TOP254YN Offline Flyback Switcher IC TO-220-7C
TOP254YN is part of the TOPSwitch-HX family, an enhanced EcoSmart offline switcher that integrates a 700 V power MOSFET, PWM control, oscillator, thermal shutdown, fault protection, and related control circuitry into one monolithic device. In the Y package, it comes in the TO-220-7C form factor, which is identified in the datasheet’s ordering information.
The device is designed for compact isolated power supplies, especially flyback converters, where high integration helps reduce external parts and keeps the design simpler. The datasheet describes the family as using multi-mode operation and control-pin-based regulation to maintain stable operation across changing load conditions while supporting efficient power conversion.
TOP254YN is presented as a robust offline solution for designs that need strong protection behavior, controlled start-up, and reliable recovery from fault conditions. Its package options, line-sensing capability, and tightly integrated control structure make it suitable for engineers who want a practical switcher with compact layout support and dependable primary-side regulation behavior.
Features:
- Integrated 700 V MOSFET and control circuitry on a single monolithic chip.
- Multi-mode operation for improved efficiency across the load range.
- Fully integrated soft-start for reduced start-up stress.
- Hysteretic thermal shutdown with automatic recovery.
- Improved auto-restart behavior for open-loop and short-circuit faults.
- User-programmable output overvoltage protection.
- Dual-slope line feed-forward and line undervoltage/overvoltage detection.
- Frequency jittering to help reduce EMI filter cost.
Specifications:
| Specification | TOP254YN value |
|---|---|
| Package: | TO-220-7C (Y package) |
| Pin finish: | N = RoHS compliant and halogen free |
| DRAIN peak current: | 2.08 A |
| Self protection current limit: | 1.209 A min, 1.30 A 1.391 A max at TJ = 25 °C |
| RDS(ON): | 5.4 Ω min, 6.25 Ω at 25 °C 8.35 Ω min, 9.70 Ω max at 100 °C |
| Breakdown voltage (BVDSS): | 700 V |
| Rise time: | 100 ns |
| Fall time: | 50 ns |
| Full-frequency switching frequency: | 132 kHz with FREQUENCY pin tied to SOURCE; 66 kHz with FREQUENCY pin tied to CONTROL |
| Maximum duty cycle: | 78% |
| Soft-start time: | 17 ms |
| Thermal shutdown temperature: | 135 °C min, 142 °C typ, 150 °C max |
| Thermal shutdown hysteresis: | 75 °C |
| Thermal resistance, Y package: | θJA = 80 °C/W θJC = 2 °C/W |
| Operating junction temperature range: | -40 °C to 150 °C |
Pinout:
Applications:
- A High Efficiency, 35 W, Dual Output – Universal Input Power Supply.
- A High Efficiency, 150 W, 250–380 VDC Input Power Supply.
- A High Efficiency, 20 W Continuous – 80 W Peak, Universal Input Power Supply.
- A High Efficiency, 65 W, Universal Input Power Supply.
Package Contents:
- 1x TOP254YN Offline Flyback Switcher IC TO-220-7C
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