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Home > PWM Controller
UCSR3652S Datasheet

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
The UTC UCSR3652S 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,
* 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
* VDD under-voltage lockout
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