MII 52421 Datasheet

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

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.

Applications:

Meets The Demanding Requirements Of Space
Platform Environments, Where Precise

Temperature Control Is Required.

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 (TA)
Storage Temperature (T
Maximum Steady State V
Peak Transient Input V
Steady State Load Current…(Source or Sink)

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)

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STG

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IN

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IN(T)

+180 Volts DC for 5 Secs.

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-55°C to +125°C

-65°C to +165°C
+132 Volts DC

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 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

12/18/01

52421

SOLID STATE THERMOSTAT CONTROLLER

GENERAL ELECTRICAL SPECIFICATIONS

(25°C unless otherwise stated)

TEST CONDITIONS MIN MAX UNITS

Quiescent Power Supply
Current

Over voltage
Current Spikes

Heater Current Terminals #3 - #4 = Heater Load

Output Off Current Terminal #1 = +126 VDC

Full Load
Saturation Voltage

Self Test
Input
Impedance
On Time,
Load Current

Off Time,
Load Current

Terminal #1 = +126 VDC

(Terminals 3 and 4) = 0 A

I

LOAD

RTD = Max
Between Terminals #1 and #2 = +180 VDC
For 5 seconds
RTD = Min

Terminal #1 = +120 VDC 1.1 A

Between Terminals #3 and #4 =
R shunt ≤ 10 ohms
RTD = Max
T
T

= 25°C

CASE

= 125°C or T

CASE

CASE

Terminal #1 = +120 VDC
Test Load, 120 ohms ±5%, 250 Watts
RTD = Min

Measured between Terminals #4 and #2

V

SAT,

T
T

= 25°C

CASE

= 125°C or T

CASE

CASE

Terminal #1 = +120 VDC
RTD = Max
As Measured between Terminals #8 and #9 5,000,000 Ω
Terminal #1 = +120 VDC
RTD switched Max to Min
Measuring the 10-90 time of the rising Heater
Load Current, Terminals #3 and #4
Terminal #1 = +120 VDC
RTD switched Min to Max
Measuring the 90-10 time of the falling
Heater Load Current, Terminals #3 and #4

= -55°C

= -55°C

5.5 mA

50.0 mA

±250

±1

1.9

2.8

uA

mA

V
V

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 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

12/18/01