DESCRIPTION
The SSP-21120 Series of 28 Vdc,
Solid-State Power Controllers (SSPCs)
replace electromagnetic circuit break-
ers and solid-state relays rated for 40,
60, and 80 amperes. The SSPCs offer
status outputs and permit external
input logic control allowing for remote
location near to the load. The three
models in the series differ only in rated
current, so that fault and I
2
T trip char-
acteristics can be selected to protect
wiring and loads.
Using Power MOSFET switches, these
Power Controllers offer low “on” resis-
tance, low voltage drop, high “off”
impedance, and low power dissipation.
Built with Power MOSFETs and cus-
tom monolithics and using thick film
hybrid technology, they offer small
size, low power, and high reliability in a
module.
Built-In-Test (BIT) has been provided to
monitor, in real time, the status of the
internal circuitry as well as circuitry exter-
nal to the SSPC. This BIT monitors MOS-
FET failure and control circuit failure.
The SSP-21120 Series will operate
over the temperature range from -55°C
to +85°C with no thermal derating, see
ordering information.
APPLICATIONS
Designed to replace circuit breakers in
land, air, and space vehicles, these
Solid-State Power Controller Modules
provide status outputs for light and
heavy overloads as well as minimum
load current.
28 V DC S OLID-S TAT E POWER
CONT ROLLER MODULE
FEATURES
True I
2
T Protection
No Thermal Derating
Isolated Control Circuitry
MIL-STD-704 Compliant
Status Outputs
Instant Trip Protection
Low Power Dissipation
Solid-State Reliability
Internal P.S.
POWER IN
POWER OUT
NOTE: *NEUTRAL = POWER GROUND; **V BIAS SUPPLY COMMON = SIGNAL GROUND
V BIAS SUPPLY COMMON**
CONTROL COMMAND
STATUS 2
STATUS 1
NEUTRAL*
V BIAS SUPPLY INPUT
Control
Hybrid
Control
Hybrid
Sense Circuit
FET
SSP-21120
1995, 1999 Data Device Corporation
FIGURE 1. SSP-21120 BLOCK DIAGRAM
S S P-21120