FSDH321

Product Summary

The FSDH321(x stands for H, L) is a integrated Pulse Width Modulator (PWM) and Sense FET specifically designed for high performance offline Switch Mode Power Supplies(SMPS) with minimal external components. FSDH321 is integrated high voltage power switching regulator which combines an avalanche rugged Sense FET with a current mode PWM control block. The integrated PWM controller features include: a fixed oscillator with frequency modulation for reduced EMI, Under Voltage Lock Out (UVLO)protection, Leading Edge Blanking (LEB), optimized gate turn-on/turn-off driver, Thermal Shut Down (TSD) protection, Abnormal Over Current Protection (AOCP) and temperature compensated precision current sources for loop compensation and fault protection circuitry. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSDH321 reduces total component count, design size, weight and at the same time increase efficiency, productivity, and system reliability.

Parametrics

FSDH321 absolute maximum ratings: (1)Maximum Vstr Pin Voltage, VSTR,MAX: 650 V; (2)Maximum Drain Pin Voltage, VDRAIN,MAX: 650 V; (3)Drain-Gate Voltage (RGS=1MΩ ), VDGR: 650 V; (4)Gate-Source (GND) Voltage, VGS: ±20 V; (5)Drain Current Pulsed, IDM: 1.5 ADC; (6)Continuous Drain Current (Tc=25℃ ), ID: 0.7 ADC; (7)Continuous Drain Current (Tc=100℃ ), ID: 0.32 ADC; (8)Single Pulsed Avalanche Energy, EAS, 10 mJ; (9)Maximum Supply Voltage, VCC,MAX, 20 V; (10)Input Voltage Range, VFB: -0.3 to Vstop V; (11)Total Power Dissipation, PD: 1.25 W; (12)Operating Junction Temperature, TJ: +150 ℃ ; (13)Operating Ambient Temperature, TA: -25 to +85 ℃ ; (14)Storage Temperature Range, TSTG: -55 to +150 ℃ .

Features

FSDH321 features: (1)Internal Avalanche Rugged Sense FET; (2)Consumes only 0.65W at 240VAC & 0.3W load with Advanced Burst-Mode Operation; (3)Frequency Modulation for low EMI; (4)Precision Fixed Operating Frequency; (5)Internal Start-up Circuit; (6)Pulse by Pulse Current Limiting; (7)Abnormal Over Current Protection; (8)Over Voltage Protection ; (9)Over Load Protection; (10)Internal Thermal Shutdown Function; (11)Auto-Restart Mode; (12)Under Voltage Lockout; (13)Low Operating Current (max 3mA); (14)Adjustable Peak Current Limit; (15)Built-in Soft Start.

Diagrams