Technical datasheet for the PT4557A LED constant‑current driver with high‑voltage MOSFET integration and protection features.
The PT4557A is a high‑precision, non‑isolated buck‑type LED constant‑current driver. It integrates a 500 V power MOSFET, high‑voltage supply circuit, free‑wheel diode and sampling circuit, allowing a minimal external component count and compact design.
The device operates over a wide AC input range (85 Vac – 265 Vac), provides LED short‑circuit and over‑temperature protection, and is offered in an ASOP‑7 package for space‑constrained LED lighting applications such as candle lamps, globe lamps and tube lights. This manual is written in Chinese.
| Supply voltage range | 176 Vac – 264 Vac |
|---|---|
| Operating temperature range | -40 °C – 125 °C |
| Output current (150 V version) | 85 mA |
| LED short‑circuit protection | Enabled |
| Over‑temperature current reduction | Enabled |
| Package type | ASOP‑7 |
The chip includes LED short‑circuit protection and over‑temperature current reduction protection.
The device is specified to operate from –40 °C to +125 °C.
It is suitable for LED candle lamps, globe lamps, tube lights and other LED illumination.
The driver works with an AC input range of 85 Vac to 265 Vac.