TOP222P Three-terminal Off-line PWM Switch 9V 100mA DIP-8
The TOP222P is part of the TOPSwitch-II family of three-terminal off-line PWM switches. It integrates a high-voltage power MOSFET, PWM controller, high-voltage startup circuit, loop compensation, current limiting, auto-restart, and thermal protection into a single IC, reducing the number of external components required for a switching power supply. The device is designed for high-efficiency power conversion and can be used in flyback, forward, boost, and buck topologies.
The TOP222P uses an 8-lead PDIP package, with multiple SOURCE pins providing the primary-side return and helping transfer heat directly into the PCB. It operates with primary-side or optocoupler feedback and supports both discontinuous and continuous conduction modes. The internal oscillator operates at a nominal 100 kHz, while cycle-by-cycle current limiting, auto-restart, and thermal shutdown provide protection during overload and fault conditions.
Features:
- Integrated high-voltage power MOSFET and PWM controller.
- Three-terminal switching architecture.
- Integrated high-voltage startup circuit.
- Built-in current limiting.
- Auto-restart protection.
- Thermal shutdown protection.
- Integrated loop compensation functions.
- Supports primary-side and optocoupler feedback.
- Suitable for flyback, forward, boost, and buck topologies.
- Supports continuous and discontinuous conduction operation.
- 8-lead PDIP package with PCB heat transfer through the SOURCE pins.
- Designed for reduced external component count.
- Controlled MOSFET gate drive for reduced common-mode EMI.
Specifications:
| Specification | Value |
|---|---|
| Part Number | TOP222P |
| Family | TOPSwitch-II |
| Function | Three-terminal off-line PWM switch |
| Package | 8-lead PDIP |
| Package Outline | P08A |
| Package Type | Through-hole |
| Internal Power Device | High-voltage MOSFET |
| Nominal Oscillator Frequency | 100 kHz |
| Input Range | 85–265 VAC universal input* |
| Single-Voltage Input Range | 100/115/230 VAC ±15% |
| Maximum DRAIN Voltage | 700 V |
| CONTROL Voltage | -0.3 to 9 V |
| CONTROL Current | 100 mA maximum |
| Operating Junction Temperature | -40 to 150 °C |
| Thermal Shutdown Temperature | Typically 135 °C |
| Shunt Regulator Voltage | 5.5–6.0 V, 5.7 V typical |
| Maximum Practical Output Power, 85–265 VAC | 15 W |
| Maximum Practical Output Power, 100/115/230 VAC ±15% | 25 W |
| Current Limit, Typical | 1.50 A |
| Initial Current Limit, Typical | 0.50 A |
| Breakdown Voltage | 700 V minimum |
| Source Pins | Multiple SOURCE connections for the PDIP package |
Pinout:
| Pin | Function | Description |
|---|---|---|
| 1 | SOURCE | Primary-side circuit common and reference |
| 2 | SOURCE | Primary-side circuit common and reference |
| 3 | SOURCE (HV RTN) | High-voltage MOSFET source return |
| 4 | CONTROL | Feedback, bias supply, compensation, and auto-restart connection |
| 5 | DRAIN | High-voltage MOSFET drain connection |
| 6 | SOURCE (HV RTN) | High-voltage MOSFET source return |
| 7 | SOURCE (HV RTN) | High-voltage MOSFET source return |
| 8 | SOURCE (HV RTN) | High-voltage MOSFET source return |
Applications:
- AC-DC switching power supplies.
- Flyback converters.
- Standby power supplies.
- Compact power adapters.
- Consumer electronic power supplies.
- TV and monitor power supplies.
- Audio amplifier power supplies.
- Auxiliary and standby power circuits.
- Low-power universal-input power supplies.
- Isolated power supplies using optocoupler feedback.
Package Included:
- 1 × TOP222P Three-terminal Off-line PWM Switch 9V 100mA DIP-8.