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QX9921
Ø Built-in 100V power transistor Ø Wide input voltage range: 5V~100V Ø High efficiency: up to 92% Ø Maximum operating frequency: 1MHz Ø Peak current sensing voltage: 250mV Ø Adjustable brightness: PWM dimming via EN pin and linear dimming via DIM pin Ø Adjustable off-time Ø Built-in leading-edge blanking circuit for current sampling
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- Product Description
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- Commodity name: QX9921
- 封装: ESOP8
- 品牌: Quanxin
Ø Built-in 100V power transistor Ø Wide input voltage range: 5V~100V Ø High efficiency: up to 92% Ø Maximum operating frequency: 1MHz Ø Peak current sensing voltage: 250mV Ø Adjustable brightness: PWM dimming via EN pin and linear dimming via DIM pin Ø Adjustable off-time Ø Built-in leading-edge blanking circuit for current sampling
Built-in MOS Buck High-Power LED Constant Current Driver QX9921
The QX9921 is a high-efficiency, stable and reliable high-brightness LED constant current driver control chip. It integrates a high-precision comparator, a fixed off-time control circuit, and a constant current drive circuit, making it particularly suitable for constant current driving of high-power, multiple high-brightness LED strings.
The QX9921 adopts a peak current control method with a fixed off-time. Its operating frequency can reach up to 1MHz, which can reduce the size of the external inductor and filter capacitor, improve efficiency, and save PCB area. The off-time can be adjusted by an external capacitor, and the operating frequency can also be adjusted according to user requirements. By adding a PWM signal to the EN pin, the brightness of the LED can be adjusted.
The QX9921 sets the current flowing through the LED by adjusting the value of the external current sensing resistor. It supports external voltage linear dimming, and the current flowing through the LED can vary from tens of milliamps to 2.5 amps.
The QX9921 uses an ESOP8 package, with a heat sink built into the SW pin.
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