NCP305 데이터 시트보기 (PDF) - ON Semiconductor

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NCP305

Voltage Detector Series

ON Semiconductor 

Rsense

NCP304, NCP305

Vsupply

Load

VDD

2 Input

NCP3015

LSQN2079T1

50 k

1

Reset Output

Microcontroller

3 GND

GND

This circuit monitors the current at the load. As

current flows through the load, a voltage drop with

respect to ground appears across Rsense where

Vsense = Iload * Rsense. The following conditions apply:

If:

ILoad t VDET − /Rsense

ILoad w (VDET −+VHYS)/Rsense

Then:

Reset Output = 0 V

Reset Output = VDD

Figure 31. Microcontroller Systems Load Sensing

2 Input

NCP3015

LSQN2475T1

3 GND

1

Reset

Output

Vsupply

Vin = 1.0 V to 10 V

2 Input

NCP3015

LSQN27T1

3 GND

1

Reset

Output

2 Input

NCP3015

LSQN2178T1

3 GND

1

Reset

Output

A simple voltage monitor can be constructed by connecting several voltage detectors as shown above. Each LED will

sequentially turn on when the respective voltage detector threshold (VDET− +VHYS) is exceeded. Note that detector

thresholds (VDET−) that range from 0.9 V to 4.9 V in 100 mV steps can be manufactured.

Figure 32. LED Bar Graph

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