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This literature is subject to all applicable copyright laws and is not for resale in any manner.FSL3276ALR Non-Isolated High-Voltage Buck Switch March 2016 FSL3276ALR Non-Isolated High-Voltage Buck Switch for Low Power Application in Building Automation / IoT Description Features The FSL3276ALR is configured as a non-isolated high- Built-in Avalanche Rugged SenseFET: 650 V voltage buck switch and is ideal for low-power Fixed Operating Frequency: 50 kHz applications. Its peak current is adjustable down to 70 mA which enables optimum inductor size selection. No-Load Power Consumption: < 25 mW at 230 V AC The modulation control is designed to reduce standby with External Bias <120 mW at 230 V without AC power to 25 mW at 230 V input. Though the Pulse AC External Bias Width Modulator (PWM) and SenseFET are ideally integrated for a high-performance offline buck, it can No Need for Auxiliary Bias Winding also be configured as a buck-boost or non-isolated Frequency Modulation for Attenuating EMI flyback with minimal external components. The device Pulse-by-Pulse Current Limiting integrates a high-voltage power regulator that enables operation without an auxiliary bias winding. An internal Ultra-Low Operating Current: 250 A transconductance amplifier reduces external components for the feedback compensation circuit. The Built-in Soft-Start and Startup Circuit integrated PWM controller includes: 10 V regulator for Adjustable Peak Current Limit no external bias circuit, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), an optimized gate turn- Built-in Transconductance (Error) Amplifier on / turn-off driver, EMI attenuator, Thermal Shutdown Various Protections: Overload Protection (OLP), (TSD), temperature-compensated precision current Over-Voltage Protection (OVP), Open Feedback sources for loop compensation, and fault-protection Loop Protection (OFLP), AOCP (Abnormal Over- circuitry. Protections include: Overload Protection Current Protection), Thermal Shutdown (TSD) (OLP), Over-Voltage Protection (OVP), Open Feedback Loop Protection (OFLP), and Abnormal Over-Current Fixed 650 ms Restart Time for Safe Auto-Restart Protection (AOCP). FSL3276ALR offers good soft-start Mode of All Protections performance during startup. The internal high-voltage Applications startup switch and the Burst-Mode operation with very low operating current reduce the power loss in Standby Building Automation/ IoT Mode. As the result, it is possible to reach power loss of 120 mW without external bias and 25 mW with external Auxiliary Power Supply for Appliances and bias when input voltage is 230 V . AC Industrial Applications Ordering Information (1) Typical Output Power Operating 85 V ~ 265 V AC AC Part Packing (2) Junction PKG & Open Frame Current Number Method R DS(ON),MAX Temperature Limit Buck Flyback (3) Application Application FSL3276ALRN -40C ~125C 7-DIP Rail 0.30 A 30 1.2 W 2.4 W Notes: 1. The junction temperature can limit the maximum output power. 2. Maximum practical continuous power in an open-frame design at 50C ambient. 3. Based on 15 V output voltage condition. Output voltage can limit the maximum output power. 2015 Fairchild Semiconductor Corporation www.fairchildsemi.com FSL3276ALR Rev.1.2