AAT2825 Advanced Analogic Technologies, AAT2825 Datasheet - Page 21

• Manufacturer Part Number: AAT2825
• Description: (AAT2822 - AAT2825) TFT-LCD DC-DC Converter
• Manufacturer: Advanced Analogic Technologies

2822.2010.02.1.0
SystemPower
WLED -
WLED +
VGL (negative)
Stage 2
Stage 3
Stage 4
R5
10k
1 2
1 2
1 2
J4
J5
J6
WEN
TM
2.2μF
OVP
VIN
50V
C5
0.22μF
R4
Adj.
J2
6.3V
C7
C18
0.22μF
25V
C19
0.22μF
50V
C20
0.22μF
50V
C21
0.22μF
50V
6.04k
R10
R9
Adj.
TFT-LCD DC-DC Converter with WLED Driver and VCOM Buffer
D2
Figure 6: AAT2822IBK Evaluation Board Schematic.
10μF
2
1
5
4
2
1
5
4
1.2V
16V
VIN-WLED
C4
BAT54SDW
BAT54SDW
A2
A3
0V
L2
2.2μH
PWM
R20
FBN
0
DRVN
6
3
6
3
J3
C12
0.1μF
25V
C13
0.1μF
50V
WLX
w w w . a n a l o g i c t e c h . c o m
VIN
C14
0.1μF
50V
C15
0.1μF
50V
VDD
DRVP
0.1μF
1
2
3
4
5
6
C23
0.1μF
25V
10V
C2
WLX
PGND2
REF
FBN
WEN
DRVN
C11
0.1μF
50V
C10
0.1μF
25V
C1
4.7μF
10V
AAT2822
3
6
EN
BAT54SDW
A1
VIN
0.6V
R1
0
J1
FBP
0.3V
R21
0
COMP
6.04k
OPIN
4
5
1
2
OUT
17.4k
OP-
OP+
C24
10nF
U1
R12
R7
adj.
FB
R8
0.6V
AAT2822/23/24/25
AGND
18
17
16
15
14
13
R6
Adj
C9
8nF
C16
0.22μF
30V
C17
0.22μF
50V
200k
C26
10pF
LX
R11
R17
100 R16
0
R15
R14
10k
R13
10k
open
100pF
VDD
C8
PRODUCT DATASHEET
VIN
VGH (Positive)
2.2μH
L1
C22
0.1μF
D1
R18
open
R19
open
WFB
C3
10μF
10V
C6
22μF
25V
0.6V
www.DataSheet4U.com
R3
6.04k
open
R22
R2
VIN
VAVDD
Adj
open
R23
C25
open
HF-PWM
J7
VAVDD
VOPIN
1
2
21