參數(shù)資料
型號： LTC4211IMS8
廠商： Linear Technology
文件頁數(shù)： 22/40頁
文件大?。?/td> 321K
描述： IC CONTROLLER HOT SWAP 8-MSOP
標準包裝： 50
類型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開關(guān)： 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： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 8-MSOP
包裝： 管件
LTC4211
22
4211fb
OPERATION
SENSE RESISTOR CONSIDERATIONS
The fault current level at which the LTC4211s internal
electronic circuit breaker trips is determined by a sense
resistor connected between the LTC4211s V
CC
 and SENSE
pins and two separate trip points. The first trip point is
set by the SLOW COMPs threshold, V
CB(SLOW)
 = 50mV,
and occurs should a load current fault condition exist for
more than 20約. The current level at which the electronic
circuit breaker trips is given by Equation 8:
    
I
TRIP(SLOW)
=
V
CB(SLOW)
R
SENSE
=
50mV
R
SENSE
 
(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 300ns or longer. The current level
at which the circuit breaker trips in this case is given by
Equation 9:
 
TRIP(FAST)
=
V
CB(FAST)
R
EN E
=
150mV
R
EN E
 
(9)
As a design aid, the currents at which the electronic circuit
breaker trips for common values for R
SENSE
 are shown
in Table 3.
Figure 11. Making PCB Connections to the Sense Resistor
Table 2. t
SLOWCOMP
 vs C
FILTER
C
FILTER
t
SLOWCOMP
100pF
82約
220pF
156約
330pF
224約
470pF
310約
680pF
440約
820pF
527約
1000pF
638約
Table 3. I
TRIP(SLOW)
 and I
TRIP(FAST)
 vs R
SENSE
R
SENSE
I
TRIP(SLOW)
I
TRIP(FAST)
0.005?/DIV>
10A
30A
0.006?/DIV>
8.3A
25A
0.007?/DIV>
7.1A
21A
0.008?/DIV>
6.3A
19A
0.009?/DIV>
5.6A
17A
0.01?/DIV>
5A
15A
For proper circuit breaker operation, Kelvin-sense PCB
connections between the sense resistor and the LTC4211s
V
CC
  and SENSE pins are strongly recommended. The
drawing in Figure 11 illustrates the correct way of making
connections between the LTC4211 and the sense resis-
tor. PCB layout should be balanced and symmetrical to
minimize 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 accommodate
steady-state fault current levels so that the component is
not damaged before the circuit breaker trips. Table? in
the Appendix lists sense resistors that can be used with
the LTC4211s circuit breaker.
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
4211 F11
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:
 
TRIP(NOM)
=
V
CB(NOM)
R
EN E N  M
=
50mV
R
EN E N  M
 
(10)
The minimum load current that trips the circuit breaker is
given by Equation 11.
 
TRIP(MIN)
=
V
CB(MIN)
R
EN E MAX
=
40mV
R
EN E MAX
 
(11)
where
 
 
R
SENSE(MAX)
= R
SENSE(NOM)
1+
R
TOL
100
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