Description The FSD146MRBN is an integrated Pulse Width Modulation (PWM) controller and SenseFET designed for offline Switch-Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature compensated precise current sources for loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the FSD146MRBN can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for cost-effective design of a flyback converter. Features ■ Advanced Soft Burst-Mode Operation for Low Standby Power and Low Audible Noise ■ Random Frequency Fluctuation for Low EMI ■ Pulse-by-Pulse Current Limit ■ Various Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis, Output-Short Protection (OSP), and Under-Voltage Lockout (UVLO) with Hysteresis ■ Low Operating Current (0.4mA) in Burst Mode ■ Internal Startup Circuit ■ Internal High-Voltage SenseFET: 650V ■ Built-in Soft-Start: 15ms ■ Auto-Restart Mode Applications ■ Power Supply for LCD Monitor, STB, and DVD Combination
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