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參數資料
型號: LTC4211IMS8
廠商: Linear Technology
文件頁數: 21/40頁
文件大小: 321K
描述: IC CONTROLLER HOT SWAP 8-MSOP
標準包裝: 50
類型: 熱交換控制器
應用: 通用
內部開關:
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)
供應商設備封裝: 8-MSOP
包裝: 管件
LTC4211
21
4211fb
OPERATION
GATE
TIMER
V
CC
1 2
3  4 5
6
GATE
V
FB
 < V
REF
>50mV
V
REF
10糀
4211 F10
t
RESET
t
FAULTSC
2糀
FPD
V
OUT
7  8
B
9
9A
1
FAST COMPARATOR ARMED
CIRCUIT BREAKER TRIPS
CIRCUIT BREAKER RESET
SLOW COMPARATOR ARMED
V
OUT
V
CC
  V
SENSE
FILTER
FAULT
RESET
ON
ON
ON
V
SENSE
 = 50mV
REGULATING
LOAD CURRENT
Figure 10. Power-Up in Overcurrent, Slow Comparator Trips the Circuit Breaker
ADJUSTING SLOW COMPS RESPONSE TIME
The response time of SLOW COMP is adjusted using a
capacitor connected from the LTC4211s FILTER pin to
ground. If this pin is left unused, SLOW COMPs delay
defaults to 20約. During normal operation, the FILTER
output pin is held low as an internal 10糀 pull-down
current source is connected to this pin by transistor M4.
This pull-down current source is turned off when an
overcurrent load condition is detected by SLOW COMP.
During an overcurrent condition, the internal 2糀 pull-
up current source is connected to the FILTER pin by
transistor M5, thereby charging C
FILTER
. As the charge
on the capacitor accumulates, the voltage across C
FILTER
 
increases. Once the FILTER pin voltage increases to 1.236V,
the electronic circuit breaker trips and the LTC4211s
GATE pin is switched quickly to ground by transistor M3.
After the circuit breaker is tripped, M5 is turned OFF, M4
is turned ON and the 10糀 pull-down current then holds
the FILTER pin voltage low.
The SLOW COMP response time from an overcurrent fault
condition to when the circuit breaker trips (GATE OFF) is
given by Equation 7:
 
SLOWCOMP
=1.236V"
C
FILTER
2礎
+20祍
 
(7)
For example, if C
FILTER
 = 1000pF, SLOW COMPs response
time = 638約. As a design aid, SLOW COMPs delay time
(t
SLOW COMP
) versus C
FILTER
 for standard values of C
FILTER
 
from 100pF to 1000pF is illustrated in Table 2.
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