RT7730

Preliminary RT7730 Burst Triple-mode PWM Flyback Controller General Description The RT7730 is a high-performance, low cost, low startup current, current mode PWM controller with burst triplemode to support green mode power saving operation. The RT7730 integrates functions of Soft Start, Under VoItage Lockout (UVLO), Leading Edge Blanking (LEB), Over Temperature Protuction (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 RT7730 output driver is clamped at 13.5V. Furthermore, RT7730 features fruitful protections like OLP (Over Load Protection) ,OVP (Over Voltage Protection) to eliminate the external protection circuits and provide reliable operation. RT7730 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 Internal Leading-Edge Blanking z Built-in Slope Compensation z Burst Triple-Mode PWM for Green-Mode z Cycle-by-Cycle Current Limiting z Secondary Rectifier Short Protection z Feedback Open Protection z Output Over Voltage Protection z Over Temperature Protection z Over Load Protection z Soft Driving fo...