LXE1686-0X Просмотр технического описания (PDF) - Microsemi Corporation

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LXE1686-0X

INVERTER EVALUATION BOARD

Microsemi Corporation 

LXE1686-0x

INVERTER EVALUATION BOARD

VIN POWER

CN1

VIN LOGIC

PWR GND

LINFINITY

LXE1686-0X

F1

U2

C2

U1

TP4

C2A

TIA 7W

T1B 4W

GND

CN2A

CN2A1

PCB CN2B

CAPACITOR CN2B1

+V ENABLE FREQ ADJ

TP2

T1D 2.4W

BRITE CNTL

U3

CURRENT

ADJ TP3

BRITE

ADJ

BRITE RTN

U4

VERT SYNC

GND

TP1

TP1A

BRITE INPUT

CONDITIONING CIRCUIT

U5

TIME-OUT CIRCUIT

LX1686 INVERTER EVALUATION/DESIGN BOARD

CN2C

CN2C1

SPARE COMPONENTS

DESCRIPTION

The LXE1686-0x CCFL Inverter Evaluation Boards

are designed to demonstrate Linfinity’s LX1686

Backlight Controller IC. It consists of a fully

assembled and tested inverter circuit board. This

design guide complements the LX1686 controller

application note AN-13 that discusses the overall

inverter design considerations. The purpose of the

evaluation board is to allow a designer to quickly

modify the basic inverter circuit to match his LCD

panel requirements. It will allow easy customization

of the inverter’s input and output characteristics to

optimize the inverter design.

LX1686 INVERTER TOPOLOGY

The LX1686 based inverter is a single-stage controller

that regulates lamp current for load and line variation

using a high frequency (60 to 100kHz) PWM

switching technique.

Wide range digital dimming is achieved in a similar

(but separate) manner using a low frequency (100 to

1000Hz) PWM lamp current burst mode technique.

Together, this topology can offer the lowest power

consumption and highest electrical operating

efficiencies achievable from a DC to AC CCFL

inverter.

As with any high performance device, component

load matching is a must to gain the most efficiency

possible. Proper output transformer selection (see

‘Output Transformer Selection’) based on input

voltage and CCFL load should be given careful

consideration, for best inverter performance.

EVALUATION BOARD FEATURES

• Brightness control input conditioning: linear DC,

potentiometer and/or PWM op-amp circuit

• Over-voltage sensing: output voltage limiting, open

load protection circuit

• Over-current sensing: output current limiting,

shorted load/output protection circuit

• Open/short circuit output disabling: timeout output

disabling comparator circuit

• Input interface: full functionality, Banana jacks or 8

pin Molex connector

• Output connector: fly wire or choose from a variety

of most the common industry standards

• Output transformer: choose from three power level

transformer offerings from LINFINITY

LX1686 CONTROLLER FEATURES

• Vertical frame rate synchronization input: pro-

grammable to accept 45 to 500Hz

• Brightness control input: linear DC control input

• Direct PWM dimming input: logic level 100 to

1000Hz PWM, lamp current burst mode

Copyright © 2000

Rev 1.0c, 2000-08-31


 



Page 2

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