FSL337LRN

700V 3A Buck Power Switch / RAIL

The FSL337LR 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. FSL337LR 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 V

Features

---

 |

.

Built-in Avalanche-Rugged SenseFET: 700 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 µA

.

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