fscq1265r

Product Summary

The Quasi-Resonant Converter (QRC) fscq1265r shows lower EMI and higher power conversion efficiency compared to conventional hard-switched converter with a fixed switching frequency. Therefore, the QRC fscq1265r is well suited for noisesensitive applications, such as color TV and audio. The device in the FSCQ-Series contains an integrated Pulse Width Modulation (PWM) controller and a SenseFET, and is specifically designed for quasi-resonant off-line Switch Mode Power Supplies (SMPS) with minimal external components. The PWM controller of the fscq1265r 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 a loop compensation, and self protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the fscq1265r can reduce total cost, component count, size, and weight, while simultaneously increasing efficiency, productivity, and system reliability. The fscq1265r provides a basic platform that is well suited for cost-effective designs of quasi-resonant switching flyback converters.

Parametrics

fscq1265r absolute maximum ratings: (1)Drain Pin Voltage, VDS: 650 V; (2)Supply Voltage, VCC: 20 V; (3)Analog Input Voltage Range: Vsync: -0.3 to 13V V; VFB: -0.3 to VCC V; (4)Drain Current Pulsed, IDM: 21.2A; (5)Continuous Drain Current(Tc=25℃) (Tc : Case Back Surface Temperature), ID: 5.3A; (6)Continuous Drain Current * (TDL=25℃) (TDL :Drain Lead Temperature), ID: 11A; (7)Continuous Drain Current (TC=100℃), ID: 3.4A; (8)Single-Pulsed Avalanche Energy, EAS: 950mj; (9)Total Power Dissipation (Tc=25℃ with Infinite Heat Sink), PD: 50w; (10)Operating Junction Temperature, TJ: +150 ℃; (11)Operating Ambient Temperature, TA: -25 to +85 ℃; (12)Storage Temperature Range, TSTG: -55 to +150 ℃; (13)ESD Capability, HBM Model (All pins except Vfb): - 2.0(GND-Vfb=1.7kV)kV; (14)ESD Capability, Machine Model (All pins except Vfb): 300(GND-Vfb=170V) V.

Features

fscq1265r features: (1)Optimized for Quasi-Resonant Converter (QRC); (2)Advanced Burst-Mode Operation for under 1W Standby Power Consumption; (3)Pulse-by-Pulse Current Limit; (4)Over Load Protection (OLP) - Auto Restart; (5)Over Voltage Protection (OVP) - Auto Restart; (6)Abnormal Over Current Protection (AOCP) - Latch; (7)Internal Thermal Shutdown (TSD) - Latch; (8)Under Voltage Lock Out (UVLO) with Hysteresis; (9)Low Startup Current (typical : 25uA); (10)Internal High Voltage SenseFET; (11)Built-in Soft Start (20ms); (12)Extended Quasi-Resonant Switching.

Diagrams