DC POWER CONVERTERS TSO'D


 
 


 

FAA TSO-C71 REGULATED DC TO DC CONVERTER
LIGHT DIMMER WITH EXTERNAL VOLTAGE CONTROL

The LT-53, LT-73 and LT-103 are pulse width-modulated DC to DC converters that provide regulated power.

These converters transform an unregulated 28 VDC to a regulated and adjustable DC output via a remote control voltage; 0 to 5 VDC typical or 0 to 28 VDC.

The LT-Series are used to control the light intensity of incandescent bulbs in aircraft instrument lighting when voltage control is required.


eatures:

  • State of the art design for regulation and positive logic for output overvoltage protection.
  • Other voltage control range is available.
  • The Model LT-Series is serviceable, small and lightweight (33 watts per pound and 1.7 watts per cubic inch).
  • Maximum output voltage is adjustable with an internal trim pot.
  • Designed to meet various applicable portions MIL-STD 704 notice 3, MIL-STD-202 and MIL-T-5422F class 1A.

Specifications:
Input Voltage: 28 VDC nom., 20  to  40 VDC.
Output Voltage:  Adjustable with external voltage from 0 to 5 VDC.
Regulation:  2% for line, 2% load and 2% temperature.
Output Ripple:  25 mVp-p.
Protection (Overload):  Input and output current pulse when overload exceeds approximately 125% of rating.
Protection (Overvoltage):  Output voltage is limited to approximately 125% of rating eventhough remote control rheostat opens or shorts, or internal failure occurs.
Temperature:  -55°C to +71°C (sufficient cooling required @ +71°C ambient)
Altitude:  55,000 Feet.
Size:  2.3" H x 2. 3" W x 5.8" L.
5.7 cm H x 5.7 cm W x 14.6 cm L
Weight:  1.5 lbs. (683 grams).
 Compliance:  FAA TSO-C71

 

 Characteristics  LT-53   LT-73

 LT-103
Max VA Rating  50 70  100
 Input Voltage (VDC)  20 to 40  20 to 40  20 to 40
 Input Current (ADC)
  • @20VDC In
  • @28VDC In

 

3.7
2.5

 

4.0
3.2

 

5.8
4.2
 Output Voltage (VDC)  0 to 5  0 to 12  0 to 28
 Output Current (ADC)  10  5.8  3.6
 Efficiency  73  78  84

 

Pin Descriptions:
 PIN NO.  DESCRIPTION  REMARKS
 A  +28 VDC input  20 to 40 VDC
 B  Common Ground  Input/output return
 C  + VDC Output  Adjustable DC Output
 D  Remote Control  0 to 5 VDC
 E  Remote Control  0 to 28 VDC

Connectors:
 Model Mating Plug Receptacle
 LT-53  KPT-06A-14-5S  PT-02E-14-5P
 LT-73  MS3106A14S-5S-X  MS3102A14S-5P-X
 LT-103  MS3106A14S-5S  MS3102A14S-5P

OUTLINE DRAWING

EXTERNAL WIRING

INPUT VS. OUTPUT VOLTAGE

 


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