Green Mode Fairchild Power Switch Field Effect Transistor , FSDM0465R

Features „

• Internal Avalanche Rugged SenseFET „
• Low Start-up Current (max. 40µA) „
• Low Power Consumption; under 1W at 240VAC and 0.4W Load „
• Precise Fixed Operating
• Frequency (66kHz) „ Frequency Modulation for Low EMI „
• Pulse-by-Pulse Current Limiting (Adjustable) „
• Over-Voltage Protection (OVP) „
• Overload Protection (OLP) „
• Thermal Shutdown Function (TSD) „
• Auto-Restart Mode „
• Under-Voltage Lock Out (UVLO) with Hysteresis „
• Built-in Soft-Start (15ms)

Applications „

• SMPS for VCR, SVR, STB, DVD, and DVCD „
• Adaptor „
• SMPS for LCD Monitor

Related Application Notes „

• AN-4137: Design Guidelines for Off-line Flyback Converters Using Fairchild Power Switch (FPS) „
• AN-4140: Transformer Design Consideration for Off-line Flyback Converters using Fairchild Power Switch
• „AN-4141: Troubleshooting and Design Tips for Fairchild Power Switch Flyback Applications „
• AN-4148: Audible Noise Reduction Techniques for FPS Applications

Description
The FSCM0465R is an integrated Pulse-Width Modulator (PWM) and SenseFET specifically designed for high-performance offline Switch Mode Power Supplies (SMPS) with minimal external components. This device is an integrated high-voltage powerswitching regulator that combines an avalanche rugged SenseFET with a current mode PWM control block. The PWM controller includes an integrated fixed-frequency oscillator, under-voltage lockout, leading edge blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for a loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, it can reduce total cost, component count, size, and weight while simultaneously increasing efficiency, productivity, and system reliability. This device is a basic platform well suited for cost-effective designs of flyback converters.

Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings.

TA = 25°C unless otherwise specified.

Notes: 1. T_j = 25°C to 150°C
2. Repetitive rating: Pulse-width limited by maximum junction temperature
3. T _C: Case back surface temperature with infinite heat sink


Typical Circuit
Figure 1. Typical Flyback Application


Internal Block Diagram
Figure 2. Functional Block Diagram of FSCM0465R


Pin Configuration
Figure 3. Pin Configuration (Top View)

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