HIGH PRECISION CC/CV PRIMARY-SIDE PWM CONTROLLER
DESCRIPTION
The UTC UPSR107 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
Quasi Resonant (QR) mode flyback converters.
The UTC UPSR107 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 UPSR107 integrates functions and protections of
Under Voltage Lockout (UVLO), VDD Over Voltage Protection (VDD
OVP), Output Over Voltage Protection (Output OVP), OTP, Soft
Start, Cycle-by-cycle Current Limiting (OCP), Pin Floating
Protection, Gate Clamping, VDD Clamping.
FEATURES
* ±5% CC and CV Precision
* Easily Meet EPS Level 6
* QR Mode Control for High Efficiency and Low EMI
* Programmable CV and CC Regulation
* Less than 70mW Standby Power
* Programmable Cable drop Compensation
* Pin Floating Protection
* Built-in Soft Start
* Output Over Voltage Protection
* Cycle-by-Cycle Current Limiting
* Built-in Leading Edge Blanking (LEB)
* VDD Under Voltage Lockout with Hysteresis (UVLO)
* VDD OVP
* VDD Clamp |