The R7779 is a high-performance current mode PWM controller with integrated HV start-up device inside. During start-up, a current source through integrated HV device to charge VDD capacitor for quick start-up while it dissipates no loss in normal operation.
The R7779 provides the users a superior AC/DC power application of higher efficiency, low external component counts, and low cost solution. It features frequency jitter, Under Voltage LockOut (UVLO), Leading Edge Blanking (LEB), internal slope compensation in the tiny SOP-8 package. It offers complete protection coverage with Over Temperature Protection (OTP), Over Load Protection (OLP) and Over Voltage Protection (OVP).
Moreover, it also provides a special interface for zero power application when the converter is in sleeping mode. EN/DIS pin receives ON/OFF signal from secondary scalar controller. During turning off, the controller will be shutdown completely with pretty low power consumption.
- Switching AC/DC Adaptor and Battery Charger
- TV and Monitor Application