UPSR104

UNISONIC TECHNOLOGIES CO., LTD UPSR104 Preliminary 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. CMOS IC 65 4 1 23 SOT-26  FEATURES * ±5% Constant Voltage Regulation at Universal AC input * Built-in Primary winding inductance * High Precision Constant Current Regulation at Universal AC input compensation * Primary-side Sensing and Regulation Without TL431 and * Programmable Cable drop Compensation Opto-coupler * Power on Soft-start * Programmable CV and CC Regulation * Built-in Leading Edge Blanking (LEB) * Adjustable Constant Current and Output Power Setting * Cycle-by-Cycle Current Limiting * Built-...