參數(shù)資料
型號: LTC1421ISW-2.5#PBF
廠商: Linear Technology
文件頁數(shù): 10/24頁
文件大?。?/td> 329K
描述: IC CONTROLLER HOT SWAP 24-SOIC
標(biāo)準(zhǔn)包裝: 32
類型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開關(guān):
電源電壓: 3 V ~ 12 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC
包裝: 管件
10
LTC1421/LTC1421-2.5
APPLICATIONS INFORMATION
U
U
U
A 5.1k resistor is tied from the FB pin to V
OUTLO
, setting the
internal threshold to about 2.9V. The new reset threshold
voltage is set by the external resistive divider connected to
COMP2. When V
OUTLO
 drops below the new threshold,
COMPOUT pulls FB to ground, changing the internal
threshold at COMP1 to 5.88V and generating a reset.
Finally, the comparator may be used to monitor a negative
supply as shown in Figure 8e. The external resistor divider
Figure 8c shows how the comparator can be used to
generate a reset when the 12V supply (V
OUTHI
) drops
below 10.8V. The 5V supply (V
OUTLO
) also generates a
reset when it dips below 4.65V. When the 12V supply
drops below 10.8V, COMPOUT will pull the FB pin low
setting the internal threshold voltage for comparator 1 to
5.88V. Since V
OUTLO
 is less than 5.88V, PWRGD immedi-
ately goes low and a reset is generated 32祍 later.
Figure 8d shows how the comparator can be used to
override the internal reset voltage for a 5V supply on
V
OUTLO
.

+

+
V
CCLO
V
CCLO
1421 F08c
1.232V
LTC1421
20礎(chǔ)
20礎(chǔ)
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
107k
1%
13.7k
1%
6
7
71.5k
5V
12V
Figure 8c. Reset 12V at 10.8V, Reset 5V at 4.65V
Figure 8e. Monitor 12V at 10.8V, Reset 5V at 4.65V

+

+
V
CCLO
V
CCLO
1421 F08e
1.232V
LTC1421
20礎(chǔ)
20礎(chǔ)
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
107k
1%
10k
5%
13.7k
1%
6
7
71.5k
5V
12V
12V
Figure 8d. Reset 5V at 4.5V

+

+
V
CCLO
V
CCLO
1421 F08d
1.232V
LTC1421
20礎(chǔ)
20礎(chǔ)
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
102k
1%
5.1k
5%
38.3k
1%
6
7
71.5k
5V
12V

+

+
V
CCLO
V
CCLO
1421 F08b
1.232V
LTC1421
20礎(chǔ)
20礎(chǔ)
8
14
13
15
11
16
20
26.7k
COMP1
COMP2
RESET
TIMING
73.5k
10k
5%
107k
1%
38.3k
1%
6
7
71.5k
3.3V
5V
Figure 8b. Monitor 5V, Reset 3.3V at 2.9V
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