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參數(shù)資料
| 型號： | EL7642 |
| 廠商： | Intersil Corporation |
| 英文描述： | TFT-LCD DC/DC with Integrated Amplifiers |
| 中文描述： | 的TFT - LCD的DC / DC集成放大器 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 493K |
| 代理商： | EL7642 |
16
FN7415.1
September 26, 2005
FIGURE 23. START-UP SEQUENCE
Component Selection for Start-up Sequencing and
Fault Protection
The C
REF
capacitor is typically set at 220nF and is required
to stabilize the V
REF
output. The range of C
REF
is from
22nF to 1μF and should not be more than five times the
capacitor on C
DEL
to ensure correct start-up operation.
The C
DEL
capacitor is typically 220nF and has a usable
range from 47nF minimum to several microfarads – only
limited by the leakage in the capacitor reaching μA levels.
C
DEL
should be at least 1/5 of the value of C
REF
(see
above). Note with 220nF on C
DEL
the fault time-out will be
typically 50ms and the use of a larger/smaller value will vary
this time proportionally (e.g. 1μF will give a fault time-out
period of typically 230ms).
V
CDLY
IN
V
REF
V
BOOST
V
OFF
V
ON
V
R
V
B
S
V
O
V
O
S
F
C
N
O
F
P
START-UP SEQUENCE
TIMED BY C
DLY
t
ON
t
DEL1
t
DEL2
EL7640, EL7641, EL7642
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