TOP233YN Offline Switching Regulator 5.85V 1.5mA TO-220-7B
The TOP233YN belongs to the TOP Switch-FX family of power management ICs, designed to simplify the design of switch-mode power supplies (SMPS). It integrates a high-voltage power MOSFET, PWM controller, start-up circuitry, and multiple protection features into a single chip. This high level of integration reduces the need for external components, making it ideal for compact and cost-effective power supply designs such as adapters, chargers, and standby power supplies.
This IC operates directly from rectified AC mains, supporting universal input ranges. It includes advanced features like soft-start, auto-restart during fault conditions, thermal shutdown, and line over/under-voltage protection. The device also supports frequency jittering to reduce EMI and allows flexible configuration through its multi-function pin. Its TO-220-7B package provides better thermal performance, making it suitable for higher power applications.
Features:
- Integrated high-voltage power MOSFET.
- Built-in PWM controller.
- Soft-start for reduced start-up stress.
- Auto-restart and fault protection.
- Thermal shutdown protection.
- Line over-voltage and under-voltage protection.
- Frequency jittering for EMI reduction.
- Cycle skipping for low no-load power consumption.
- External current limit programmability.
- Remote ON/OFF capability.
- High efficiency operation.
- Reduced external component count.
Specifications:
| Parameter | Value / Range |
|---|---|
| Switching Frequency | 132kHz (66kHz optional) |
| Maximum Duty Cycle | 78% |
| Breakdown Voltage (BVdss) | 700V |
| Peak Drain Current | 1.6A |
| Typical RDS(on) | 4.0Ω (at Tj=25°C) |
| CONTROL Pin Voltage | 5.85V (shunt regulation) |
| CONTROL Pin Current | 1.5mA (enabled) |
| MULTI‑FUNCTION Pin Voltage | 2.6V (source) |
| Remote Off Consumption | 160mW (230VAC) |
| Soft‑Start Time | 10ms |
| Auto‑Restart Duty Cycle | 4% |
| Thermal Shutdown | 135°C with 70°C hysteresis |
| Operating Junction Temp | -40°C to +150°C |
Pinout:
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | CONTROL (C) | Error amplifier and feedback current input. Shunt regulator connection. Auto‑restart / compensation capacitor. |
| 3 | MULTI-FUNCTION (M) | OV/UV line sensing, line feed‑forward with DCmax reduction, external current limit setting, remote ON/OFF, synchronization. |
| 4 | SOURCE (S) | Output MOSFET source connection. Primary side circuit reference. |
| 5 | FREQUENCY (F) | Switching frequency select: tie to SOURCE for 132 kHz, tie to CONTROL for 66 kHz. |
| 7 | DRAIN (D) | High‑voltage power MOSFET drain. Internal start‑up bias current. Current limit sense point. |
Applications:
- AC-DC power adapters.
- Battery chargers.
- Standby power supplies.
- TV/DVD/set-top box power supplies.
- Industrial SMPS.
- LED drivers.
- Consumer electronics power supplies.
Package Included:
- 1x TOP233YN Five-terminal MOSFET 5.85V 1.5mA TO-220-7B.
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