Buck Type High-power LED Driver - QXMD
Description
QX9920 Buck Type High-power LED Driver
General Description
QX9920 is a highly stable and reliable constant-current LED driver with high efficiency.
It is especially suited to drive several high power and high luminance LEDs in series.
QX9920 uses fixed off-time and peak current control mode and its operating frequency can vary up to 1MHz, which not only reduces the dimensions of inductor, capacitor and PCB but also improves efficiency.
The minimum off-time is 620ns and the off-time can be adjusted by changing the external capacitor, and the operating frequency also can be adjusted according to the need of customers.
QX9920 regulates the current flowing through LEDs to set the luminance of LEDs by changing the external resistor, and the current can vary from tens of mA to 2.
5A, on the other hand, the luminance of LEDs also can be regulated by a PWM signal applied to EN pin.
Features
Wide Range Input Voltage:2.
5V to 100V High Efficiency: Up to 90% Maximum Operating Frequency: 1MHz UVLO Voltage: 2.
5V Peak Current Sense Voltage: 250mV Adjustable Luminance With PWM
Signal Applied to EN Pin Adjustable Off-time Internal Current Sampling Leading Edge
Blanking Circuit
Applications
LED Backlight of Flat Panel Display Bike Light LED Spotlight Very Bright Flashlight
Typical Application
VIN
DFW
L1
R1 CIN
DZ
CVDD
VDD
DRV
EN QX9920
TOFF VSS
CS
COFF
RCS
QX9920_DS02EN
Figure 1：Typical Application Circuit Diagram of QX9920
QX Micro Devices Co.
, Ltd.
www.
qxmd.
com.
cn
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Ordering Information
Type Number
QX9920 Buck Type High-power LED Driver
QX9920
Package Marking Pin Assignment
LEDA XXXX
Lot Number Date
CS TOFF VDD 654
LEDA XXXX
12 DRV VSS
3 EN
SOT23-6
QX9920_DS02EN
QX Micro Devices Co.
, Ltd.
www.
qxmd.
com.
cn
2 of 9
QX9920 Buck Type High-power LED Driver
Pin Description
Pin Pin Name
1 DRV 2 VSS 3 EN 4 VDD 5 TOFF 6 CS
Pin Type
Output Ground Input Supply Input Input
Description
Driving Pin Ground
Chip Enable Pin（Active High） Powe...
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