LT-53, LT-73, LT-103
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.
Features:
- 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.
28 VDC nom., 20 to 40 VDC.
Output Voltage
Adjustable with external voltage from 0 to 5 VDC.
Adjustable with external voltage from 0 to 5 VDC.
Regulation
2% for line, 2% load and 2% temperature.
2% for line, 2% load and 2% temperature.
Output Ripple
25 mVp-p.
25 mVp-p.
Protection (Overload)
Input and output current pulse when overload exceeds approximately 125% of rating.
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.
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)
-55°C to +71°C (sufficient cooling required @ +71°C ambient)
Altitude
55,000 Feet.
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
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).
1.5 lbs. (683 grams).
Compliance
FAA TSO-C71
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)
|
3.7 |
4.0 |
5.8 |
| 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 |
