參數(shù)資料
型號: LTC1642CGN#TRPBF
廠商: Linear Technology
文件頁數(shù): 11/16頁
文件大小: 243K
描述: IC CONTROLLER HOTSWAP ADJ 16SSOP
標(biāo)準(zhǔn)包裝: 2,500
類型: 熱交換控制器
應(yīng)用: 通用型 Infiniband?
內(nèi)部開關(guān):
電源電壓: 2.97 V ~ 16.5 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SSOP
包裝: 帶卷 (TR)
11
LTC1642
1642fb
APPLICATIO  S I FOR  ATIO
U
U
U
Automatic Restart After the Circuit Breaker Opens
The LTC1642 will automatically attempt to restart itself
after the circuit breaker opens if the FAULT output is tied
to the ON pin. The circuit is shown in Figure 5. Diode D1
blocks the weak FAULT pull-up current source from unbal-
ancing the R6-R5 divider.
During a continuous current limit such as a load short,
Q1s duty cycle is equal to the circuit breaker timer period,
divided by the sum of the circuit breaker and system timer
periods:
Short-Circuit Duty Cycle =
+
C
C
C
4
4   10   1
"
The duty cycle is 9% for the Figure 5 circuit. Waveforms
during a load short are shown in Figure 6.
Undervoltage Lockout
An internal undervoltage lockout circuit holds the charge
pump off until V
CC
 exceeds 2.73V. If V
CC
 falls below 2.5V,
it turns off the charge pump and clears overvoltage and
current limit faults.
For higher lockout thresholds tie the ON pin to a resistor
divider driven from V
CC
, as shown in Figure 7. This
circuit keeps the charge pump off until V
CC
  exceeds
(1+R6/R5) " 1.34V, and also turns it off if V
CC
 falls below
(1+R6/R5) " 1.22V.
D1
1N4148
D2
1N4705
18V
GATE
ON
14
SENSE
15
4
FAULT
6
BRK TMR
2
V
CC
16
R2
0.015&
Q1
FDS6630A
GND
LTC1642
8
RST TMR
3
R5
60.4k
1%
R6
464k
1%
R10
30k
1642 F05
R3
100&
R4
330&
C2
0.047礔
+
C1
0.33礔
C4
0.33礔
ALL RESISTORS ?% UNLESS NOTED
V
IN
12V
2.5A
V
OUT
C
LOAD
Figure 5. Automatic Restart Circuit
Figure 6. Automatic Retry Following a Load Short
V
GATE
20V/DIV
V
OUT
10V/DIV
V
BRKTMR
1V/DIV
V
RSTTMR
1V/DIV
40ms/DIV
1642 F06
D1
1N4705
18V
GATE
14
SENSE
15
ON
4
V
CC
16
R2
0.015&
Q1
FDS6630A
GND
LTC1642
8
RST TMR
3
R6
464k
1%
R5
60.4k
1%
V
IN
12V
2.5A
1642 F07
R3
100&
R4
330&
C2
0.047礔
+
C1
0.33礔
ALL RESISTORS ?% UNLESS NOTED
V
OUT
UNDERVOLTAGE
LOCKOUT
THRESHOLD = 10.7V
C
LOAD
Figure 7. Setting a Higher Undervoltage Lockout
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