FSL206MR: 650V Integrated Power Switch with Line UVP and no bias winding for 7Watt offline flyback converters

The FSL206MR integrates a Pulse Width Modulator (PWM) and SenseFET is specifically designed for high-performance offline Switch Mode Power Supplies (SMPS) while minimizing external components. This device integrates high-voltage power regulators that combine an avalanche-rugged SenseFET with a current mode PWM control block.

The integrated PWM controller includes: a 7.8V regulator, eliminating the need for an auxilliary bias winding; Under-Voltage Lockout (UVLO) Protection; Leading-Edge Blanking (LEB); an optimized gate turn-on/turn-off driver; EMI attenuator; Thermal Shutdown (TSD) protection; temperature- compensated precision current sources for loop compensation; soft-start during startup; and fault-protection circuitry such as Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over- Current Protection (AOCP) and Line Under-Voltage Protection (LUVP).

The internal high-voltage startup switch and the Burst-Mode operation with very low operating current reduce the power loss in Standby Mode. As a result, it is possible to reach a power loss of 150mW with no bias winding and 25mW (for FSL206MR) or 30mW (for FSL206MRBN) with a bias winding under no-load conditions when the input voltage is 265VAC.

Features

• Internal Avalanche Rugged SenseFET: 650V
  
• Precision Fixed Operating Frequency: 67kHz
  
• No-Load <150mW at 265V_AC without Bias Winding;
  • <25mW with Bias Winding for FSL206MR
  • <30mW with Bias Winding for FSL206MRBN
• <25mW with Bias Winding for FSL206MR
  
• <30mW with Bias Winding for FSL206MRBN
  
• No Need for Auxiliary Bias Winding
  
• Frequency Modulation for Attenuating EMI
  
• Line Under-Voltage Protection (LUVP)
  
• Pulse-by-Pulse Current Limiting
  
• Low Under-Voltage Lockout (UVLO)
  
• Ultra-Low Operating Current: 300µA
  
• Built-In Soft-Start and Startup Circuit
  
• Various Protections: Overload Protection (OLP),Over-Voltage Protection (OVP), Thermal Shutdown(TSD), Abnormal Over-Current Protection (AOCP),Auto-Restart Mode for All Protections
  

Application Notes