Description

The FSL336LR integrated Pulse Width Modulator (PWM) and

SENSEFET® is specifically designed for high−performance offline

buck, buck−boost, and non−isolation flyback Switched Mode Power

Supplies (SMPS) with minimal external components. This device

integrates a high−voltage power regulator that enables operation

without auxiliary bias winding. An internal transconductance amplifier

reduces external components for the feedback compensation circuit.

The integrated PWM controller includes: 10 V regulator for no

external bias circuit, Under−Voltage Lockout (UVLO), Leading−Edge

Blanking (LEB), an optimized gate turn−on / turn−off driver, EMI

attenuator, Thermal Shutdown (TSD), temperature−compensated

precision current sources for loop compensation, and fault−protection

circuitry. Protections include: Overload Protection (OLP),

Over−Voltage Protection (OVP), and Feedback Open Loop Protection

(FB_OLP). FSL336LR offers good soft−start performance during

startup.

The internal high−voltage startup switch and the Burst−Mode

operation with very low operating current reduce the power loss in

Standby Mode. As the result, it is possible to reach power loss of

120 mW without external bias and 25 mW with external bias when

input voltage is 230 VAC.

Features

• Built−in Avalanche−Rugged SENSEFET: 650 V

• Fixed Operating Frequency: 50 kHz

• No−Load Power Consumption:

<25 mW at 230 VAC with External Bias;

<120 mW at 230 VAC without External Bias

• No Need for Auxiliary Bias Winding

• Frequency Modulation for Attenuating EMI

• Pulse−by−Pulse Current Limiting

• Ultra−Low Operating Current: 250 A

• Built−in Soft−Start and Startup Circuit

• Adjustable Peak Current Limit

• Built−in Transconductance (Error) Amplifier

• Various Protections: Overload Protection (OLP), Over−Voltage

Protection (OVP), Feedback Open−Loop Protection (FB_OLP),

Thermal Shutdown (TSD)

• Fixed 650 ms Restart Time for Safe Auto−Restart of All Protections

• These Devices are Pb−Free, Halide Free and are RoHS Compliant

Applications

• SMPS for Home Appliances and Industrial Applications

• SMPS for Auxiliary Power