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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PAM2845 датащи(PDF) 1 Page - Power Analog Micoelectronics |
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PAM2845 датащи(HTML) 1 Page - Power Analog Micoelectronics |
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1 / 14 page  PAM2845 40V High Power Boost Convertor with 6 Channel Constant Current Source , Power Analog Microelectronics Inc 1 www.poweranalog.com 08/2008 Rev 1.0 Features Applications ±1% Typical Current Matching between Strings current matching Separate feedback loops limit the output voltage if one or more LEDs open or short. The PAM2845 has features cycle-by-cycle current limit to provide c onsistent 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 PAM2845 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 PAM2845 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 PAM2845 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 Six Constant-Current Output Channels Parallel Channels Allow Higher Current per LED String Maximum 40V Continuous Voltage Output Limit for Each Channel Adjustable Constant Output Voltage 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 Allows Digital PWM and Analog Dimming Wide (100:1) PWM Dimming Range without Color Shift Independent Dimming and Shutdown Control of the LED Driver 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 PAM2845 ENA PWMD Iset GND PGND FB SW VIN VIN: 4.8V to 28V L Total 10 LEDs per string LED1 LED2 LED3 LED4 LED5 LED6 Vcc-driver Fsel PWMD Fsel VC Vcc-5V 1F μ 1F μ 10kΩ PGND SW PGND SW R 1 R 2 100nF 22 H μ 3A/40V 270kΩ 9.1kΩ 10 F μ 10 F μ |
Аналогичный номер детали - PAM2845 |
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Аналогичное описание - PAM2845 |
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