Hm9922 switching buck LED constant current driver IC

HM9922 It's a high efficiency 、 High precision
Step down high power LED Constant current drive control chip .
HM9922 Peak value with fixed off time
Current control mode , The off time can be determined by external capacitance
Adjust , The working frequency can be changed according to user requirements
change .
HM9922 By adjusting the external current sampling
resistance , Can control high brightness LED The driving current of the lamp ,
send LED The brightness of the lamp reaches the expected constant brightness .
stay DIM End plus PWM The signal , Can be done
LED Light dimming .DIM Both ends support linear dimming .
HM9922 Internal integration VDD Pressure stabilizing tube
And over temperature protection circuit , Reduce peripheral components and improve system performance
System reliability .
HM9922 use SOT23-6 encapsulation .
characteristic
◆ Wide input voltage range ：3.1V~100V
◆ high efficiency ： As high as 93%
◆ Support PWM Dimming and linear dimming
◆ Maximum operating frequency ：1MHz
◆CS voltage ：250mV
◆ Chip power supply under voltage protection ：2.6V
◆ Turn off time is adjustable
◆ Intelligent over temperature protection
◆ built-in VDD Regulator tube
Application field
◆ Bicycle 、 Electric cars 、 Motorcycle lamp
◆ LED flashlight
◆LED Spotlight
◆ High Power LED lighting
◆LED Backlight