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BAT54 датащи(PDF) 6 Page - Diodes Incorporated

номер детали BAT54
подробное описание детали  LED DRIVER SOLUTION FOR LCD BACKLIGHTING
Download  16 Pages
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производитель  DIODES [Diodes Incorporated]
домашняя страница  http://www.diodes.com
Logo DIODES - Diodes Incorporated

BAT54 датащи(HTML) 6 Page - Diodes Incorporated

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REFERENCE DESIGNS
Three typical LED driving applications are shown.
Firstly a typical LCD backlight circuit, then maximum
brightness LED driving solution and lastly an optimised
battery life LED driving solution.
This application shows the ZXSC310 in a typical LCD
backlight application for Digital Still Cameras and
PDA’s. The input voltage for these backlight circuits are
usually fixed from the main system power, typically
3.3V or 5V. The LED’s are connected serially so that the
light is distributed uniformly in each LED. The current
provided to the LED’s can either be pulsed or DC. The
DC current is programmable via a sense resistor,
RSENSE, and is set to an optimum LED current of 20mA
for the reference designs. DC current is achieved by
adding a Schottky rectifying diode and an output
capacitor, as shown in the reference design below.
SEMICO NDUC TORS
ZXSC310
ISSUE 3 - SEPTEMBER 2007
6
VIN
V CC
V
=3.3V/5V
DRIVE
I SENSE
Gnd
S
TDN
LCD backlight circuit
Ref
Value
Part Number
Manufacture
Comments
U1
N/A
ZXSC310E5
Zetex Semiconductors
Single cell converter, SOT23-5
Q1
N/A
FMMT618
Zetex Semiconductors
Low V
CE(sat) NPN, SOT23
D1
N/A
ZHCS1000
Zetex Semiconductors
1A Schottky diode, SOT23
C1
2.2 F
Generic
Various
0805 Size
R1
(6)
150m
Generic
Various
1206 Size
R1
(7)
250m
Generic
Various
1206 Size
L1
(8)
68µH
Surface mount inductor
Materials list
(6) Used for 3.3V input, ILED set to 20mA 10%.
(7) Used for 5V input, ILED to 20mA 10%.
(8) See Application section.
(Notes)


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