FS7M0880

www.fairchildsemi.com FS7M0680, FS7M0880 Features • • • • • • • • Pulse by Pulse Current Limit Over load protection (OLP) - Latch Over voltage protection (OVP) - Latch Internal Thermal Shutdown (TSD) - Latch Under Voltage Lock Out (UVLO) with hysteresis Internal High Voltage SenseFET (800V rated) User defined Soft Start Precision Fixed Operating Frequency (66kHz) Fairchild Power Switch (FPSTM) Table 1. Maximum Output Power OUTPUT POWER TABLE PRODUCT 230VAC ±15%(2) Open Frame(1) 80W (Flyback) 150W (Forward) 180W (Forward) (3) 110W (Flyback) 200W (Forward) 250W (Forward) (3) 85-265VAC Open Frame(1) 65W (Flyback) FS7M0680 FS7M0880 85W (Flyback) Application • PC power supply • PDP Notes: 1. Maximum practical continuous power in an open frame design at 50°C ambient. 2. 230 VAC or 100/115 VAC with doubler. 3. When the cooling fan is used. Description The Fairchild Power Switch FS7M-series is an integrated Pulse Width Modulator (PWM) and Sense FET specifically designed for high performance offline Switch Mode Power Supplies (SMPS) with minimal external components. This device is an integrated high voltage power switching regulator which combine an avalanche rugged Sense FET with a current mode PWM control block. The PWM controller includes integrated fixed frequency oscillator, under voltage lockout, leading edge blanking (LEB), optimized gate driver, soft start, temperature compensated precise current sources for a loop compensation and self protection circuitry. Compared with discrete MOSFET and PWM controller solution, it can reduce total cost, component count, size and weight simultaneously increasing efficiency, productivity, and system reliability. This device is a basic platform well suited for cost effective designs of flyback and forward converters. Typical Circuit Vo AC IN S/S FS7M-series PWM Drain GND VFB Vcc Figure 1. Typical Forward Application Rev.1.0.2 ©2005 Fairchild Semiconductor Corporation FS7M0680, FS7M0880 Internal Block Diagram Vcc 3 Vref Drain 1 Vcc good Vref 9V/15V Soft start 5 Reset OSC Internal Bias Vcc Idelay Vref IFB PWM 2.5R R S R Q Q FB 4 Gate driver LEB VSD Vcc S Q Vovp TSD Vcc Reset (Vcc