NCP431B datasheet(4/17 Pages) ONSEMI

Part #	NCP431B

Description	Programmable Precision References

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NCP431A, SC431A, NCP431B, NCP432B Series

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ELECTRICAL CHARACTERISTICS (TA = 25°C, unless otherwise noted.)

Symbol

Characteristic

NCP431BC

NCP432BC

NCP431BI

NCP432BI

NCP431BV

NCP432BV

Unit

Min

Typ

Max

Min

Typ

Max

Min

Typ

Max

Vref

Reference Input Voltage

VKA = Vref, IK = 1 mA

TA = 25°C

TA = Tlow to Thigh (Note 6)

2.4875

2.500

2.5125

2.4875

2.4775

2.500

2.5125

2.4875

2.4725

2.500

2.5125

V

DVrefT

Reference Input Voltage Deviation Over Tem-

perature Range (Figure 1, Notes 7, 8)

VKA= Vref, IK = 1 mA

−

5.0

10

1−

−

10

15

mV

DVref

DVAK

Ratio of Change in Reference Input Voltage to

Change in Cathode to Anode Voltage

IK = 1 mA (Figure 2),

DVKA = 10 V to Vref

DVKA = 36 V to 10 V

−

−2.00

−1.28

−3.1

−1.9

−

−2.00

−1.28

−3.1

−1.9

−

−2.00

−1.28

−3.1

−1.9

mV/

V

Iref

Reference Input Current (Figure 2)

IK = 1 mA, R1 = 220 k, R2 = R

TA = −40°C to +125°C

−

81

190

−

81

190

−

81

190

nA

DIrefT

Reference Input Current Deviation Over Tem-

perature Range (Figure 2, Note 7, 8)

IK = 1 mA, R1 = 10 k, R2 = R

−

22

55

−

22

55

−

22

55

nA

Imin

Minimum Cathode Current For Regulation

VKA = Vref (Figure 1)

−

40

80

−

40

80

−

40

80

mA

Ioff

Off−State Cathode Current (Figure 3)

VKA = 36 V, Vref = 0 V

−

180

1000

−

180

1000

−

180

1000

nA

|ZKA|

Dynamic Impedance (Figure 1, Note 8)

VKA = Vref, DIK = 1.0 mA to 100 mA

f v 1.0 kHz

−

0.22

0.5

−

0.22

0.5

−

0.22

0.5

W

6. Tlow = −40°C for NCP431BI, NCP431BV, NCP432BI, NCP432BV

= 0°C for NCP431BC, NCP432BC

Thigh = 70°C for NCP431BC, NCP432BC

= 85°C for NCP431BI, NCP432BI

= 125°C for NCP431BV, NCP432BV

7. Guaranteed by design

8. The deviation parameter DVrefT is defined as the difference between the maximum and minimum values obtained over the full operating

ambient temperature range that applies.

The average temperature coefficient of the reference input voltage, Vref is defined as:

Vref

ppm

° C

+

DVref

Vref@25°C

106

DTA

+

DVref 106

DTA Vref@25° C

aVref can be positive or negative depending on whether Vref Min or Vref Max occurs at the lower ambient temperature.

Example: DVrefT = 17 mV and slope is positive

Vref = 2.5 V, DTA = 165°C (from −40°C to +125°C)

aVref +

0.017 @ 106

165 @ 2.5

+ 41.2 ppm ° C

9. The dynamic impedance ZKA is defined as: (|ZKA| = (DVKA/DIK). When the device is programmed with two external resistors, R1 and R2,

the total dynamic impedance of the circuit is defined as: |ZKA’| [ |ZKA| (1 + (R1/R2))

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