TOP225YN Three-terminal Off-line PWM Switch 5.7V 1.4mA TO-220/3
The TOP225YN is a member of the TOPSwitch family, designed to simplify the implementation of offline switch-mode power supplies (SMPS). It integrates a high-voltage power MOSFET, PWM controller, oscillator, and control circuitry into a single device, significantly reducing the number of external components required. This makes it an excellent choice for cost-effective and compact power supply designs.
This IC operates directly from rectified AC mains and is typically used in flyback converter configurations. It provides high efficiency, low standby power consumption, and reliable performance through built-in protection mechanisms such as thermal shutdown, current limiting, and auto-restart. The TOP225YN is widely used in consumer electronics and industrial applications where stable and efficient power conversion is required.
Features:
- Integrated high-voltage power MOSFET.
- Built-in PWM control circuitry.
- Minimal external component requirement.
- Internal oscillator and frequency control.
- Auto-restart protection.
- Thermal shutdown protection.
- Current limiting protection.
- High efficiency operation.
- Compact and robust design.
Specifications:
| Parameter | Value |
|---|---|
| Switching Frequency | 100 kHz |
| Maximum Duty Cycle | 67% (Min 64%, Max 70%) |
| Output Power (Single Voltage 100/115/230 VAC) | 100 W |
| Output Power (Wide Range 85-265 VAC) | 60 W |
| Shunt Regulator Voltage (CONTROL pin) | 5.7 V |
| External Bias Current (IB) | 2.0 mA |
| CONTROL Pin Charging Current (Start-up, Vc=0V) | -1.9 mA |
| Dynamic Impedance (ZC) | 15 Ω |
| ON-State Resistance (RDS(ON), 25°C) | 4.5 Ω |
| ON-State Resistance (100°C) | 7.5 Ω |
| Current Limit (Typical, 25°C) | Not explicitly given for TOP225; refer to characteristic |
| Thermal Shutdown Temperature | 135 °C |
| Breakdown Voltage (DRAIN pin) | 700 V (Min) |
| Auto-restart Duty Cycle | 5% |
| CONTROL Pin Voltage Upper Threshold | 5.7 V |
| CONTROL Pin Voltage Lower Threshold | 4.7 V |
Pinout:
| Pin No. | Pin Name | Description |
|---|---|---|
| 1 | DRAIN | High-voltage MOSFET drain |
| 2 | SOURCE | Ground / return |
| 3 | CONTROL | Feedback and control input |
Applications:
- AC-DC adapters.
- Battery chargers.
- TV and monitor power supplies.
- Standby power supplies.
- Industrial power systems.
- Household electronics power units.
Packages Included:
- 1x TOP225YN Three-terminal Off-line PWM Switch 5.7V 1.4mA TO-220/3.