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R7731

Richtek Technology
Part Number R7731
Manufacturer Richtek Technology
Description Burst Triple-Mode PWM Flyback Controller
Published Jan 2, 2012
Detailed Description R7731 Burst Triple Mode PWM Flyback Controller General Description The R7731 is a high performance, low cost, low star...
Datasheet PDF File R7731 PDF File

R7731
R7731

Overview
R7731 Burst Triple Mode PWM Flyback Controller General Description The R7731 is a high performance, low cost, low start-up current, current mode PWM controller with burst triple mode to support green mode power saving operation.
The R7731 integrates functions of Soft-Start, Under Voltage Lockout (UVLO), Leading Edge Blanking (LEB), Over Temperature Protection (OTP), 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 R7731 output driver is clamped at 12V.
Furthermore, R7731 features fruitful protections like OLP (Over Load Protection) ,OVP (Over Voltage Protection) to eliminate the external protection circuits and provide reliable operation.
R7731 is available in SOT-23-6 and DIP-8 packages.
Applications z Adaptor and Battery Charger z ATX Standby Power z Set Top Boxes (STB) z DVD and CD(R) z TV/Monitor Standby Power z PC Peripherals Typical Application Circuit 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 Limiting z Feedback Open Protection z Output Over Voltage Protection z Over Temperature Protection z Over Load Protection z Soft Driving for Reducing EMI z High Noise Immunity z Opto Coupler Short Protection z RoHS Compliant and Halogen Free AC Mains (90V to 265V) VO+ VO- RT VDD R7731 COMP GATE GND CS DS7731-03 March 2011 www.
richtek.
com 1 R7731 Ordering Information R7731 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.
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