ISL97652 데이터 시트보기 (PDF) - Intersil

부품명

상세내역

일치하는 목록

ISL97652

4-Channel Integrated LCD Supply with Dual VCOM Amplifiers

Intersil 

ISL97652

Typical Application Diagram

VIN

CIN

3 x 10µF

VIN

CVIN

0.1µF

C2*

100nF

R5

40.2k

L1

6.8µH

PVIN1 PVIN2

FREQ

SUP

REF

CREF

220nF

SW1

SW2

FB

VGL

SWI

SUI

AVDD

R9

100k

C3*

VOFF

COFF

4.7µF

R6

453k

D4

D3

FBN

CN

0.1µF

DRVN

POS1

SWO

VC

SS

DLY1

DLY2

CE

R10

100k

COMMON

BACK-PLANE

NEG1

OUT1

POS2

RE

VGHM

AVDD

TCON BIAS

CB

2x10µF

COMMON

BACK-PLANE

CAVIN

0.1µF 470nF

L2 CB

C21

6.8µH

*

R11

340

D5

C22

*

R12

200

CSSB

0.1µF

10k

NEG2

OUT2

AVIN

CBOOT

SWB1

SWB2

VGH

FBP

PGND3

PGND2

PGND1

DRVP

FBB

VFLK

SSB

VDPM

VCB

EN2

VDC GND OGND AGND EN1

RCB

4.7nF CCB

CDC

4.7µF

D1 VMAIN

C11

COUT

3x

*

10µF

R1

1x100nF 226k

CSUI

0.1µF

RC

10k

CE

10nF

CD2

0.1µF

*

C12

R2

20k

CD1

0.1µF

CSS

0.1µF

R3

0

R4 *

CC

4.7nF

AVDD

CAVDD

4 x 10µF

GATE DRIVER

SUPPLY

RE

VON

10k

R7

C4*

232k

CON

4.7µF

R8

C5*

10k

D7

CP

D6

0.1µF

AVDD

*Optional components.

NOTE: Separate PGND and SGND planes must be used, see PCB layout procedure section.

Applications Information

The ISL97652 provides a complete power solution for TFT

LCD applications. The system consists of one boost

converter to generate AVDD voltage for column drivers, one

buck converter to provide voltage to logic circuit in the LCD

panel, integrated VON and VOFF charge pump controllers,

AVDD delay FET, VON-SLICE and dual high speed VCOM

amplifiers. With the high output current capability, this part is

ideal for big screen LCD TV and monitor panel application.

The integrated boost converter and buck converter operate

at either 650kHz or 1.3MHz which allow the use of multilayer

ceramic capacitors and low profile inductor which result in

low cost, compact and reliable system.

Boost Converter

The boost converter is a current mode PWM converter

operating at either 650kHz or 1.3MHz. 650kHz operation

allows operation down to lower duty cycles. It can operate in

both discontinuous conduction mode (DCM) at light load or

when operating duty cycle is lower than the minimum duty

cycle and continuous mode (CCM). In continuous current

mode, current flows continuously in the inductor during the

entire switching cycle in steady state operation. The voltage

conversion ratio in continuous current mode is given by:

V-----B----O----O-----S----T-

VIN

=

------1-------

1–D

(EQ. 1)

Where D is the duty cycle of the switching MOSFET.

11

FN9287.1

November 2, 2007

Share Link: