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PAM2846 Datasheet(PDF) 1 Page - Power Analog Micoelectronics |
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PAM2846 Datasheet(HTML) 1 Page - Power Analog Micoelectronics |
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1 / 14 page  Features Applications ±1% Typical Current Matching between Strings current matching 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 f eedback r esistor r atio. 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. n n White or RGB Backlighting for LCD TV, LCD Monitor, Notebook, Handy Terminals, and Avionics Displays Panels LED Lighting Devices Description 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 between strings, which ensures even brightness for all LEDs. 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 1.6MHz according to the application requirements. n n n n n n n n n n n n n n n n n n 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 n Typical Application PAM2846 Integrated 6 String LED Boost Type Driver , Power Analog Microelectronics Inc 1 www.poweranalog.com 07/2008 Rev 1.2 PAM2846 ENA PWMD Iset GND PGND OVP SW VIN VIN: 4.8Vto28V L Total 10 LEDs per string LED1 LED2 LED3 LED4 LED5 LED6 Vcc-driver Fsel PWMD Fsel VC Vcc-5V 1μ 1μ 10K PGND SW PGND SW R 1 R 2 0-10k 100nF 22 H μ 3A/40V 300k 9.2k |
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Similar Description - PAM2846 |
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