FSL137MRIN Overview
The FSL137MRIN is an integrated Pulse Width Modulation (PWM) controller and SenseFET specifically designed for offline Switched Mode Power Supplies (SMPS) with minimal external ponents. The PWM controller includes an integrated fixed-frequency oscillator, Line Over-Voltage Protection (LOVP), UnderVoltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperaturepensated precise current sources for loop pensation, and self-protection circuitry. VSD 7.0V VCC VOVP 24.5V LPF TSD VIN_H / VIN_L VSTR 5 Random ICH VREF VCC Good OSC PWM SQ RQ LEB (300ns) VCC Drain 2 6, 7, 8 Gate Driver VCC Good SQ RQ VAOCP 1 GND 4 VIN Figure 2. Internal Block Diagram © 2012 Fairchild Semiconductor Corporation FSL137MRIN • Rev. 1.0.1 2 .fairch
FSL137MRIN Key Features
- Advanced Soft Burst Mode for Low Standby Power
- Random Frequency Fluctuation (RFF) for Low EMI
- Under 50 mW Standby Power Consumption at
- Pulse-by-Pulse Current Limit
- Overload Protection (OLP), Over-Voltage
- Low Operating Current (0.4 mA) in Burst Mode
- Internal Startup Circuit
- Internal High-Voltage SenseFET: 700 V
- Built-in Soft-Start: 15 ms
- Auto-Restart Mode