TOP249YN Integrated Off-Line Switcher IC TO-220-7C

Description

TOP249YN Integrated Off-Line Switcher IC TO-220-7C TOP249Y/N is a member of the TOPSwitch-GX family, an integrated off-line switcher built around a high-voltage power MOSFET and low-voltage control circuitry on a single CMOS chip. In the Y package, it comes as a TO-220-7C device, which gives it a practical through-hole form for compact power-supply designs. The part is aimed at simplifying AC-DC conversion by combining switching and control functions in one device. In the datasheet, TOP249 is shown as a higher-power member of the family, appearing in examples such as a 70 W line-sensing supply and a 250 W, 48 V design. That placement suggests a device intended for demanding offline converters where stable regulation, manageable dissipation, and straightforward implementation matter. Its family positioning makes it suitable for designs that need a compact controller with enough headroom for stronger output stages. The TOP249Y/N ordering option also reflects the family’s flexibility in package and lead-finish choices. The Y package keeps the device in the TO-220-7C format, while the N suffix identifies the pure matte tin lead finish. Together, these details make the part a familiar choice for power-supply designs that need a robust package, straightforward assembly, and a well-established integrated off-line control platform. Features: Integrated high-voltage MOSFET, PWM control, fault protection, and other control circuitry on one chip. Fully integrated soft-start for reduced start-up stress and overshoot. Extra package pins enable line sensing, externally set current limit, remote ON/OFF, synchronization, and frequency selection. Frequency reduction at light load for better standby efficiency. Frequency jittering to reduce EMI. Hysteretic thermal shutdown for automatic fault recovery. Tight tolerances on current limit, frequency, and PWM gain to simplify design. Specifications: Specification TOP249YN Value Package: TO-220-7C (Y package) Lead finish option: N = Pure Matte Tin (Pb-Free) Drain voltage: -0.3 V to 700 V Drain peak current: 8.64 A Switching frequency (default): 132 kHz Half-frequency option: 66 kHz Self-protection current limit (Y/R/F): 5.022 A min / 5.40 A typ / 5.778 A max Thermal shutdown temperature: 130 °C min / 140 °C typ / 150 °C max Thermal shutdown hysteresis: 75 °C Thermal resistance, Y package: θJA 80 °C/W; θJC 2 °C/W Output power: 44 W / 120 W at 230 VAC ±15%; 79 W / 250 W at 85–265 VAC Pinout: Applications: A High Efficiency, 30 W, Universal Input Power Supply. A High Efficiency, Enclosed, 70 W, Universal Adapter Supply. A High Efficiency, 250 W, 250-380 VDC Input Power Supply. Multiple Output, 60 W, 185-265 VAC Input Power Supply. Processor Controlled Supply Turn On/Off. Package Contents: 1x TOP249YN Integrated Off-Line Switcher IC TO-220-7C Datasheet

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