary
HIGH PRECISION CC/CV
PRIMARY-SIDE PWM POWER
SWITCH
CMOS IC
DESCRIPTION
The UTC UCSR3654 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 UCSR3654 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 UCSR3654 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, VDD over voltage protection, VDD clamp, OTP,
leading edge blanking, VDD under voltage lockout, etc.
DIP-8
SOP-8
FEATURES
* 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
* VDD under-voltage lockout
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UCSR3654L-D08-T
UCSR3654G-D08-T
UCSR3654L-S08-R
UCSR3654G-S08-R
Package
DIP-8
SOP-8
Packing
Tube
Tape Reel
www.unisonic.com.tw
Copyright © 2019 Unisonic Technologies Co., Ltd
1 of 9
QW-R129-006.c

UCSR3654
UCSR3654
MARKING
Preliminary
PIN CONFIGURATION
CMOS IC
PIN DESCRIPTION
PIN NO.
1
2
3
4
5, 6
7, 8
PIN NAME
VDD
COMP
INV
CS
DRAIN
GND
DESCRIPTION
Power Supply
Loop Compensation
The voltage feedback from the auxiliary winding
Current sense input
Power MOSFET Drain Pin
Ground
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 9
QW-R129-006.c


Features UNISONIC TECHNOLOGIES CO., LTD UCSR3654 Preliminary HIGH PRECISION CC/CV PRI MARY-SIDE PWM POWER SWITCH CMOS IC DESCRIPTION The UTC UCSR3654 is a pri mary control switch mode charger and ad apter applications. The controlled vari able is transferred by an auxiliary win ding from the secondary to the primary side. The device integrates PWM control ler to enhance the performance of disco ntinuous conduction mode (DCM) flyback converters. The UTC UCSR3654 operates i n primary-side sensing and regulation. Opto-coupler and TL431 could be elimina ted. It also provides off-time modulati on to linearly decrease PWM frequency u nder light-load conditions so that low standby power can be achieved. The UTC UCSR3654 achieves high precision CV/CC regulation and high power efficiency. I t offers comprehensive protection cover age with auto-recovery features includi ng Cycle-by-cycle current limiting, VDD over voltage protection, VDD clamp, OT P, leading edge blanking, VDD under voltage lockout, etc. DIP-8 .
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