SENSITRON

SEMICONDUCTOR

TECHNICAL DATA

DATASHEET 5023, Rev D.1

©2007 Sensitron Semiconductor

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SPDPXXD28 SERIES

Board Layout

The current-carrying power circuit should be kept well away from the control circuit and other low-level circuits in

the system. It’s unlikely, but possible, that magnetic coupling could affect the control circuit when turning normal

loads on and off. However, in the case of an overload, the magnetic coupling could be 10 times greater than

with normal loads. Effects of such coupling could cause ‘chattering’ when turning on and off, oscillation, and the

possibility of turning the SPDPXXD28 back on after an overload. The SPDPXXD28 Series is a Trip-Free

device. Once tripped it will not turn back on until reset and commanded on again. Reset is accomplished by

bringing the CONTROL pin low and turning the SSPC back on is accomplished by bringing the CONTROL pin

high. Sufficient magnetic coupling between the current-carrying power circuit and the control circuit can negate

the Trip-Free characteristic.

MIL-STD-704F and MIL-STD-1275B

These standards cover the characteristics of the electrical systems in Military Aircraft and Vehicles. The

SPDPXXD28 Series meets all of the requirements of MIL-STD-704F including Normal, Emergency, Abnormal

and Electric Starting conditions with the Ripple, Distortion Factor and Distortion Spectrum defined in the

standard. The SPDPXXD28 Series also meets all of the requirements of MIL-STD-1275B including operation

with Battery and Generator, Generator Only and Battery Only for all of the conditions described in the standard

including Cranking, Surges, Spikes and Ripple. In addition, the SPDPXXD28 Series can withstand + 600 V

spikes for 10

μS. This capability is beyond that required by the standards cited above.

Figure 10 – SPDPXXD28

Rating vs. “Gain” and “Gain Return” Terminals

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10.00%

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30.00%

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90.00%

100.00%

10

100

1000

10000

100000

Proramming Resistor