el7641 Intersil Corporation, el7641 Datasheet - Page 18

• Manufacturer Part Number: el7641
• Description: Tft-lcd Dc/dc With Integrated Amplifiers
• Manufacturer: Intersil Corporation

Typical Application Circuit
8. A signal ground plane, separate from the power ground
plane and connected to the power ground pins only at the
exposed die plate, should be used for ground return
connections for feedback resistor networks (R1, R11,
R41) and the V
C7 and the integrator capacitor C23.
V
CN
V
(-8V)
NEG
470nF
0.1µF
R22
R21
Q21
REF
82kΩ
10kΩ
0.1µF
700Ω
capacitor, C22, the C
(2.6V-5.5V)
V
V
CONTROL
V
V
COM SET4
COM SET2
COM FB4
COM FB2
V
10µF
18
IN
V
V
INPUT
V
C1
COM4
COM2
220nF
MAIN
2.2nF
470nF
180Ω
10Ω
COMP
DRVN
NEG4
NEG2
OUT4
POS4
OUT2
POS2
A
FBN
REF
CTL
DEL
VDD
IN
DELAY
EL7640, EL7641, EL7642
OP4
OP2
capacitor
V
NEG
REG
REF
+
+
CN
-
-
AGND
L1
BOOST
D21
REG
6.8µH
POS
CTL
SW
0.1µF
A demo board is available to illustrate the proper layout
implementation.
9. Minimize feedback input track lengths to avoid switching
+
+
+
-
-
-
noise pick-up.
OP3
OP5
OP1
LX
0.1µF
0.1µF
FB
PGND
GND
DRVP
FBP
SRC
COM
DRN
OUT3
POS3
NEG5
OUT5
POS5
NEG1
OUT1
POS1
D1
D11
D12
10.2kΩ
DRIVER IC
TO GATE
100kΩ
R2
R1
V
V
V
V
V
V
V
V
1kΩ
R
GAMMA
GAMMA SET
COM FB3
COM3
COM SET3
COM FB1
COM1
COM SET1
10
64.9kΩ
700Ω
0.1µF
R12
R11
V
CP
C2
R
C
Q11
7
7
182kΩ
9.76kΩ
R
68kΩ
OPEN
C
0.1µF
OPEN
8
8
10µFx2
A
1kΩ
(9V)
R
VDD
9
0.1µF
470nF
V
CP
(24.5V)
V
A
February 22, 2006
ON
VDD
FN7415.2