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LTC1155CN8 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC1155CN8
Description  Dual High Side Micropower MOSFET Driver
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1155CN8 Datasheet(HTML) 9 Page - Linear Technology

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9
LTC1155
Dual 2A Autoreset Electronic Fuse
S
APPLICATI
TYPICAL
S
APPLICATI
I FOR ATIO
Overvoltage Protection
The MOSFET and load can be protected against overvolt-
age conditions by using the circuit of Figure 6. The drain
sense function is used to detect an overvoltage condition
and quickly discharge the power MOSFET gate. The 18V
zener diode conducts when the supply voltage exceeds
Figure 5. Reverse Battery Protection
1155 F05
LOAD
LTC1155
GND
GND
G1
DS1
VS
IN1
VS = 4.5V TO 18V
CDLY
RSEN
RDLY
100k
5V
300
Ω
1/4W
10
µF
25V
+
18.6V and pulls the drain sense pin 0.6V below the supply
pin voltage.
The supply voltage is limited to 18.6V and the gate drive is
immediately removed from the MOSFET to ensure that it
cannot conduct during the overvoltage period. The gate of
the MOSFET will be latched OFF until the supply transient
is removed and the input turned OFF and ON again.
Figure 6. Overvoltage Shutdown and Protection
1155 F06
LOAD
LTC1155
GND
GND
G1
DS1
VS
IN1
VS = 4.5V TO 18V
510
Ω
10k
1N4148
18V
1155 TA03
0.03
Ω
10
µF
1/2 SI9956DY
30k
LTC1155
GND
IN1
IN2
DS2
VS
DS1
0.03
Ω
G2
G1
0.1
µF
30k
0.1
µF
5V
100k
1/2 SI9956DY
1N4148
1N4148
OUT 1
OUT 2
100k
750k
1.0
µF
LMC555
6
1
2
3
84
fO = 1Hz
ALL COMPONENTS SHOWN ARE SURFACE MOUNT
+


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