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

" /> qx9920 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.

qx9920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。关断时间最小为620ns,并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。qx9920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,从而设置led灯的亮度,流过led灯的电流可从几十毫安到2.5安培变化。

qx9920采用sot23-6封装。


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qx9920

qx9920 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 the constant current drive of the string.

the qx9920 uses a peak current control method with a 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 is at least 620ns and can be adjusted by external capacitors. 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. qx9920 sets the current flowing through the led lamp by adjusting the resistance of the external current detection resistor, thereby setting the brightness of the led lamp. the current flowing through the led lamp can vary from tens of milliamperes to 2.5 amperes.

qx9920 is available in sot23-6 package.


ø wide input voltage range: 2.5v ~ 100v

ø high efficiency: up to 90%

ø maximum working frequency: 1mhz

ø chip power supply undervoltage protection: 2.5v

ø peak current sampling voltage: 250mv

ø brightness adjustable: en terminal plus pwm signal

ø adjustable off time

øbuilt-in current sampling leading-edge blanking circuit


stay tuned for updates!

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