DUAL SOLID STATE THERMOSTAT CONTROLLER
Space Application Series...
Mii
MICROCIRCUITS DIVISION
Features:
•
•
•
•
•
Single And Dual Resistance Temperature
Detectors
Redundant Circuitry For Assured Power &
Reliability
“ON” Or “OFF” Conditions (Dual RTD Units Available
In Either “AND” And “OR” Configurations)
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 Controllers operate with external RTD(s) (Resistance Temperature Device) to sense
temperature and provide power switched (On / Off) output within a given temperature window. Two within the series
furnish inputs for two (2) independent RTD’s. One RTD sensor controls a MOSFET switch to sink HEATER current to
power return ground. The second sensor controls an additional MOSFET switch that either parallels the first (the “OR”
configuration) or adds a series MOSFET switch (“AND” configuration) that controls the Heater source voltage.
The device block diagram, Figure 1, depicts the “AND” configuration. The “AND” configuration ASSURES that the
HEATER POWER IS ONLY ON when both sensors agree that the ON temperature level has been reached. The “OR”
configuration (not shown) ASSURES that the HEATER POWER IS ON when either sensor detects that the ON
temperature level has been reached.
A third model, which provides a single channel RTD to controlled MOSFET is available.
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
)
........................................................................................................................
-55°C to +125°C
Storage Temperature (T
STG
)
........................................................................................................................
-65°C to +165°C
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:
microsales@micropac.com
5/22/02
Pg. 1 of 5
DUAL SOLID STATE THERMOSTAT CONTROLLER
GENERAL ELECTRICAL SPECIFICATIONS
(25°C unless otherwise stated)
TEST
Quiescent Power Supply
Current
Over voltage
Current Spikes
Heater Current
CONDITIONS
Terminal #1 = +126 VDC
I
LOAD
(Terminals 3 and 4) = 0 A
RTD #1 and RTD #2 = Max
Between Terminals #1 and #2 = +180 VDC
For 5 seconds
RTD #1 and RTD #2 = Min
Terminals #3 - #4 = Heater Load
Terminal #1 = +120 VDC
OR configuration:
RTD #1 or RTD #2 = Min
AND configuration:
RTD #1 and RTD #2 = Min
Terminal #1 = +126 VDC
Between Terminals #3 and #4 =
R shunt
≤
10 ohms
RTD #1 and RTD #2 = Max
T
CASE
= 25°C
T
CASE
= 125°C or T
CASE
= -55°C
Terminal #1 = +120 VDC
Test Load, Terminals #3 and #4 =
120 ohms
±5%,
250 Watts
RTD #1 and RTD #2 = Min
V
SAT,
Measured between
Terminals #4 and #2
T
CASE
= 25°C
T
CASE
= 125°C or T
CASE
= -55°C
Terminal #1 = +120 VDC
RTD #1 and RTD #2 = Max
As Measured between
Terminals #11 and #12 , and
Terminals #13 and #14
Terminal #1 = +120 VDC
RTD #1 and RTD #2 = Max
Applied to Terminals #11 and #12, and
then Terminals #13 and #14
Measured via the Heater Current On / Off
States.
Terminal #1 = +120 VDC
RTD #1 and RTD #2 switched Max to Min
Measuring the 10-90 time of the rising Heater
Load Current, Terminals #3 and #4
Terminal #1 = +120 VDC
RTD #1 and RTD #2 switched Min to Max
Measuring the 90-10 time of the falling
Heater Load Current, Terminals #3 and #4
MIN
MAX
10.8
50.0
UNITS
mA
mA
1.1
A
Output Off Current
±250
±1
µA
mA
Full Load
Saturation Voltage
1.9
2.8
500,000
V
V
Ω
Self Test
Input
Impedance
Self Test
Turn On
Voltage
4.50
V
On Time,
Load Current
Off Time,
Load Current
1.0
mS
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:
microsales@micropac.com
5/22/02
Pg. 2 of 5
DUAL SOLID STATE THERMOSTAT CONTROLLER
DUAL CHANNEL TERMINAL NUMBER DESCRIPTION
TERMINAL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
REF
Vin
AGND
+H
-H
RTD1-H
RTD1-L
RTD1-S
RTD2-H
RTD2-L
RTD2-S
ST1
ST1 Return
ST2
ST2 Return
DESCRIPTION
Positive power supply voltage
Power return for all function
Current source for Heater (High Side)
Current return for Heater (Low)
RTD #1Current source
RTD #1 Current return
RTD #1Shield to case
RTD #2 Current source
RTD #2 Current return
RTD #2 Shield to case
Self Test #1
Self test #1 Common
Self Test #2
Self test #2 Common
Package Dimensions
.150 TYP
1.00
3.100
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:
microsales@micropac.com
5/22/02
Pg. 3 of 5
DUAL SOLID STATE THERMOSTAT CONTROLLER
TYPICAL PRESET “RTD” PROFILES AVAILABLE
52xxx Reference Mii P/N
“O” = OR configuration
“A”= And configuration
52369 “A”
52387 “O”
52388 “O”
52389 ”O”
-42°F
-35°F
52372 “O”
52377 “O”
Ton
Toff
-80°F
-73°F
52383 “A”
-70°F
-63°F
52382 “O”
-70°F
-63°F
52381 “A”
-50°F
-43°F
52370 “A”
52375 “A”
Ton
Toff
-28°F
-21°F
52379 “A”
52380 “A”
-10°F
-3°F
52378 “O”
52384 “A”
0°F
7°F
52371 “O”
23°F
30°F
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.
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:
microsales@micropac.com
5/22/02
Pg. 4 of 5
DUAL SOLID STATE THERMOSTAT CONTROLLER
Functional Block Diagram
+120Vdc
1
HIGH SIDE
SWITCH
FUNCTION
VOLTAGE
REFERENCE
POWER
XISTOR
0Vdc
2
5
6
T
7
SELF TEST
DRIVER
BRIDGE/
CONTROLLER
11
SELF TEST
12
3
10
LOW SIDE
SWITCH
FUNCTION
VOLTAGE
REFERENCE
8
9
13
SELF TEST
14
SELF TEST
DRIVER
BRIDGE/
CONTROLLER
POWER
XISTOR
GROUND PLANE
AND Connected Redundant Pair (Shown)
OR Configurations Also Available
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:
microsales@micropac.com
5/22/02
Pg. 5 of 5
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