R7731A

R7731A Burst Triple Mode PWM Flyback Controller General Description The R7731A is a high-performance, low cost, low start-up current and current mode PWM controller with burst triple mode to support green mode power saving operation. The R7731A integrates functions of soft start, Under Voltage LockOut (UVLO), Leading Edge Blanking (LEB), Over Temperature Protection (OTP) and internal slope compensation. It provides the users a superior AC/DC power application of higher efficiency, low external component counts and lower cost solution. To protect the external power MOSFET from being damaged by supply over voltage, the R7731A output driver is clamped at 12V. Furthermore, R7731A features fruitful protections like Over Load Protection (OLP) and Over Voltage Protection (OVP) to eliminate the external protection circuits and provide reliable operation. R7731A is available in SOT-23-6 and DIP-8 packages. Ordering Information R7731A Package Type E : SOT-23-6 N : DIP-8 Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. Features z Very Low Start-up Current (<30μA) z 10/14V UVLO z Soft Start Function z Current Mode Control z Jittering Switching Frequency z Internal Leading Edge Blanking z Built-in Slope Compensation z Burst Triple Mode PWM for Green-Mode z Cycle-by-Cycle Current Limit z Feedback Open ...