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.