The PAM2846 is a high-efficiency boost type LED driver. It is designed for large LCD panel that employs an array of LEDs as back light source.
The PAM2846 employs a current-mode step-up converter that drives six parallel strings of LEDs connected in multiple series. This built-in string current-control circuit achieves ±1% typical current matching between strings, which ensures even brightness for all LEDs. The device is able to adapt to different numbers of LEDs in each string or different forward voltage for different types of LEDs and keep the string current constant.
Separate feedback loops limit the output voltage if one or more LEDs open or short. The limit voltage of over voltage protection is adjustable by changing the feedback resistor ratio. The PAM2846 has features cycle-by-cycle current limit to provide consistent operation and soft-start capability. A thermal-shutdown circuit provides another level of protection.
The PAM2846 has a wide +4.8V to +28V input voltage range and provides adjustable full-scale LED current. The switching frequency of this device can be selected among 500kHz, 1MHz and 1.6 MHz according to the application requirements.
特点：
Six Constant-Current Output Channels
Parallel Channels Allow Higher Current per LED String
Maximum 40V Continuous Voltage Output Limit for Each Channel
Self-adaptive VOUT to Fit Different LED Number
Adjustable Constant LED Current
Drives 10 or more LEDs Each String as Long as the String Voltage Less Than 40V
Internal 2.5A Power MOSFET
Low 400mV Feedback Voltage at Full Current Improves Efficiency
Allows Digital PWM and Analog Dimming
Wide (100:1) PWM Dimming Range without Color Shift
Independent Dimming and Shutdown Control of the LED Driver
Open LED Protection: Adjustable Clamp Voltage
Short LED Protection
3 Frequencies Selection: 1.6MHz/1MHz/500kHz
Wide Input Voltage Range: 4.8V to 28V
Over Temperature Protection
Available in 24-pin 4mmx4mm QFN Package
Pb-free Package
应用：
White or RGB Backlighting for LCD TV, LCD Monitor, Notebook, Handy Terminals, and Avionics Displays Panels
LED Lighting Devices
公司:深圳市哲瀚电子科技有限公司
联系人:陈小姐
手机:13714441972
电话:0755-82549527/83259945/13714441972
传真:0755-83259945
地址:深圳市福田区深圳市福田区华强北街道深南中路3006号佳和大厦3C006
