SENSITRON

SEMICONDUCTOR

TECHNICAL DATA

DATASHEET 5023, Rev D.1

©2007 Sensitron Semiconductor

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Phone (631) 586 7600 Fax (631) 242 9798

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SPDPXXD28 SERIES

whether or not it’s drawing current (GATE) and whether or not the LOAD and GATE outputs are valid responses

to the CONTROL input.

Table 6 – CONTROL, LOAD & GATE Truth Table

State

CONTROL

LOAD

GATE

Comments

1

L

L

L

SSPC failure or shorted LOAD output to ground

2

L

L

H

SSPC failure

3

L

H

L

Normal OFF condition

4

L

H

H

SSPC failure or shorted GATE output to BIAS supply

5

H

L

L

SSPC failure or shorted GATE output to ground

6

H

L

H

Normal ON condition with load current > 15% rated current

7

H

H

L

Tripped

8

H

H

H

Normal ON condition with load current < 5% rated current

Wire Size

MIL-W-5088L has a chart the shows wire size as a function of wire temperature and current. This chart is for a

single copper wire in free air. For an ambient temperature of 70

25 Amps continuously at a wire temperature of 200

temperature limited to 150

requires a 14-gauge wire.

Amendment 1 of MIL-W-5088L has a table for copper wire in a bundle, group or harness with condition on the

number of wires, percent of total harness capacity, etc. This table shows that a 12 gauge wire is necessary for

200

MIL-W-5088L has various figures showing derating for harnesses as a function of the number of current carrying

conductors for different altitudes. MIL-W-5088L only specifies wire for DC or RMS AC conditions, not for

transient or overload conditions. MIL-W-5088L and its amendment should be consulted to determine minimum

wire sizes for other currents and conditions.

For transient or overload conditions, the transient or overload happens so quickly that heat is not transferred

from the wire to the surroundings. The heat caused by the I

rise at a linear rate controlled by the heat capacity of the wire. The equation for this linear rise in temperature,

with respect to time, can be solved as: I

temperature rise allowed and the diameter of the wire. If the I

the I

SPD2P05D28 is 7.45 x 10

exceeds the SPDP25D28 I

matter of determining the maximum temperature rise of the application and deciding whether or not the wire will

be in a bundle and use the information above. Similarly, the I

are 1.72 x 10