PRIMARY-SIDE REGULATION PWM POWER SWITCH
DESCRIPTION
The UTC US1652 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 US1652 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 US1652 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.
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)
* VDD under voltage lockout
* VDD over voltage shutdown and clamp
* Cycle-by-Cycle current limiting
* Fail-safe protection for open loop fault condition
* Auto-restart in over voltage condition |
