ZXSC310(2001) 查看數據表（PDF） - Zetex => Diodes

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ZXSC310
(Rev.:2001)

LED DRIVER SOLUTION FOR LCD BACKLIGHTING

Zetex => Diodes 

ZXSC310

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.

LCD backlight circuit

VIN = 3.3V / 5V

V CC

VDRIVE

STDN

I SENSE

Gnd

(Notes)

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.

Materials list

Ref

Value

Part Number

U1

N/A

Q1

N/A

ZXSC310E5

FMMT618

D1

N/A

C1

2.2␮F

R16

150m⍀

R17

250m⍀

L18

68µH

ZHCS1000

Generic

Generic

Generic

6Used for 3.3V input, ILED set to 20mA Ϯ10%.

7Used for 5V input, ILED to 20mA Ϯ10%.

8See Application section.

Manufacture

Zetex Plc

Zetex Plc

Zetex Plc

Various

Various

Various

Comments

Single cell converter, SOT23-5

Low VCE(sat) NPN, SOT23

1A Schottky diode, SOT23

0805 Size

1206 Size

1206 Size

Surface mount inductor

PROVISIONAL ISSUE A - SEPTEMBER 2001

6

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