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參數資料
型號： LTC4212IMS#TRPBF
廠商： Linear Technology
文件頁數： 20/24頁
文件大小： 234K
描述： IC CTRLR HOTSWAP TIMEOUT 10MSOP
標準包裝： 2,500
類型： 熱交換控制器
應用： 通用
內部開關： 無
電源電壓： 2.5 V ~ 16.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應商設備封裝： 10-MSOP
包裝： 帶卷 (TR)
20
LTC4212
4212f
OPERATIO
by the SLOW COMPs threshold, V
CB(SLOW)
 = 50mV, and
occurs should a load current fault condition exist for more
than 18祍. The current level at which the electronic circuit
breaker trips is given by Equation 8:
I
V
R
mV
R
TRIP SLOW
CB SLOW
SENSE
SENSE
(
)
(
)
=
=
50
(8)
The second trip point is set by the FAST COMPs threshold,
V
CB(FAST)
 = 150mV, and occurs during fast load current
transients that exist for 500ns or longer. The current level
at which the circuit breaker trips in this case is given by
Equation 9:
I
V
R
mV
R
TRIP FAST
CB FAST
SENSE
SENSE
(
)
(
)
=
=
150
(9)
As a design aid, the currents at which electronic circuit
breaker trips for common values for R
SENSE
 are shown in
Table 4.
Table 4. I
TRIP(SLOW)
 and I
TRIP(FAST)
 vs R
SENSE
R
SENSE
I
TRIP(SLOW)
I
TRIP(FAST)
0.005&
10A
30A
0.006&
8.3A
25A
0.007&
7.1A
21A
0.008&
6.3A
19A
0.009&
5.6A
17A
0.01&
5A
15A
For proper circuit breaker operation, Kelvin-sense PCB
connections between the sense resistor and the LTC4212s
V
CC
  and SENSE pins are strongly recommended. The
drawing in Figure 7 illustrates the correct way of making
connections between the LTC4212 and the sense resistor.
PCB layout should be balanced and symmetrical to mini-
mize wiring errors. In addition, the PCB layout for the
sense resistor should include good thermal management
techniques for optimal sense resistor power dissipation.
The power rating of the sense resistor should accommo-
date steady-state fault current levels so that the compo-
nent is not damaged before the circuit breaker trips.
Table 5 in the Appendix lists sense resistors that can be
used with the LTC4212s circuit breaker.
Calculating Circuit Breaker Trip Current
For a selected R
SENSE
 value, the nominal load current that
trips the circuit breaker is given by Equation 10:
IRC-TT SENSE RESISTOR
LR251201R010F
OR EQUIVALENT
0.01&, 1%, 1W
CURRENT FLOW
TO LOAD
CURRENT FLOW
TO LOAD
TO
V
CC
TO
SENSE
TRACK WIDTH W:
0.03" PER AMP
ON 1 OZ COPPER
W
4212 F07
Figure 7. Making PCB Connections to the Sense Resistor
I
V
R
mV
R
TRIP NOM
CB NOM
SENSE NOM
SENSE NOM
(
)
(
)
(
)
(
)
=
=
50
(10)
The minimum load current that trips the circuit breaker is
given by Equation 11.
I
V
R
mV
R
TRIP MIN
CB MIN
SENSE MAX
SENSE MAX
(    )
(    )
(    )
(    )
=
=
40
(11)
where
R
R
R
SENSE MAX
SENSE NOM
TOL
(    )
(
)
"
=
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
100
The maximum load current that trips the circuit breaker is
given in Equation 12.
I
V
R
mV
R
TRIP MAX
CB MAX
SENSE MIN
SENSE MIN
(    )
(    )
(    )
(    )
=
=
60
(12)
where
R
R
R
SENSE MIN
SENSE NOM
TOL
(    )
(
)
"   
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
100
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