參數(shù)資料
型號(hào): FDC6324
廠商: Fairchild Semiconductor Corporation
英文描述: Integrated Load Switch
中文描述: 綜合負(fù)荷開關(guān)
文件頁(yè)數(shù): 6/10頁(yè)
文件大?。?/td> 259K
代理商: FDC6324
FDC6324L Load Switch Application
General Description
This device is particularly suited for computer
peripheral switching applications where 20V
input and 1A output current capability are
needed. This load switch integrates a small
N-Channel Power MOSFET (Q1) which drives a
large P-Channel Power MOSFET (Q2) in one
tiny SuperSOT
TM
-6 package.
A load switch is usually configured for high side
switching so that the load can be isolated from
the active power source. A P-Channel Power
MOSFET, because it does not require its drive
voltage above the input voltage, is usually more
cost effective than using an N-Channel device in
this particular application. A large P-Channel
Power MOSFET minimizes voltage drop. By
using a small N-Channel device the driving
stage is simplified.
Component Values
R1
R2
C1
Typical 10k - 1M
Typical 0 - 10k
(optional)
Typical 1000pF
(optional)
Design Notes
R1 is needed to turn off Q2.
R2 can be used to soft start the switch in the case the output capacitance Co is small.
R2
should be at least 10 times smaller than R1 to guarantee Q1 turns on.
By using R1 and R2 a certain amount of current is lost from the input. This bias current loss is given by
the equation
when the switch is ON. I
BIAS_LOSS
can be minimized by large R1.
R
1
+
R
2
I
BIAS
_
LOSS
=
Vin
R2 and C
of Q2 make ramp for slow turn on. If excessive overshoot current occurs due to fast turn on,
additional capacitance C1 can be added externally to slow down the turn on.
FDC6324L Rev. D
APPLICATION CIRCUIT
IN
OUT
ON/OFF
R1
R2
C1
LOAD
Co
Q2
Q1
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