Please see the
Sub or TPS-28C
NIGHT VISION APPROVED
for All Lighting Needs
AC Volts Tracking
your LAMP bulbs life by 5 Years
with our Soft Start
0 - 24
/ 0-24 Vdc / 0-14 Vdc / 0-5 Vdc /
L 5.25" x W 2.70" x H 2.00"
to +70° C / 100,000 Run Time
Consult factory for custom slew rates and other
This unit come with
a full 1 year grantee!
ECCN: EAR99 "standard electronics, no limitations"
Schedule B: 8504.40.7007 " using standard
electronic components "
Schedule C: U.S.A.
Meets FAA DO-160A EMI / RFI Testing
Meets FAA DO-160A Conducted & Radiated Testing
Meets FAA DO-160 Water & Vapor Testing
Meets FAA DO-157 Pulsed Voltage Input Testing
All Parts are Mil Specification Rated
Meets FAA -- STC NUM. SA2681SO T.C. A22CE
Was used in the in side of the Navigation Power Box for this STC.
25 Pin Gold
"D" Connector Kit
Solder Cup (mating)
Positronic Connector Kit comes with every TPS-28
Ask about our Avionic Shop Dealer Discounts
for system operation
- Input Voltage: 19 - 42 VDC Standard / 44 Volts Absolute
Fixed Voltages: Output VDC 5 / 14 / 28 *
Adjustable Voltages: Output VDC 0-5 / 0-14 / 0-28 *
- Input tracking Voltages-(Output voltages)
- 0-5 Vdc for ( 0-5 / 0-14 / 0-28 ) *
- 0-14Vdc for ( 0-5 / 0-14 / 0-28 ) *
- 0-28 Vdc for ( 0-5 / 0-14 / 0-28 ) *
- VAC tracking input - (Output voltages)
- 0-115 Vac Input for DC
Output ( 0-5 / 0-14 / 0-28 )
- Other Features
- Half bright Day / Night switch ( switchable )
- Over Voltage FAILSAFE protection ( programmable )
- Soft-Start Voltage ( adds extra life to your lights )
- 6.0 Amp. Continuous Output ( max. standard )
- Universal programmable connector ( 25 pin D )
- Multi-Dimmer tracking ( from a single source )
- Input Voltage 19 - 42 Volts DC ( max. standard )
- Internal Fused at 12.0 AMP's ( max. standard )
- Tracking with noise immunity to radio signals
- AC tracking voltage 0 - 115 VAC
- Tracking frequency Volt AC Input 60-1000 HZ
- Temperature Range -25 to +70 Degrees C
- Installation manual for 18 different configurations
- Short circuit fold-back protection. ( max. time 3 MIN. )
- Includes D type 25 pin mating connector and cover.
- Solder cup type matting connectors
- TPS-28 comes in a solid aluminum casting,
- Four large mounting holes ( DIA. 0.190 ).
- Weighs less than 1 LB.
- Size ( including mounting ears ) High 3.00 x Length 5.25 x Width 2.70
- WARRANTY: The TPS-28 comes with a one year limited warrant
The TPS-28 is a switching power supply. Because it's a switching supply it runs
cooler and uses less power than normal lighting supplies. The unit is
programmed, by a connector, to your correct voltage and options. The connector
supplies both the input and output voltages to run the unit and your lighting.
The tracking feature, one of several unique features, allows you to tie the
output of an existing lighting system to the units tracking input feature. This
allows the TPS-28 to track the other Lighting power supplies. The TPS-28 can be
run in a fixed voltage operation, adjustable voltage operation, or tracking
voltage operation. The unit has a selectable over-voltage protection option,
insuring that your lighting will never be burnt out by over-voltage. Short
circuit protection is also provided: if a wire should short for several seconds,
the unit goes into a fold-back mode allowing the unit to shut down and then
restart. If for some reason the short lasts for several minutes, the unit is
designed to blow the fuse thereby abating the chance of a fire. The unit also
has a PWM fail circuit: if for some reason the voltage controlling circuit fails
the unit is designed to go into a shut off mode. The TPS-28 has a special
feedback loop designed to run instrument lighting and does not have
instantaneous voltage changes. This helps to eliminate those flickers and
flashes when an engine changes it's output RPM.
- Tracking voltage, what it is and how it works.
- When you need to have the TPS-28 adjust its output voltage to follow another
supply voltage, you need to use the tracking input of the TPS-28. The tracking
input tells the TPS-28 how much voltage it should be putting out in proportion
to the other lighting power supply. This works for both fixed and variable
lighting supplies. You will need to select the proper range for the TPS-28 to
run your application. We have supplied all the standard configurations of most
lighting systems that you will need. The unit also has an AC tracking input of
0-90 Volts that allows 60 - 1000 Hz to be applied to the unit. This allows the
DC lighting to be adjusted to an AC lighting circuit.
- Dimmer switch, and what it does.
- The half bright dimmer switch is designed to work with any voltage or mode of
operation. When the switch is in the on position this will dim the lights that
are attached to the TPS-28 to half their brightness.
- Dimmer pot resistor, and what it is used for.
- When you are not using a fixed voltage output, or a tracking voltage output, you
will want to use a variable output for the TPS-28 lighting supply. The output of
the supply can be adjusted by a variable 1K pot from 0 volts to the maximum
voltage that you have selected for the TPS-28 supply. The 1k variable resistor
can be of any power value. The 5 volt reference is used to adjust the TPS-28s
supply feed back loop that controls the output voltage.
