NCP431A, SC431A, NCP431B, NCP432B Series

http://onsemi.com

10

R2

R1

V+

R1

R2

Figure 28. Triac Crowbar

R1

R2

V+

R2

R1

Figure 29. SRC Crowbar

Figure 30. Voltage Monitoring

V+

I

R2

R1

R4

R3

Lower Limit + 1 )

R1

R2

Upper Limit + 1 )

R3

R4

L.E.D. indicator is ‘on’ when V+ is between the uppper

and lower limits.

V+

[2.0 V

Figure 31. Single−Supply Comparator with

Temperature−Compensated Threshold

V+

R1

4.7 k

Vin = 10 to 20 V

4.7k

MPSA20

1.0k

4.7k

2.2k

0.1 mF

2200 mF

10

1N5823

100k

51k

0.01 mF

150 mH @ 2.0 A

470 mF

TIP115

Figure 32. Step−Down Switching Converter