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Home > PWM Controller
UPSR104 Datasheet






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


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.




* ±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 Clamp

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