Datasheet

13
LTC1255
TYPICAL APPLICATIO S
U
18V to 32V Operation with Overcurrent Shutdown and Optional
Overvoltage Shutdown
Bootstrapped Gate Driver (100Hz < f
O
< 10kHz) High-Side Switch with Thermal Shutdown (PTC Thermistor)
V
S
DS1
1/2 LTC1255

GND

IN1


G1
+
10µF
*KEYSTONE RL2006-100-100-30-PT
LOAD
IRF530
FROM
µP, ETC.
9V TO 24V
LTC1255 • TA10
PTC*
THERMISTOR
(100°C)
12V
1N5242B
100k
V
S
DS1
1/2 LTC1255
G1
GND

IN1



+
10k
2N3904
1k
2N3906
36V*
1N5258B
R
SEN

0.10Ω
1W
(I
MAX
= V
BE
/R
SEN
)
10k
12V
1N5242B
IRF530
FROM
µP, ETC.
24V
1N5252B
1µF
50V
18V TO 32V
LOAD
1k
18V TO 32V
*OPTIONAL 36V OVERVOLTAGE SHUTDOWN
LTC1255 • TA08
V
S
DS1
1/2 LTC1255

GND

IN1


G1
+
10µF
2N2222
12V
1N5242B
*V
GS
= V
S
– 0.6V
(CLAMPED AT 12V)
RISE AND FALL TIMES
ARE BETA TIMES FASTER
*
1N4148
LOAD
2N3906
IRFZ44
0.1µF
FROM
µP, ETC.
9V TO 24V
0.036Ω
LTC1255 • TA09