Your cart is empty.

IC reference design search
IC manufacturers ON Semiconductor

IC manufacturers (84)

ON Semiconductor FSL126HR

650V Integrated Power Switch with 100kHz frequency and adjustable current limit for 17W offline flyback converters


TopologyOther Topology
Switching frequency90-110 kHz
IC revision1.0.0


The FSL126HR integrates a Pulse Width Modulator (PWM) and SenseFET is specifically designed for highperformance offline Switch-Mode Power Supplies (SMPS) with minimal external components. FSL126HR includes integrated high-voltage power switching regulators that combine an avalanche-rugged SenseFET with a current-mode PWM control block. The integrated PWM controller includes: Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), a frequency generator for EMI attenuation, an optimized gate turn-on/turn-off driver, Thermal Shutdown (TSD) protection, and temperaturecompensated precision current sources for loop compensation and fault protection circuitry. The FSL126HR offers good soft-start performance. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSL126MR reduces total component count, design size, and weight; while increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for the design of cost-effective flyback converters.


  • Internal Avalanche-Rugged SenseFET (650V)
  • Under 50mW Standby Power Consumption at265VAC, No-load Condition with Burst Mode
  • Precision Fixed Operating Frequency withFrequency Modulation for Attenuating EMI
  • Internal Startup Circuit
  • Built-in Soft-Start: 20ms
  • Pulse-by-Pulse Current Limiting
  • Various Protections: Over-Voltage Protection(OVP), Overload Protection (OLP), Output-ShortProtection (OSP), Abnormal Over-CurrentProtection (AOCP), Internal Thermal ShutdownFunction with Hysteresis (TSD)
  • Auto-Restart Mode
  • Under-Voltage Lockout (UVLO)
  • Low Operating Current: 1.8mA
  • Adjustable Peak Current Limit

Typical applications

  • Adapter
  • SMPS for Home Appliance


Order Code Data­sheet Downloads Product series Samples
IC Reference Products
Order Code Data­sheet
Order Code Data­sheet Downloads Product series Samples