LT1158CS View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1158CS' PDF : 20 Pages View PDF
LT1158
TYPICAL APPLICATIONS
0.01µF
4.7k
1
*3.4k 0.1µF 2
EXT 3
30k
SYNC
4
f = 25kHz 2.2nF
5
0.01µF
6
27k
7
1µF
510Ω
8
4.7k
LT3525
SHUTDOWN
1µF
16
15
14 10µF
13
1N4148
12
1N4148
11
10
*
9
10k
330pF
1N4148
1 BOOST DR
16
BOOST
2 V+
0.01µF
3 BIAS
15
T GATE DR
14
T GATE FB
4
ENABLE
5
FAULT
13
T SOURCE
LT1158 SENSE+ 12
6 INPUT
SENSE– 11
7
GND
V+ 10
8 B GATE FB
9
B GATE DR
INPUT
30V MAX
IRFZ44
0.1µF
330k
500µF EA
LOW ESR
SHORT-CIRCUIT
CURRENT = 15A
L1
70µH
RS
0.007Ω
+
–
(2) IRFZ44
MBR340
5V OR
12V*
1000µF
LOW ESR
* ADD THESE COMPONENTS TO IMPLEMENT
LOW-DROPOUT 12V REGULATOR
L1: MAGNETICS CORE #55585-A2 RS: DALE TYPE LVR-3
30 TURNS 14GA MAGNET WIRE
ULTRONIX RCS01
LT1158 F13
Figure 13. 90% Efficiency 24V to 5V 10A Switching Regulator
95% Efficiency 24V to 12V 10A Low Dropout Switching Regulator
MOTOR SPEED
0 TO 100%
10k
1µF
7.5k
5.1k
1N5231A
10µF
1
2
13k 3
4
CMOS
555
8
7
6
5 2.2nF
THE CMOS 555 IS USED AS A 25kHz TRIANGLE-WAVE
OSCILLATOR DRIVING THE LT1158 INPUT PIN. THE
D.C. LEVEL OF THE TRIANGLE WAVE IS SET BY THE
POTENTIOMETER ON THE CMOS 555 SUPPLY PIN, AND
ALLOW ADJUSTMENT OF THE LT1158 DUTY CYCLE
FROM 0 TO 100%.
0.33µF
510Ω
1N4148
1
BOOST DR
2 V+
0.01µF
3 BIAS
16
BOOST
15 24Ω
T GATE DR
14
T GATE FB
4
ENABLE
13
T SOURCE
1k 5 FAULT LT1158 SENSE+ 12
6
INPUT
SENSE– 11
7 GND
8
B GATE FB
V+ 10
9
24Ω
B GATE DR
10V TO 30V
0.1µF
1000µF
LOW ESR
Q1
+
START CURRENT
= 15A MINIMUM
0.02Ω
–
Q2
Μ
CMOS 555: LMC555 OR TLC555
Q1, Q2: MTP35N06E
LT1158 F14
Figure 14. Potentiometer-Adjusted Open Loop Motor Speed Control with Short-Circuit Protection
17
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