at1731a Aimtron Technology, at1731a Datasheet - Page 19

• Manufacturer Part Number: at1731a
• Description: Dc-dc Power Ic For Tft Panel
• Manufacturer: Aimtron Technology

Negative Charge Pump Design Consideration
For a single stage charge pump, the maximum V
where:
R
Positive Charge Pump Design consideration
For two stage charge pumps, the maximum V
equation:
where:
R
V
V
−
I
V
Vmain
POS
SWNN(ON)
POS
SWPP(ON)
NEG
NEG
I
NEG
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone]
2/8/2006 REV:1.1
C
(
equation:
×
(
MAX
NEG
MAX
0
×
5 .
)
Cout
)
0
≤
×
V
REF
and R
≥
5 .
and R
2
f
×
OSC
I
×
1
NEG
V
R10
R11
C
1.23V
f
DDP
×
OSC
CPN
SWPN(ON)
SWNP(ON)
C
1
×
−
POS
2
×
I
Negative and Positive charge pump function diagram
×
C
POS
V
SWN
FBN
+
(
NEG
DDN
R
×
V
2
SWNn
DDP
resistance values depend on the V
resistance values depend on the V
×
−
(
Fax: [phone]
V
R
−
(
ON
SWPN
DDN
2 (
)
×
Driver
+
(
V
ON
R
DIODE
)
SWNP
+
R
Switch
Block
+
(
SWPP
ON
I
POS
)
)
(
ON
+
Driver
×
)
2
)
DL
0
19
NEG
−
×
5 .
POS
1.23V
2
V
×
C
×
DIODE
DL
f
output is determined by the following
V
OSC
output is determined by the following
DIODE
1
DC-DC Power IC for TFT Panel
Preliminary Product Information
×
−
C
FBP
DDP
V
SWP
I
DDN
−
WWW:
CPP
DDP
NEG
I
Email:
POS
VDDP
voltage levels.
+
voltage levels.
×
C
I
×
CPP
POS
0
http://www.aimtron.com.tw
0
R4
R3
5 .
[e-mail]
C
5 .
×
CPP
×
×
0
f
f
5 .
OSC
OSC
×
1
1
f
×
×
OSC
C
C
C
1
AT1731A
OUT
CPP
CPN
×
C
Vpos triple
output
−
OUT
Vpos triple
output
C
POS
VDDP
)