ø 平板显示器led背光灯


ø 自行车灯


ø led射灯


ø  强光手电筒

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qx9921是一款高效率,稳定可靠的高亮度led灯恒流驱动控制芯片,内置高精度比较器,固定关断时间控制电路,恒流驱动电路等,特别适合大功率、多个高亮度led灯串的恒流驱动。

qx9921采用固定关断时间的峰值电流控制方式,其工作频率最高可达1mhz,可使外部电感和滤波电容体积减小,效率提高,节省pcb面积。关断时间可通过外部电容进行调节,工作频率也可根据用户要求进行调节。在en端加pwm信号,可调节led灯的亮度。

qx9921通过调节外置电流检测电阻的阻值来设置流过led灯的电流,支持外加电压线性调光,流过led灯的电流可从几十毫安到2.5安培变化。

qx9921采用esop8封装,散热片内置接sw脚。

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内置mos降压型大功率led恒流驱动器 qx9921-凯发网址登录

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built-in mos step-down high-power led constant current driver qx9921

qx9921 is a high efficiency, stable and reliable high-brightness led lamp constant current drive control chip, built-in high-precision comparator, fixed off-time control circuit, constant current drive circuit, etc., especially suitable for high-power, multiple high-brightness led lights string constant current drive.

qx9921 adopts the peak current control method with fixed off time, and its operating frequency can be up to 1mhz, which can reduce the volume of external inductors and filter capacitors, improve efficiency, and save pcb area. the turn-off time can be adjusted by an external capacitor, and the operating frequency can also be adjusted according to user requirements. add a pwm signal to the en terminal to adjust the brightness of the led light.

qx9921 sets the current flowing through the led lamp by adjusting the resistance of the external current detection resistor. it supports linear dimming of the applied voltage. the current flowing through the led lamp can vary from tens of milliamperes to 2.5 amperes.

qx9921 adopts esop8 package, and the heat sink is built-in to sw pin.


ø built-in 100v power tube

ø wide input voltage range: 5v ~ 100v

ø high efficiency: up to 92%

ø maximum working frequency: 1mhz

ø peak current sampling voltage: 250mv

ø brightness adjustable: pwm dimming at en and linear dimming at dim

ø adjustable off time

ø built-in current sampling leading-edge blanking circuit


typical application circuit diagram

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stay tuned for updates!

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