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參數(shù)資料
| 型號： | LTC1642I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 8-Bit, 40 MSPS ADC Single Ch., Internal S&H, Low Power 24-TSSOP 0 to 70 |
| 中文描述： | 熱插拔控制器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 147K |
| 代理商： | LTC1642I |
7
LTC 1642
APPLICATIO S U
U
Automatic Restart After a Current Fault
W
U
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, and the
waveforms during a load short in Figure 6.
During a continuous current limit such as a load short, the
N-channel pass transistor’s duty cycle is equal to the
circuit breaker timer period, divided by the sum of the
circuit breaker and system timer periods. If FAULT is tied
to ON then open drain logic should be used to drive the
node. The external pull-up resistor at the ON pin may be
omitted because FAULT provides a weak pull-up.
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+R1/R5)1.34V, and also turns it off if V
CC
falls below
(1+R1/R5)1.23V.
GATE
14
SENSE
15
ON
4
V
CC
16
R2
0.010
Q1
FDR9410A
GND
LTC1642
8
RST TMR
3
R1
464k
1%
R5
60.4k
1%
V
IN
12V
2.5A
1642 F07
R3
100
R4
330
C2
0.047
μ
F
+
C7
0.1
μ
F
C1
0.33
μ
F
ALL RESISTORS
±
5% UNLESS NOTED
Figure 7. Setting a Higher Undervoltage Lockout
V
OUT
UNDERVOLTAGE
LOCKOUT
THRESHOLD = 10.7V
C
LOAD
6
5
4
3
2
1
BRK TMR
1.23V
1.23V
1642 F06
GATE
V
OUT
RST TMR
ON/FAULT
GATE
ON
14
SENSE
15
CRWBR
1
4
FAULT
6
OV
BRK TMR
2
9
V
CC
16
R2
0.010
Q1
FDR9410A
GND
LTC1642
8
RST TMR
3
R5
1642 F05
R3
100
R4
330
C2
0.047
μ
F
+
C7
0.1
μ
F
C1
0.33
μ
F
C4
0.33
μ
F
ALL RESISTORS
±
5% UNLESS NOTED
Q2
2N2222
Q3
MCR
12DC
C5
V
IN
12V
2.5A
V
OUT
R1
C4
C4 + 10 C1
SHORT-CIRCUIT DUTY CYCLE =
= 9%
C
LOAD
Figure 5. Automatic Restart Circuit
Figure 6. Automatic Retry Following a Load Short
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