LT1158

19

Control Logic for Locked Anti-Phase Drive

Motor stops if either side is shorted to ground

Control Logic for Sign/Magnitude Drive

+

1

µF

1N4148

PWM

DIRECTION

STOP

(FREE RUN)

ENABLE A

INPUT A

FAULT A

ENABLE B

INPUT B

FAULT B

74HC02

1158F17b

0.1

µF

1N4148

PWM

5V

ENABLE A

INPUT A

FAULT A

ENABLE B

INPUT B

FAULT B

74HC132

1158F17c

5.1k

0.01

µF

150k

Figure 17. 10A Full Bridge Motor Control

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LT1158 F17a

+

0.01

µF

LOW

ESR

15

Ω

SIDE B: SHOWS

CURRENT-SENSING

MOSFET CONNECTION

10V TO 30V

0.1

µF

Q1, Q3: IRF540 (STANDARD)

IRC540 (SENSE FET)

Q2, Q4: IRFZ44

D1, D2: BAT83

ULTRONIX RCS01

1N4148

+

+

–

Q2

0.01

µF

15

Ω

15

Ω

10

µF

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

BOOST

T GATE DR

T GATE FB

T SOURCE

B GATE DR

BOOST DR

BIAS

ENABLE

FAULT

INPUT

GND

B GATE FB

LT1158

1N4148

–

Q1

Q4

0.015

Ω

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

BOOST

T GATE DR

T GATE FB

T SOURCE

B GATE DR

BOOST DR

BIAS

ENABLE

FAULT

INPUT

GND

B GATE FB

LT1158

Q3

+

ENABLE A

INPUT A

FAULT A

ENABLE B

INPUT B

FAULT B

10

µF

470

µF

LOW

ESR

470

µF

15

Ω

2.4k

2.4k

0.1

µF

+

D1

47

Ω

D2

SIDE A: SHOWS

STANDARD MOSFET

CONNECTION

+

Μ