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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
QX9921 is a highly efficient, stable, and reliable high-brightness LED constant current driver control chip, with a built-in high-precision comparator, fixed off-time control circuit, constant current drive circuit, etc., making it particularly suitable for constant current driving of high-power, multiple high-brightness LED strings.
QX9921 uses a fixed off-time peak current control method. Its operating frequency can reach up to 1MHz, which can reduce the size of external inductors and filter capacitors, 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 applying a PWM signal to the EN pin, the brightness of the LED light can be adjusted.
QX9921 sets the current flowing through the LED light by adjusting the resistance of the external current sense resistor. It supports external voltage linear dimming, and the current flowing through the LED light can vary from tens of milliamperes to 2.5 amperes.
QX9921 adopts the ESOP8 package, with the heat sink internally connected to the SW pin.
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