LX1744 データシートの表示（PDF） - Microsemi Corporation

部品番号

コンポーネント説明

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LX1744

Dual Output Boost – LED Driver / LCD Bias

Microsemi Corporation 

INTEGRATED PRODUCTS

LX1744

Dual Output Boost – LED Driver / LCD Bias

PRODUCTION DATASHEET

EVALUATION BOARD

Jumper

Table 3: Jumper Position Assignments

Position

Function

J1

N/A

Close to adjust LED current with on-board potentiometer.

J2

N/A

Close to adjust VLCD with on-board potentiometer.

Remove the factory installed jumper and insert a 4~6cm wire loop

J3

N/A

(optional) to observe the inductor current waveform using a current

probe.

J4

N/A

Remove jumper to test open-circuit over-voltage protection implemented

with R1 and R2

Note: All pins are referenced to ground.

Table 4: Factory Installed Component List

Ref

Part Description

C1

CAPACITOR, 4.7µF, 1210, 6.3V

C2, C7 CAPACITOR, 4.7µF, 1210, 35V

C3, C4 CAPACITOR, 1000pF, 0805, 35V

C5, C6 CAPACITOR, (SPARE), See Note 1

C8, C9 CAPACITOR, 1µF, 0805, 35V

C10, C12 CAPACITOR, 0.1µF, 0805, 6.3V

C11

CAPACITOR, 2.2µF, 0805, 16V

CR1, CR2,

CR3, CR4

Microsemi UPS5819, SCHOTTKY, 1A, 40V, POWERMITE

LED1, LED2,

LED3, LED4

Microsemi UPWLEDxx, LED, Optomite

L1, L2

INDUCTOR, 47µH, 480mA, SMT

Q1

FDV303N MOSFET, 30V, SOT-23

R1, R3

RESISTOR, 1M, 1/16W, 0805

R2, R6

RESISTOR, 75K, 1/16W, 0805

R4

RESISTOR, 1K, 1/16W, 0805

R5

RESISTOR, 15, 1/16W, 0805

R7, R8

RESISTOR, 100K, POT, 1/16W, 0805

R9, R10 RESISTOR, 100K, 1/16W, 0805

R11, R12, R13 RESISTOR, 10K, 1/16W, 0805

U1

Microsemi LX1744CPW BOOST CONTROLLER

Notes

1. Use these locations to insert additional input and/or output capacitance.

Copyright © 2000

Rev. 1.1b, 2005-03-01

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

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