參數(shù)資料
型號(hào): ISL97650
廠商: Intersil Corporation
英文描述: 4-Channel Integrated LCD Supply
中文描述: 4通道集成LCD電源
文件頁(yè)數(shù): 15/20頁(yè)
文件大小: 333K
代理商: ISL97650
15
FN9198.3
November 28, 2006
In voltage doubler configuration, the maximum V
ON
is as
given by the following equation:
For Voltage Tripler:
V
ON
output voltage is determined by the following equation:
Negative Charge Pump Design Consideration
The negative charge pump consists of an internal switcher
M1, M2 which drives external steering diodes D2 and D3 via
a pump capacitor (C12) to generate the negative V
OFF
supply. An internal comparator (A1) senses the feedback
voltage on FBN and turns on M1 for a period up to half a
CLK period to maintain V
(FBN)
in regulated operation at
0.2V. External feedback resistor R6 is referenced to V
REF
.
Faults on V
OFF
which cause V
FBN
to rise to more than 0.4V,
are detected by comparator (A2) and cause the fault
detection system to start a fault ramp on C
DLY
pin which will
cause the chip to power down if present for more than the
time TFD (see "Electrical Specification" section and also
Figure “V
ON
FUNCTION DIAGRAM” on page 15).
FIGURE 16. V
ON
FUNCTION DIAGRAM
VSUP
VSUP
VSUP
C1-
POUT
FBP
Control
C1+
C2-
C2+
D3
D2
D1
M2
M4
M1
M3
M5
V
REF
1.2MHz
x2 Mode
x3 Mode
Both
External Connections
and Components
0.9V
C7
C8
C14
C21
R8
R9
C22
Error
FB
V
ON_MAX(2x)
2
V
SUP
V
DIODE
(
)
2
I
OUT
2
R
ONH
R
ONL
(EQ. 17)
+
(
)
=
V
ON_MAX(3x)
3
V
SUP
V
DIODE
(
)
2
I
OUT
3
R
ONH
2
R
ONL
+
(
)
=
(EQ. 18)
V
ON
V
FBP
1
R
8
R
9
------
+
=
(EQ. 19)
ISL97650
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