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参数资料
| 型号： | LT1640LCS8#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 16/16页 |
| 文件大小： | 187K |
| 代理商： | LT1640LCS8#TRPBF |
9
LT1640L/LT1640H
1640lhfb
APPLICATIONS INFORMATION
WU
U
VEE
VDD
LT1640L
PWRGD
SENSE
C1
150nF
25V
CL
100
F
100V
Q1
IRF530
R2
10
5%
R3
18k
5%
C2
3.3nF
100V
R4
562k
1%
R5
9.09k
1%
R6
10k
1%
R1
0.02
5%
4
3
2
OV = 71V
GND
– 48V
UV = 37V
OV
UV
5
C3
6
8
1
GATE
DRAIN
1640 F08
+
7
1N4148
GND
(SHORT PIN)
*
* DIODES INC. SMAT70A
R7
4
3
2
1
Figure 8. Extending the Short-Circuit Protection Delay
Figure 7. Start-Up Into a Short Circuit
1640 F07
Electronic Circuit Breaker
The LT1640 features an electronic circuit breaker function
that protects against short circuits or excessive supply
currents. By placing a sense resistor between the VEE and
SENSE pin, the circuit breaker will be tripped whenever the
voltage across the sense resistor is greater than 50mV for
more than 3
s as shown in Figure 7.
Note that the circuit breaker threshold should be set
sufficiently high to account for the sum of the load current
and the inrush current. If the load current can be controlled
by the PWRGD/PWRGD pin (as in Figure 6a), the threshold
can be set lower, since it will never need to accommodate
inrush current and load current simultaneously.
When the circuit breaker trips, the GATE pin is immediately
pulled to VEE and the external N-channel turns off. The
GATE pin will remain low until the circuit breaker is reset
by pulling UV low, then high or cycling power to the part.
If more than 3
s deglitching time is needed to reject
current noise, an external resistor and capacitor can be
added to the sense circuit as shown in Figure 8. R7 and C3
act as a lowpass filter that will slow down the SENSE pin
voltage from rising too fast. Since the SENSE pin will
source current, typically 20
A, there will be a voltage drop
on R7. This voltage will be counted into the circuit breaker
trip voltage just as the voltage across the sense resistor.
A small resistor is recommended for R7. A 100
for R7
will cause a 2mV error. The following equation can be used
to estimate the delay time at the SENSE pin:
tR C In
Vt
VV t
O
iO
=
–
–
() – ( )
–( )
1
Where V(t) is the circuit breaker trip voltage, typically
50mV. V(tO) is the voltage drop across the sense resistor
before the short or over current condition occurs. Vi is the
voltage across the sense resistor when the short current
or over current is applied on it.
Example: A system has a 1A current load and a 0.02
sense resistor is used. An extended delay circuit needs to
be designed for a 50
s delay time after the load jumps to
5A. In this case:
V(t) = 50mV
V(tO) = 20mV
Vi = 5A 0.02 = 100mV
If R7 = 100
, then C3 = 1F.
INRUSH
CURRENT
2A/DIV
GATE – VEE
4V/DIV
VEE
50V/DIV
4ms/DIV
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