Switching Voltage Regulator
Switching Voltage Regulator [TO-220-5 FP (Formed Leads)]
FSCQ1565RTYDTU, A Quasi-Resonant Converter (QRC) typically shows lower EMI and higher power conversion efficiency compared to a conventional hard-switched converter with a fixed switching frequency. Therefore, a QRC is well suited for noise-sensitive applications, such as color TV and audio. Each product in the FSCQ seriescontains an integrated Pulse Width Modulation (PWM) controller and a SenseFET. This seriesis specifically designed for quasi-resonant off-line Switch Mode Power Supplies (SMPS) with minimal external components.The PWM controller 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.
Compared with a discrete MOSFET and PWM controller solution, the FSCQ seriescan reduce total cost, component count, size, and weight;while increasing efficiency, productivity, and system reliability. These devices provide a basic platform for cost-effective designs of quasi-resonant switching flyback converters.Related ResourcesAN-4146 —Design Guidelines for Quasi-Resonant Converters Using FSCQ-Series Fairchild Power SwitchAN-4140 —Transformer Design Consideration for Offline Flyback Converters Using Fairchild PowerSwitchOrdering Information Part NumberPackageMarking CodeBVDSS(V)RDSONMax. (Ω)FSCQ0565RTYDTUTO-220F-5L (Forming)CQ0565RT6502.2FSCQ0765RTYDTUTO-220F-5L (Forming)CQ0765RT6501.6FSCQ0965RTYDTUTO-220F-5L (Forming)CQ0965RT6501.2FSCQ1265RTYDTUTO-220F-5L (Forming)CQ1265RT6500.9FSCQ1565RTYDTUTO-220F-5L (Forming)CQ1565RT6500.7
- Optimized for Quasi-Resonant Converter (QRC)
- Advanced Burst-Mode Operation for under 1W Standby Power Consumption
- Pulse-by-Pulse Current Limit
- Overload Protection (OLP) –Auto Restart
- Over-Voltage Protection (OVP) –Auto Restart
- Abnormal Over-Current Protection (AOCP) –Latch
- Internal Thermal Shutdown (TSD) –Latch
- Under-Voltage Lockout (UVLO) with Hysteresis
- Low Startup Current (Typical: 25μA)
- Internal High Voltage SenseFET
- Built-in Soft-Start (20ms)
- Extended Quasi-Resonant Switching
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