isl97652 Intersil Corporation, isl97652 Datasheet - Page 11

• Manufacturer Part Number: isl97652
• Description: 4-channel Integrated Lcd Supply With Dual Vcom Amplifiers
• Manufacturer: Intersil Corporation

Typical Application Diagram
Applications Information
The ISL97652 provides a complete power solution for TFT
LCD applications. The system consists of one boost
converter to generate A
buck converter to provide voltage to logic circuit in the LCD
panel, integrated V
A
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.
VDD
3 x 10µF
100k
100k
R10
C
2x10µF
R9
T
*Optional components.
delay FET, V
NOTE: Separate PGND and SGND planes must be used, see PCB layout procedure section.
CON
IN
A
VDD
C
V
V
B
BIAS
IN
IN
0.1µF
C
A
VIN
VDD
V
4.7µF
C
OFF
OFF
C22
*
ON
ON-SLICE
C21
C2*
C3*
*
and V
VDD
340
BACK-PLANE
BACK-PLANE
R11
R12
R12
200
200
C
0.1µF
AVIN
voltage for column drivers, one
D3
OFF
100nF
11
and dual high speed VCOM
COMMON
COMMON
R5
40.2k
R6
453k
6.8µH
L2
D4
470nF
C
0.1µF
4.7nF
charge pump controllers,
SSB
CB
10k
D5
C
220nF
0.1µF
C
REF
N
R
C
CB
CB
FBN
FREQ
SUP
REF
DRVN
POS1
NEG1
OUT1
POS2
NEG2
OUT2
AVIN
CBOOT
SWB1
SWB2
FBB
SSB
VCB
VDC
C
4.7µF
DC
GND
PVIN1 PVIN2
OGND
ISL97652
AGND
6.8µH
L1
PGND3
PGND2
PGND1
VGHM
VDPM
DRVP
VFLK
DLY1
DLY2
EN1
SWO
SW1
SW2
VGH
VGL
FBP
SWI
EN2
SUI
VC
CE
RE
FB
SS
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:
Where D is the duty cycle of the switching MOSFET.
V
----------------------- -
BOOST
V
IN
CE
10nF
D1
C5*
0.1µF
C
C4*
=
SUI
GATE DRIVER
SUPPLY
C
0.1µF
------------ -
1 D
P
V
–
1
MAIN
10k
R
C
0.1µF
C
D2
C
3 x
10µF
1x100nF
OUT
R7
232k
R8
10k
C
0.1µF
*
D1
D7
V
226k
ON
R1
C12
D6
C
4.7µF
C
0.1µF
ON
SS
R2
20k
*
C11
A
VDD
R4
C
4.7nF
R3
0
C
*
R
10k
E
4 x 10µF
C
AVDD
November 2, 2007
A
VDD
FN9287.1
(EQ. 1)