UTCLM1851

LINEARINTEGRATEDCIRCUIT

4

QW-R122-007,A

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Normal Fault Current Sensitivity

Figure 1 (Note 3)

3

5

7

mA

Normal Fault Trip Time

500Ω Fault, Figure 2 (Note 2)

18

ms

Normal Fault with Grounded Neutral

Fault Trip Time

500Ω Normal Fault, 2Ω Neutral,

Figure 2 (Note 2)

18

ms

Note 1: For operation in ambient temperatures above 25℃, the device must be debated based on a 125℃

maximum junction temperature and a thermal resistance of 80℃/W junction to ambient for the DIP and 162/W

for the SO Package.

Note 2: Average of 10 trials.

Note 3: Required UL sensitivity tolerance is such that external trimming of UTC LM1851 sensitivity will be necessary.

Note 4: This externally applied current is in addition to the internal ''output drive current '' source.

A

+

- 300mV

Ct

0.002

Iss

1k

31V

1.5M

Vcc

OP AMP

OUTPUT

SCR

TRIGGER

TIMING

CAP

-IN

+IN

GND

2

3

6

4

8

5

1

7

0.047μF

800Hz

100k

FIGURE 1.Normal Fault Sensitivity Test Circuit

the gate of an SCR.