LT-248
REGULATED DC TO DC POWER CONVERTER
(Two Channel 0-5 & 5 Vdc High Power Light Dimmer)
The LT-248 is comprised of two DC to DC converters, one fixed @5Vdc and the other controllable from 0 to 5Vdc. The variable output portion is primarily designed to control the light intensity of incandescent bulbs in system lighting. The fixed output portion may be used when regulated 5Vdc up to 7.5 ampere power is required.
The variable output voltage is adjusted via a remote control rheostat 5K ohm 1/2 watt to ground.
Specifications
Input Voltage
28 Vdc NOM., 22 to 36 Vdc
28 Vdc NOM., 22 to 36 Vdc
Input Current
3.4 Amps typ at 28 Vdc input and full load.
5.2 Amps maximum at 18Vdc input and full load.
3.4 Amps typ at 28 Vdc input and full load.
5.2 Amps maximum at 18Vdc input and full load.
Output Voltage
#1: 0-5 Vdc regulated
#2: 5 Vdc fixed regulated
#1: 0-5 Vdc regulated
#2: 5 Vdc fixed regulated
Output Current
#1: 0- 7.5 Amps continuous
#2: 7.5 Amps continuous
#1: 0- 7.5 Amps continuous
#2: 7.5 Amps continuous
Regulation
2% for load, 2% for line and 2% for temperature
2% for load, 2% for line and 2% for temperature
Ripple
10 mVpp typ at 25c, 25mVpp maximum
10 mVpp typ at 25c, 25mVpp maximum
Overload (OL)
Deliver 110% output power for 2 hours
Deliver 110% output power for 2 hours
Protection(OL)
Withstands without damage or degradation load exceeding 110% to an output short circuit. Unit delivers rated output power upon removal of the overload condition
Withstands without damage or degradation load exceeding 110% to an output short circuit. Unit delivers rated output power upon removal of the overload condition
Protection (SC)
Under a output short circuit condition, the input current folds back and the output current is limited to a safe value
Under a output short circuit condition, the input current folds back and the output current is limited to a safe value
Protection (OV)
Output voltage is limited to approx 130% of rating even though the remote rheostat opens or shorts for output #1 or certain types of internal failure.
Output voltage is limited to approx 130% of rating even though the remote rheostat opens or shorts for output #1 or certain types of internal failure.
Reverse Polarity
A reverse polarity diode is placed across the input to trip a MIL-C-6809 5 amp circuit breaker in the event of input reverse polarity.
A reverse polarity diode is placed across the input to trip a MIL-C-6809 5 amp circuit breaker in the event of input reverse polarity.
Efficiency
75% typical
75% typical
Temperature
-55° C to +71° C
-55° C to +71° C
Altitude
55,000FT
55,000FT
Environmental
DO-160C ENV. CAT F2ZBB(MLV)XXXDFSAAAXXXZKXX
DO-160C ENV. CAT F2ZBB(MLV)XXXDFSAAAXXXZKXX
Connector
Unit mates with KPTO6A14-5S(SR)
Unit mates with KPTO6A14-5S(SR)
Finish
Gold iridite per MIL-C-5541 Class 1A
Gold iridite per MIL-C-5541 Class 1A
Weight
1.2 LBS (544 grams)
1.2 LBS (544 grams)
Size
1.65 H x 4.00 W x 5.03 L inches (Less protrusion of connector and screw heads)
4.1 H x 5.1 W x 12.8 L cm
1.65 H x 4.00 W x 5.03 L inches (Less protrusion of connector and screw heads)
4.1 H x 5.1 W x 12.8 L cm
