US1651

DESCRIPTION

The UTC US1651 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 US1651 operates in primary-side sensing and

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

operates in fixed frequency mode at large load conditions,

frequency reduction mode at light/medium load and ‘Extended

burst mode’ at No/light load conditions. So that low standby power

can be achieved.

The UTC US1651 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

* Programmable CV and CC regulation

* Primary-side sensing and regulation with No TL431 and

opto-coupler

* Multi-mode operation for high efficiency

* Adjustable constant current and output power setting

* Power on soft-start time (4ms)

* Frequency shuffling and adjustable gate drive greatly

  improving EMI

* ”Extended burst mode control” for improved efficiency

   and minimum standby design

* Built-in leading edge blanking (LEB)

* V DD under voltage lockout

* V DD over voltage shutdown and clamp

* Cycle-by-Cycle current limiting

* Fail-safe protection for open loop fault condition

* Auto-restart in over voltage condition

规格书US1651