NCP301HSN45T1 查看數據表（PDF） - ON Semiconductor

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NCP301HSN45T1

Voltage Detector Series

ON Semiconductor 

NCP300, NCP301

APPLICATION CIRCUIT INFORMATION

5.0 V

Vsupply

2 Input

NCP301

LSN45T1

1

Reset Output

3 GND

3.3 V

2 Input

NCP301

LSN30T1

1

Reset Output

3 GND

Low state output if either power

supply is below the respective

undervoltage detector threshold

but greater than 1.0 V.

Figure 28. Dual Power Supply Undervoltage Supervision

VDD

RH

2 Input

VDD

RL

NCP301

LSN27T1

1

Reset Output

Microprocessor

Reset

3 GND

GND

Figure 29. Microprocessor Reset Circuit with Additional Hysteresis

Comparator hysteresis can be increased with the addition of

resistor RH. The hysteresis equations have been simplified and

do not account for the change of input current Iin as Vin crosses

the comparator threshold. The internal resistance, Rin is simply

calculated using Iin = 0.26 mA at 2.6 V.

Vin Decreasing:

ǒ Ǔ Vth +

RH

Rin

)

1

ǒVDET*Ǔ

Vin Increasing:

ǒ Ǔ Vth +

RH ) 1

Rin ø RL

ǒVDET* ) VHYSǓ

VHYS = Vin Increasing − Vin Decreasing

Test Data

Vth Decreasing

(V)

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2.70

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2.70

2.70

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2.70

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2.70

2.70

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2.70

2.70

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2.70

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2.70

Vth Increasing

(V)

2.84

2.87

2.88

2.91

2.90

2.94

2.98

2.70

3.04

3.15

VHYS RH RL

(V) (W) (kW)

0.135 0

−

0.17 100 10

0.19 100 6.8

0.21 100 4.3

0.20 220 10

0.24 220 6.8

0.28 220 4.3

0.27 470 10

0.34 470 6.8

0.35 470 4.3

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