TOP253YN Integrated Off-Line Switcher IC TO-220-7C
The TOP253YN is a monolithic integrated off-line switcher that incorporates a 700V power MOSFET, a high-voltage switched current source, PWM control, oscillator, and protective circuitry into a single TO-220-7C package. This high level of integration eliminates many external components, simplifying power supply design. During normal operation, the duty cycle of the internal power MOSFET decreases linearly with increasing current at the CONTROL pin, enabling precise output regulation.
The device features multi-mode operation to optimize efficiency across the entire load range. At heavy loads, it operates in full-frequency PWM mode (selectable 66 kHz or 132 kHz). As load decreases, it smoothly transitions to variable frequency mode, then low-frequency PWM, and finally multi-cycle modulation mode at light loads. This significantly reduces no-load and standby power consumption, with typical no-load input power below 200 mW at 230 VAC, aligning with EcoSmart energy-efficient standards.
Features:
- Integrated 700V power MOSFET and control circuitry in one chip.
- Multi-mode PWM control for optimal efficiency across full load range.
- Frequency jittering for reduced EMI (approx. ±5 kHz at 132 kHz).
- Fully integrated 17 ms soft-start for controlled start-up.
- Cycle-by-cycle current limit with external programmability (30% to 100% of default).
- Line undervoltage (UV) and overvoltage (OV) detection with one resistor.
- Line feed‑forward with dual‑slope DC_MAX reduction for improved ripple rejection.
- Hysteretic or latching output overvoltage protection (OVP).
- Remote ON/OFF capability via VOLTAGE MONITOR or EXTERNAL CURRENT LIMIT pins.
- Hysteretic over‑temperature shutdown (142°C typical, 75°C hysteresis).
- Auto‑restart for fault conditions (open loop, short circuit).
- EcoSmart – less than 200 mW no‑load consumption at 230 VAC.
- Switching frequency selectable (132 kHz or 66 kHz) via FREQUENCY pin.
- Maximum duty cycle of 78%.
Specifications:
| Parameter | Value / Range |
|---|---|
| Drain voltage (breakdown): | 700 V (minimum) |
| Switching frequency (selectable): | 132 kHz or 66 kHz (±4%) |
| Maximum duty cycle: | 78% |
| CONTROL pin voltage (shunt regulation): | 5.8 V |
| CONTROL pin undervoltage lockout: | 4.8 V |
| Soft-start time: | 17 ms |
| Thermal shutdown temperature: | 142 °C |
| Thermal shutdown hysteresis: | 75 °C |
| No‑load input power (230 VAC): | < 200 mW |
| Lead frame (tab) electrical connection: | Internally connected to SOURCE pin |
| Package type: | TO‑220‑7C (Y package) |
| Operating junction temperature: | -40 °C to +150 °C |
Applications:
- High Efficiency, Dual Output – Universal Input Power Supply.
- High Efficiency, DC Input Power Supply (250‑380 VDC).
- High Efficiency, Continuous & Peak Power – Universal Input.
- High Efficiency, Universal Input Power Supply (e.g., 65 W, 19 V).
- Non‑ventilated Enclosed Adapters.
- Open Frame Power Supplies.
- Standby and Auxiliary Power Supplies.
Package Contents
- 1x TOP253YN Integrated Off-Line Switcher IC TO-220-7C