LT1942(RevA) Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT1942
(Rev.:RevA)

Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver

Linear Technology 

LT1942

APPLICATIO S I FOR ATIO

SHUTDOWN

IQ < 1µA

START

VSHDN > 1V

AVDD ENABLED

VOFF DISABLED

VON DISABLED

FB1 > (97% OF 1.25V)

PGOOD GOES LOW

VOFF ENABLED

VON ENABLED

VSHDN < 0.4V

TFT SUPPLY

SEQUENCE

COMPLETE

CT TIMER STARTS

VCT ≥ VBE

OUTPUT DISCONNECT

PNP TURNS ON

1942 F01

Figure 1. Power Sequencing State Diagram

VC1

5V/DIV

VAVDD

5V/DIV

VOFF

10V/DIV

VD3

10V/DIV

VON

10V/DIV

VSHDN

1V/DIV

2ms/DIV

1942 F02

Figure 2. Power Sequencing During TFT Supply Start-Up

(Refer to Figure 4 Node Names)

1942fa

12

Share Link: