Product Summary

The Q0265R is a Valley Switching Converter, which generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The Q0265R is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation with minimal external components. The Q0265R includes an integrated fixed-frequency oscillator, Under-Voltage Lockout, Leading Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. The applications of the Q0265R include Power Supply for DVP Player and DVD Recorder, Set-Top Box, Adapter, Auxiliary Power Supply for PC, LCD TV, and PDP TV.

Parametrics

Q0265R absolute maximum ratings: (1)Vstr Pin Voltage: 500 V; (2)Drain Pin Voltage: 650 V; (3)Supply Voltage: 20 V; (4)Feedback Voltage Range: -0.3 to 9.0 V; (5)Sync Pin Voltage Range: -0.3 to 9.0 V; (6)Drain Current Pulsed: 8 A; (7)Single Pulsed Avalanche Energy: 140 mJ; (8)Total Power Dissipation: 1.5 W; (9)Recommended Operating Junction Temperature: -40 to Internally limited ℃; (10)TA Operating Ambient Temperature: -40 to 85 ℃; (11)TSTG Storage Temperature: -55 to 150 ℃; (12)Human Body Model: CLASS1 C; (13)Machine Model: CLASS B.

Features

Q0265R features: (1)Optimized for Valley Switching (VSC); (2)Low EMI through Variable Frequency Control and Inherent Frequency Modulation; (3)High-Efficiency through Minimum Voltage Switching; (4)Narrow Frequency Variation Range over Wide Load and Input Voltage Variation; (5)Advanced Burst-Mode Operation for Low Standby Power Consumption; (6)Pulse-by-Pulse Current Limit; (7)Various Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD); (8)Under-Voltage Lockout (UVLO) with Hysteresis; (9)Internal Start-up Circuit; (10)Internal High-Voltage SenseFET (650V); (11)Built-in Soft-Start (15ms).

Diagrams