FSQ321: 650V Integrated Power Switch with Valley Switching control for 10Watt offline flyback converters

Description: A Valley Switching Converter generally shows lower...
  • A Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for valley switching operation 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 discrete MOSFET and PWM controller solutions, the FSQ-series reduces total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for cost-effective designs of valley switching fly-back converters.
  • Features
  • Optimized for Valley Switching (VSC)
  • Low EMI through Variable Frequency Control andInherent Frequency Modulation
  • High Efficiency through Minimum Voltage Switching
  • Narrow frequency Variation Range over Wide Load andInput Voltage Variation
  • Advanced Burst-Mode Operation for Low StandbyPower Consumption
  • Pulse-by-Pulse Current Limit
  • Various Protection functions: Over Load Protection(OLP), Over Voltage Protection (OVP), AbnormalOver Current Protection (AOCP), Internal ThermalShutdown (TSD)
  • Under Voltage Lock Out (UVLO) with Hysteresis
  • Internal Start-up Circuit
  • Internal High-Voltage Sense FET (650V)
  • Built-in Soft-Start (15ms)
  • Applications
  • DVD/Set Top Boxes
  • Technical Documentation & Design Resources
    Availability and Samples
    FSQ321
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: 650V Integrated Power Switch with Valley Switching control for 10Watt offline flyback converters
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 3000
  • Inventory

  • Market Leadtime (weeks):13 to 16
  • Arrow:0
  • ON Semiconductor:6,000
  • FSQ321L
  • Status: Lifetime
  • Compliance: Pb-free Halide free 
  • Description: 650V Integrated Power Switch with Valley Switching control for 10Watt offline flyback converters
  • Package Type: PDIP-8 GW
  • Package Case Outline: 
  • MSL: 3
  • Container Type: TUBE
  • Container Qty: 3000
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • ON Semiconductor:6,000
  • FSQ321LX
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: 650V Integrated Power Switch with Valley Switching control for 10Watt offline flyback converters
  • Package Type: PDIP-8 GW
  • Package Case Outline: 
  • MSL: 3
  • Container Type: REEL
  • Container Qty: 1000
  • Specifications
  • Control Mode: Current Mode 
  • fsw Typ (kHz): Variable 
  • fJitter Typ (%):  
  • Stand-by Mode:  
  • RDS(ON) Typ (Ω): 14 
  • V(BR)DSS Max (V): 650 
  • IPeak (mA): 600 
  • HV Start-up Min (V): Yes 
  • DSS (mA):  
  • UVLO: Yes 
  • Short Circuit Protection: Yes 
  • Over Power Compensation:  
  • Brown-out:  
  • Latch: No 
  • Package Type: PDIP-8  PDIP-8 GW 
  • ON Semiconductor Full Web Site