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NCP431A

Programmable Precision References

ON Semiconductor 

NCP431A, SC431A, NCP431B, NCP432B Series

V+

VOUT

V+

VOUT

R1

R1

R2

R2

ǒ ǓR1

VOUT(trip) +

1)

R2

Vref

Figure 27. Triac Crowbar

ǒ ǓR1

VOUT(trip) +

1)

R2

Vref

Figure 28. SRC Crowbar

V+

I

VOUT

R1

R3

VIN

V+

R1

VOUT

VIN

< Vref

> Vref

VOUT

V+

[2.0 V

R2

R4

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

and lower limits.

ǒ Ǔ Lower Limit +

1 ) R1

R2

Vref

ǒ ǓR3

Upper Limit +

1)

R4

Vref

Figure 29. Voltage Monitoring

Vin = 10 to 20 V

TIP115

1.0k

4.7 k

2200 mF

MPSA20

4.7k

Vth + Vref

Figure 30. Single−Supply Comparator with

Temperature−Compensated Threshold

150 mH @ 2.0 A

1N5823

4.7k

100k

0.01 mF

VOUT = 5.0 V

IOUT = 1.0 A

470 mF

0.1 mF

2.2k

10

51k

Figure 31. Step−Down Switching Converter

http://onsemi.com

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