US3651

DESCRIPTION

The UTC US3651 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 US3651 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 US3651 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.

FEATURES

* 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

规格书US3651