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參數(shù)資料
| 型號： | MIC2017 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 熱切換/電源分布 |
| 英文描述： | Adjustable Current Limit Power Distribution Switch |
| 中文描述： | 可調(diào)的限流配電開關(guān) |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 748K |
| 代理商： | MIC2017 |
Micrel
MIC2007/MIC2017
October 2005
15
M9999-102805
0
0.002
0.004
0.006
0.008
0.01
0.012
0.014
0 0 0 0 0 0 0 0 0 0
TIME
(mS)
CSLEW (nF)
Typical Turn-on Times
vs. External C
SLEW
Capacitance
2
4
6
8
10
12
14
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
T
RISE
T
DELAY
T
ON
Figure 8.
CSLEW’s effect on ILIMIT
An unavoidable consequence of adding CSLEW
capacitance is a reduction in the MIC2008/2018’s ability
to quickly limit current transients or surges. A
sufficiently large capacitance can prevent both the
primary and secondary current limits from acting in time
to prevent damage to the MIC2008/2018 or the system
from a short circuit fault. For this reason, the upper limit
on the value of CSLEW is 4nF.
Kickstart (MIC2017)
Kickstart allows brief current surges to pass to the load
before the onset of normal current limiting. This, in turn,
permits dynamic loads to draw bursts of energy without
sacrificing system safety.
Functionally, Kickstart is a forced override of the normal
current limiting function provided by the MIC2017. The
Kickstart period is governed by an internal timer which
allows current to pass unimpeded to the load for 128ms
and then normal (primary) current limiting goes into
action.
During Kickstart a secondary current limiting circuit is
monitoring output current to prevent damage to the
MIC2017. This is because a hard short, combined with
a robust power supply, can result in currents of many
tens of amperes. This secondary current limit is
nominally set at 4 Amps and reacts immediately and
independently of the Kickstart period. Once the Kickstart
timer has finished its count, the primary current limiting
circuit takes over and holds IOUT to its programmed limit
for as long as the excessive load persists.
Once the MIC2017 drops out of current limiting the
Kickstart timer initiates a lock-out period of 128ms such
that no further bursts of current above the primary
current limit, will be allowed until the lock-out period has
expired.
Kickstart may be over-ridden by the thermal protection
circuit and if sufficient internal heating occurs, Kickstart
will be terminated and IOUT
0. Upon cooling, if the
load is still present IOUT
ILIMIT, not IKICKSTART.
FAULT/
ENABLE
VOUT
IOUT
0
Time (ms)
100
200
300
400
500
600
Kickstart
Current Limiting
Load Removed
Figure 9. Kickstart Operation with Varying Load
Supply Filtering
A 0.1F to 1F bypass capacitor positioned close to the
VIN and GND pins of MIC2007/2017 is both good design
practice and required for proper operation of the
MIC2007/2017. This will control supply transients and
ringing. Without a bypass capacitor, large current surges
or an output short may cause sufficient ringing on VIN
(from supply lead inductance) to cause erratic operation
of the MIC2007/2017’s control circuitry. Good quality,
low ESR capacitors, such as Panasonic’s TE or ECJ
series, are suggested.
When bypassing with capacitors of 10F and up, it is
good practice to place a smaller value capacitor in
parallel with the larger to handle the high frequency
components of any line transients. Values in the range
of 0.01F to 0.1F are recommended. Again, good
quality, low ESR capacitors should be chosen.
Power Dissipation
Power dissipation depends on several factors such as
the load, PCB layout, ambient temperature, and supply
voltage. Calculation of power dissipation can be
accomplished by the following equation:
(
)2
OUT
DS(ON)
D
I
R
P
×
=
To relate this to junction temperature, the following
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