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
