參數(shù)資料
型號(hào): LTC4210-2CS6#TRM
廠商: Linear Technology
文件頁(yè)數(shù): 13/20頁(yè)
文件大?。?/td> 251K
描述: IC CONTROLLER HOT SWAP TSOT23-6
標(biāo)準(zhǔn)包裝: 1
類型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開(kāi)關(guān): 無(wú)
電源電壓: 2.7 V ~ 16.5 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: SOT-23-6 細(xì)型,TSOT-23-6
供應(yīng)商設(shè)備封裝: SOT-23-6
包裝: 剪切帶 (CT)
產(chǎn)品目錄頁(yè)面: 1342 (CN2011-ZH PDF)
其它名稱: LTC4210-2CS6
LTC4210-2CS6#TRMCT
LTC4210-2CS6-ND
13
LTC4210-1/LTC4210-2
 421012f
Circuit Breaker Timer Operation
When a current limit fault is encountered at time point A in
Figure 5, the circuit breaker timing is activated with a 60礎(chǔ)
pull-up. The circuit breaker trips at time point B if the fault
is still present and the TIMER pin voltage reaches the
COMP2 threshold and the LTC4210 shuts down. For a
continuous fault, the circuit breaker delay is:
t
V
C
A
CBDELAY
TIMER
=
?/DIV>
1 3
60
.    "
(13)
Intermittent overloads may exceed the current limit as in
Figure 6, but if the duration is sufficiently short, the TIMER
pin may not reach the COMP2 threshold and the LTC4210
will not shut down. To handle this situation, the TIMER
discharges with 2礎(chǔ) whenever (V
CC
  SENSE) voltage is
below the 50mV limit and the TIMER voltage is between
the COMP1 and COMP2 thresholds. When the TIMER
voltage falls below the COMP1 threshold, the TIMER pin is
discharged with an equivalent 7k resistor (normal mode,
100礎(chǔ) source) when (V
CC
  SENSE) voltage is below the
50mV limit. If the TIMER pin does not drop below the
COMP1 threshold, any intermittent overload with an ag-
gregate duty cycle of more than 3.8% will eventually trip
the circuit breaker. Figure 7 shows the circuit breaker
response time in seconds normalized to 1礔. The asym-
metric charging and discharging of TIMER is a fair gauge
of MOSFET heating.
t
C
s    F
V
F
A  D
A
TIMER
(  /    )
.    "
"    
?nbsp  =
?/DIV>
?/DIV>
(
)
?/DIV>
1 3   1
60
2
(14)
When the circuit breaker trips, the GATE pin is pulled low.
The TIMER enters latchoff mode with a 5礎(chǔ) pull-up for the
LTC4210-2 (latched-off version), while an autoretry cool-
off cycle begins with a 2礎(chǔ) pull-down for the LTC4210-1
(autoretry version). An autoretry cool-off delay of the
LTC4210-1 between COMP2 and COMP1 thresholds takes:
t
V
C
A
COOLOFF
TIMER
=
?/DIV>
1 1
2
.   "
(15)
APPLICATIO S I FOR ATIO
U
U
U
V
TIMER
NORMAL
MODE
FAULT
MODE
100礎(chǔ)
COMP1
CIRCUIT BREAKER
TRIPS
LATCHED OFF (5礎(chǔ) PULL-UP)
OR RETRY (2礎(chǔ) PULL-DOWN)
COMP2
A
B
60礎(chǔ)
4210 F05
Figure 5. A Continuous Fault Timing
OVERLOAD DUTY CYCLE, D (%)
10
30
1
4210 F07
0.01
0.1
20
100
90
80
70
60
50
40
0
(s/礔) =
t
C
TIMER
1.3V " 1礔
60礎(chǔ) " D  2礎(chǔ)
Figure 7. Circuit Breaker Timer Response
for Intermittent Overload
A1
B1    A2
B2    A3  B3
~50mV/R
SENSE
60礎(chǔ)
CIRCUIT BREAKER
TRIPS
COMP1
4210 F06
COMP2
I
LOAD
V
TIMER
V
GATE
2礎(chǔ)
CB
FAULT
CB
FAULT
CB
FAULT
2礎(chǔ)
LATCHED OFF (5礎(chǔ) PULL-UP)
OR RETRY (2礎(chǔ) PULL-DOWN)
60礎(chǔ)
60礎(chǔ)
10礎(chǔ)
10礎(chǔ)
Figure 6. Mulitple Intermittent Overcurrent Conditon
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