6-row / 30-mA LED driver with boost converter for the backlight of LCD panels
description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Table 4.Faults management summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1Table 5.Test board jumpers function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Table 6.Test boards switches functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Table 7.Test board test-points function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Table 8.Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21AN2809LED7706 - main features 5/221 LED7706 - main features1.1 Boost section4.5- to 36-V input voltage rangeInternal power MOSFETInternal +5 V LDO for device supplyUp to 36-V output voltageConstant frequency peak current-mode control200-kHz to 1-MHz adjustable switchin features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.1Boost section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.2Backlight driver section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52LED7706 demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Component list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74Components assembly and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85I/O interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96Recomended equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107.1SW1 fixed or adjustable switching frequency (FSW pin) . . . . . . . . . . . . . February 2009 Rev 21/22AN2809Application note6
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Relevant Keywords:
38373635343332313029P19, J39PCB, V.10, 52LED7706, P315, VINVIN-GNDDIM, 32P6, IN24V, SW660kHz, 464544434241P17, P13P2, VIN24V, 2827262524232221P203, IN12V, ROW2, 4039P18, LED7706, VIN12V, 21AN2809LED7706, DIP-639, ROW1, WLEDs150mA, 3v1WLEDs, J7PCB, VBOOST34V, 1P713, AN2809I/O, P812, W1W29P21P12
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