PT4554D is a high-precision non-isolated buck-type LED constant current driver chip. It works in quasi-resonant mode and is suitable for non-isolated buck-type LED constant current power supplies with input voltage range of 85Vac~265Vac. It integrates 500V power MOS, high-voltage power supply circuit, and sampling circuit. It does not require start-up resistors and VDD capacitors, and has a high-reliability constant current control mode and comprehensive protection functions. The chip features high-voltage single-chip integration, inductor current quasi-resonant mode, high efficiency, high current accuracy, excellent linear adjustment rate and load adjustment rate.
PT4554D is a non‑isolated buck‑type LED constant‑current driver chip designed for 85Vac‑265Vac input voltage range. The chip integrates a 500V power MOS, high‑voltage supply circuitry and current‑sampling circuit, allowing a very small bill of materials and high efficiency (up to 93%).
The device offers +/-3% current accuracy, excellent line and load regulation, and protection functions such as LED short‑circuit protection and over‑temperature current reduction. It is available in SOT33‑4, SOP‑7 and ESOP‑8 packages for various LED lighting applications. This manual is written in Chinese.
| Input voltage range | 85Vac~265Vac |
|---|---|
| Maximum efficiency | 93% |
| Operating temperature range | -40~125 °C |
| Power MOS voltage rating | 500 V |
| Switching frequency | 50 kHz |
| Supported packages | SOT33‑4, SOP‑7, ESOP‑8 |
It supports a wide input range from 85Vac to 265Vac.
The chip includes LED short‑circuit protection and over‑temperature current reduction protection.
The device can achieve up to 93% efficiency.