HIGH PRECISION CC/CV PRIMARY-SIDE PWM CONTROLLER WITH FAST DYNAMIC RESPONSE

DESCRIPTION

The UTC UPSR108 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 UPSR108 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 UPSR108 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.

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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 100mW Standby Power

* Programmable Cable drop Compensation

* Pin Floating Protection

* Fast Dynamic Response

* 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