- Over voltage failsafe operation.
- There are three over voltage modes that are supplied with the TPS-28. Select the
over voltage level that coincides with your voltage. For maximum lighting
protection, combine this option with any of the others.
- What the TPS-28 will do for you:
- The Incandescent lighting controller is designed to provide long life for
your lights, with flexibility for almost every lighting situation that you will
run into. Almost any D.C. Lighting can be run with the TPS-28. The supply has a
soft-start mode that protects the filaments from those quick voltage jumps by
allowing a ramped-voltage rise when the unit is turned on, thereby extending the
life of the bulbs. In addition, you can add a day/night dimming switch that
allows you, in any brightness condition, to instantly dim the light(s) to half
their brightness. This feature was added for those cloudy, moonlit nights when
the lighting intensity fluctuates. It enhances your visibility to see in the outside
- Product Data Sheet:
- Technical notes for the TPS-28 (all specification are for maximum
1. The unit has a 1.3 volt drop from input to output at or below the
voltage of 28 VDC input. This is because
of its switching blocking design of the supply. However with a 30+ volts input,
the output will never
go above 28 volts if the unit is set to a 28 volt output range. At 0 volts the
unit output will be no more than 0.25 VDC.
2. The unit should always be well grounded to a flat metal surface to help
eliminate heat and provide good regulation.
3. Keep transmitter / receiver wires away from the unit. This will help
eliminate any interference the unit may generate.
4. If the unit is connected to a circuit breaker it should be of the 7 to 10
AMP type designed for use with 28 volts.
5. The TPS-28 can be used down to 12 volts but will never put out more
voltage than it's input has.
(reduced current output )*
6. Non-standard output voltages can be obtained, you must consult the factory
for correct wiring.
7. Tracking error will typically not exceed 6.0% with a stable input source.
8. Dimmer switch: output voltage will be typically 50% of what the output
voltage was when applied.
9. Dimmer switch line current will not exceed 5 ma.
10. Dimmer switch line voltage will not exceed 6 volts.
11. Tracking input line current will not exceed 10 ma.
12. When using the unit as an adjustable output, you should always use a 1K
You may use one Pot to adjust more than one TPS-28 at one time.
13. Pin 20, max.current is 10ma.
14. Pin's 1- 4, max.current 1.5 Amps each.
15. Pin's 11,12,24,25, Max. current 1.5 Amps each.
16. Pin 14 input current Max. less than 1ma.
17. Never connect the outputs of a TPS-28 to another TPS-28, the units DO
NOT current share.
You may connect the output of one TPS-28 to the tracking input of another
18. When using more than one TPS-28 with a half bright dimming switch: always
use isolation diodes or use a
separate switch contact for each circuit to
19. The PWM's under voltage circuit will not let the unit operate until the
input voltage reaches at least 10 VDC.
20. If the unit goes into over voltage it is designed to blow the fuse in the
21. Connector style is a 25pin "D" female / solder cup / slide-lock
type for the connecting power cable.
22. There are four mount holes in the TPS-28's two flanges, holes are 0.190
23. Never paint the TPS-28 housing. This will cause the heat transfer to be
24. The TPS-28 can be used to run LED's, Wheat
grain bulbs, Quartz lighting, Tungsten
25. Maximum output current is 6.0 AMPs continuous at any output voltage
selected. Surge currents 8 AMPs
26. The input voltage to the TPS-28 has surge protection that goes into
operation above 45.0 volts.
& BULB LIFE
kills most of your bulbs or lamps in an aircraft? Your startup of
the electronics. When you flip the power switch you get a huge inrush of
current into the lamps or bulbs until the electron current heats up the filament.
during that heat up time the filament wiggles and wobbles causing
fractures in the filament to start to break. Then months later you
lamp is out and your are back to the avionics shop for a bulb change and a
TPS-28 eliminates all that cost. with our soft start circuit, The
TPS-28 limits that inrush electron current. Saving you hundreds of dollars
and hours of repair time at the avionics shop.
of having this!
other guys lighting controller
Lamps are ~ 40ma = 0.040 amps @ 12
Lamp Types 328 / 327
Lamps are ~ 40ma = 0.040 amps @ 12
Lamp Types 328 / 327
Saving - operation of an Aircraft
Here is a typical scenario. You have 28 V and you
want to get to 5 Volts @ 6 Amps, so you think "I will use some power
resistors or a linear regulator because they are cheap"!!! You
just cost the customer 200 watts of needless power and heat every hour he
runs the aircraft. On top of that you may be burning up your aircraft
|What does it cost in fuel? Well if you do the
math, 200 watts comes out to be about 1/4 of a horse power to the engine.
It does not sound like much but add that fuel cost in and after hours of
flying its like adding another person to the aircraft. You have burned up
thousands of dollars of fuel. In the long run, those cheap power resistors
ended up costing your customer lots of money.
is the answer
|What is the difference between a linear regulator and
resistors verses the TPS-28? Well, everything in the world. The TPS-28 is
a switching power supply that only takes a small amount of power to
get to the 5 Volts or to whatever voltage you need. Switching
regulators use charging circuits and do not dissipate large amounts of
heat to do the power conversion.
||Is there any other way of doing low cost power
conversion? NO, not unless you can change physics. The TPS-28 has an
efficiency of about 90%. That's 80% better than power resistors or a
linear regulator. The real answer to the question is this: In
a very short time the TPS-28 more than pays for itself just in lower fuel