Micropac Industries cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
905 E. Walnut St., Garland, TX 75040 (972) 272-3571 Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
12/18/01
52421
SOLID STATE THERMOSTAT CONTROLLER
Space Application Series...
Mii
HYBRID MICROELECTRONICS
PRODUCTS DIVISION
Features:
Operates With RTD Temperature Sensor
Output Is Either "ON" Or "OFF"
Standard And Custom Factory Settings Of:
- Resistance Control Set Points (Temperatures),
- Hysteresis, (Minimum/Maximum) And
- Timing (On/Off Delays)
-
Test (Load Power On/Off) Capability
Optional Mounting Configurations Available
Applications:
Meets The Demanding Requirements Of Space
Platform Environments, Where Precise
Temperature Control Is Required.
DESCRIPTION
Micropac's Space level Thermostat Controller 52421 operates with external RTD (Resistance Temperature Device)
temperature sensor and provides a power switched (On / Off) output within a temperature window. The RTD sensor is
conditioned then controls a high-side MOSFET power switch for an external HEATER.
Models are available with dual channels providing either "OR" or "AND" configurations.
Wired combinations of the "OR" configuration device, along with a single channel device, provides a tri-redundancy
control system which guarantees both the power ON and power OFF states of the Heater
ABSOLUTE MAXIMUM RATINGS
Operating Temperature (T
A
)
........................................................................................................................
-55C to +125C
Storage Temperature (T
STG
)
.......................................................................................................................
-65C to +165C
Maximum Steady State V
IN
..............................................................................................................................
+132 Volts DC
Peak Transient Input V
IN(T)
...........................................................................................................
+180 Volts DC for 5 Secs.
Steady State Load Current...(Source or Sink)
......................................................................................................
1.1Amps.
APPLICABLE QUALITY STANDARDS OF MICROPAC INDUSTRIES, INC.
MIL-PRF-38534 Class H and Class K Qualified.
MIL-PRF-19500 JAN S Qualified.
MIL-STD-883 Test Methods and Procedures
ISO 9001 Quality Standard
Micropac Industries cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
905 E. Walnut St., Garland, TX 75040 (972) 272-3571 Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
12/18/01
52421
SOLID STATE THERMOSTAT CONTROLLER
GENERAL ELECTRICAL SPECIFICATIONS
(25C unless otherwise stated)
TEST
CONDITIONS
MIN
MAX
UNITS
Quiescent Power Supply
Current
Terminal #1 = +126 VDC
I
LOAD
(Terminals 3 and 4) = 0 A
RTD = Max
5.5
mA
Over voltage
Current Spikes
Between Terminals #1 and #2 = +180 VDC
For 5 seconds
RTD = Min
50.0
mA
Heater Current
Terminals #3 - #4 = Heater Load
Terminal #1 = +120 VDC
1.1
A
Output Off Current
Terminal #1 = +126 VDC
Between Terminals #3 and #4 =
R shunt
10 ohms
RTD = Max
T
CASE
= 25
C
T
CASE
= 125
C or T
CASE
= -55
C
250
1
uA
mA
Full Load
Saturation Voltage
Terminal #1 = +120 VDC
Test Load, 120 ohms
5%, 250 Watts
RTD = Min
V
SAT,
Measured between Terminals #4 and #2
T
CASE
= 25
C
T
CASE
= 125
C or T
CASE
= -55
C
1.9
2.8
V
V
Self Test
Input
Impedance
Terminal #1 = +120 VDC
RTD = Max
As Measured between Terminals #8 and #9
5,000,000
On Time,
Load Current
Terminal #1 = +120 VDC
RTD switched Max to Min
Measuring the 10-90 time of the rising Heater
Load Current, Terminals #3 and #4
1.0
mS
Off Time,
Load Current
Terminal #1 = +120 VDC
RTD switched Min to Max
Measuring the 90-10 time of the falling
Heater Load Current, Terminals #3 and #4
2.0
mS
Micropac Industries cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
905 E. Walnut St., Garland, TX 75040 (972) 272-3571 Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
12/18/01
52421
SOLID STATE THERMOSTAT CONTROLLER
DUAL CHANNEL TERMINAL NUMBER DESCRIPTION
TERMINAL
REF
DESCRIPTION
1
Vin
Positive power supply voltage
2
AGND
Power return for all function
3
+H
Current source for Heater (High Side)
4
-H
Current return for Heater
5
RTD1-H
Current source for RTD #1
6
RTD1-L
Current return RTD #1
7
RTD1-S
for RTD #1 Shield to case
8
ST1
Self Test #1, "ON"
9
ST1 Return
Self test #1 Common
TYPICAL PRESET "RTD" PROFILES AVAILABLE
P/N TBD
P/N TBD
P/N TBD
P/N TBD
P/N TBD
Ton
-80F
-70F
-60F
-50F
-42F
Toff
-73F
-63F
-53F
-43F
-35F
P/N TBD
P/N TBD
P/N TBD
P/N TBD
Ton
-28
F
-10
F
0
F
23
F
Toff
-21
F
-3
F
7
F
30
F
RTD SENSORS NOT PROVIDED BY Micropac Industries, Inc.
The above preset thresholds and switching levels are based on the use of standard 1000 ohm RTDs.
Example: IEC-751, 1000 ohms at 0
C (ice point), resistance curve with an alpha of 0.003891 and with
an error not to exceed 0.75
F.
Package Dimensions
Micropac Industries cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
905 E. Walnut St., Garland, TX 75040 (972) 272-3571 Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
12/18/01
52421
SOLID STATE THERMOSTAT CONTROLLER
`
1
2
5
6
7
REFERENCE
VOLTAGE
BRIDGE/
CONTROLLER
POWER
XISTOR
DRIVER
SELF TEST
SELF TEST
+120Vdc
0Vdc
T
11
10
3
4
FILTER
Functional Block Diagram
CASE
PDF 
ZIP