HIGH PRECISION CC/CV PRIMARY-SIDE PWM CONTROLLER
DESCRIPTION
The UTC UPSR104 is a primary controller 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 UPSR104 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 UPSR104 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
* ±5% Constant Voltage Regulation at Universal AC input
* High Precision Constant Current Regulation at Universal AC input
* Primary-side Sensing and Regulation Without TL431 and Opto-coupler
* Programmable CV and CC Regulation
* Adjustable Constant Current and Output Power Setting
* Built-in Secondary Constant Current Control with Primary Side Feedback
* Built-in Adaptive Current Peak Regulation
* Built-in Primary winding inductance compensation
* Programmable Cable drop Compensation
* Power on Soft-start
* Built-in Leading Edge Blanking (LEB)
* Cycle-by-Cycle Current Limiting
* VDD Under Voltage Lockout with Hysteresis (UVLO)
* VDD OVP
* VDD Clamp |