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QX9920
Wide input voltage range: 2.5V~100V High efficiency: up to 90% Maximum operating frequency: 1MHz Undervoltage protection for chip power supply: 2.5V Peak current sampling voltage: 250mV Adjustable brightness: PWM signal added to EN terminal Adjustable off time Built-in current sampling leading edge blanking circuit
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- Product Description
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- Commodity name: QX9920
- 封装: SOT23-6
- 品牌: Quanxin
Wide input voltage range: 2.5V~100V High efficiency: up to 90% Maximum operating frequency: 1MHz Undervoltage protection for chip power supply: 2.5V Peak current sampling voltage: 250mV Adjustable brightness: PWM signal added to EN terminal Adjustable off time Built-in current sampling leading edge blanking circuit
QX9920
The QX9920 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 QX9920 uses a peak current control method with a fixed off-time. Its operating frequency can reach up to 1MHz, allowing for smaller external inductors and filter capacitors, improved efficiency, and reduced PCB area. The minimum off-time is 620ns and can be adjusted via an external capacitor; the operating frequency can also be adjusted according to user requirements. A PWM signal applied to the EN pin allows for adjustment of the LED brightness. The QX9920 sets the current flowing through the LEDs, and thus the LED brightness, by adjusting the value of the external current sensing resistor. The current flowing through the LEDs can range from tens of milliamps to 2.5 amps.
The QX9920 is packaged in a SOT23-6 package.
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