The Silan SDH771XH manual provides specifications, pinout, protection features, and application guidelines for this non‑isolated buck LED constant‑current…
The SDH771XH is a high‑precision LED constant‑current driver chip that operates from 85 VAC to 265 VAC and integrates a 500 V high‑voltage MOSFET, eliminating the need for external start‑up resistors or capacitors. It offers accurate current regulation (±3 %), multiple protection functions such as short‑circuit, open‑circuit, over‑temperature, and over‑voltage protection, and works in a critical conduction mode for high efficiency.
The manual details electrical parameters, pin assignments, internal block diagram, and typical application circuits. It also lists package options (SOP‑7‑225‑1.27, DIP‑8A‑300‑2.54), thermal limits, and important safety notices for designers integrating the chip into LED lighting products such as bulbs and tube lights. This manual is written in Chinese.
| Input voltage range | 85 VAC ~ 265 VAC |
|---|---|
| Current accuracy | ±3 % |
| Maximum drain voltage | 500 V |
| Operating temperature range (junction) | -40 °C ~ 150 °C |
| Package type | SOP‑7‑225‑1.27 |
| OVP setting pin | ROVP pin with external resistor |
The chip operates from 85 VAC to 265 VAC.
OVP is set via the ROVP pin and a resistor to ground; a 30 kΩ resistor gives a typical OVP protection time of about 4.5 µs.
It includes short‑circuit, open‑circuit, over‑temperature, over‑voltage, and sampling‑resistor open‑circuit protection.
The device is rated for a junction temperature up to 150 °C.