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AN2810 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2810
Description  6-row 85 mA LED driver with boost
Download  17 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2810 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2810
2/17
Doc ID 14893 Rev 1
Contents
1
LED7707 main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1
Boost section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2
Backlight driver section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
LED7707 demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Component list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Component assembly and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5
I/O interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
Recommended equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.1
SW1 fixed or adjustable switching frequency (FSW pin) . . . . . . . . . . . . . . 8
7.2
SW2 fault management mode (MODE pin) . . . . . . . . . . . . . . . . . . . . . . . . 9
7.3
SW3 enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8
Test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1
Quick startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.2
Open and shorted WLEDs fault testing . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.3
Device synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.4
Efficiency measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16


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