The QX9910 is a constant‑current LED driver IC designed for high‑brightness LED strings. It features an internal high‑precision comparator, off‑time control circuit, and programmable current range from a few milliamps to 1 A. The device operates from a wide input voltage range (2.5 V–400 V) and can switch at frequencies up to 2.5 MHz, allowing reduction of external inductors and capacitors.
Typical applications include 220 V AC powered LED lighting, RGB display panels, backlights for flat‑panel displays, traffic‑signal LEDs, and general constant‑current sources. Brightness can be adjusted via an external PWM signal on the EN pin or by changing the external resistor that sets the drive current. The IC includes protection features such as ESD rating of 2000 V and low standby current. This manual is written in Chinese.
| Input voltage range | 2.5 V–400 V |
|---|---|
| Maximum switching frequency | 2.5 MHz |
| Programmable LED drive current | few mA to 1 A |
| Efficiency | >90 % |
| Operating temperature range | -20 °C to 85 °C |
| Storage temperature range | -40 °C to 165 °C |
| ESD rating (human‑body model) | 2000 V |
| Standby current (EN low) | <10 µA (≈1 µA) |
| Operating current (typical) | 0.5‑1 mA |
The QX9910 can operate at a switching frequency up to 2.5 MHz.
Brightness can be adjusted either by changing the external resistor that sets the drive current or by applying a PWM signal to the EN pin.
The device accepts an input voltage from 2.5 V up to 400 V.