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These are regulated switching power converters,
designed to allow the use of 12 volt equipment in 24 volt vehicles. These are attractive, reliable, robust DC/DC converters
good for fork lifts, off-road, construction and recreational equipment. Those that are listed as "forced air cooling" should be
protected from water, spray, and dust that could be sucked into the power supply.
PST-D24/12-100 and -150 Application Notes
Explanation of Operation:
This DC/DC converter has two power supplies. The main one is a 10 amp, 13.8 volt output. The secondary one has a
12 volt, low current output. The purpose of the secondary circuit is to keep a clock radio and its programmed station selectors
alive while the main output is turned off. Many applications don't need this output.
Input Leads:
The input has four leads. The black goes to chassis or battery ground. The red wire goes to battery positive (+24
volts). The white input wire is a control wire. To turn the unit on the white wire must be connected to +24 volts. This can be
done by wiring it permanently, or it may be connected through a vehicle key switch. The orange wire is also a control wire. It
can be attached to +24 permanently by hard wiring, or through a switch.
If the low current 12 volt output is not required, the orange input wire may be tied off or connected to the
white wire input.
Output Leads
The main power leads are the white and black. White is the +13.8 volt output, black is the ground. If required
the orange 12 volt output can be wired to a radio “keep alive” terminal, pilot light, or put to other uses. If not
required, it should be tied off in a way that it won’t short to chassis.
Applications:
Wheel chair accessories.
Often it is desirable to run 12 volt equipment on a 24 volt wheel chair. For example, a laptop computer, a car
radio, or a seat pump. It is not wise to do this by simply connecting across one of the 12 volt batteries. This causes the
batteries to be out of balance, and then during the charging process one of the batteries will be over charged while one will
be under charged. A good solution is to use a DC/DC converter to convert the 24 volts to 12 volts.
An automobile cigarette lighter socket, which is available at Radio Shack, makes a convenient 12 volt power point
to wire the DC converter output to.
For a permanent installation, such as a seat floatation pump, the DC converter can be wired directly to the pump,
bringing out the orange control wire to a switch if desired.
Mounting:
The DC converter has a mounting flange with four self-tapping screws included.
What size do I
get?
To determine the amperage you would need add up the watts of all the equipment and divide by 13.8 volts.
Samples and retail sales are available for those listed as "in stock." Minimum purchase quantities apply for the
others.
These are also known as 24 volt voltage reducers, and voltage regulators.
| DC-DC Converters |
15 Amp Peak
DC to DC Converter
In
Stock |
10 Amp Peak
DC to DC Converter
In
Stock |
To purchase see below. |
| Part Number |
PST-D24/12-150 |
PST-D24/12-100 |
Part Number |
| Input Voltage |
18 to 28 VDC |
18 to 28 VDC |
Input Voltage) |
| Max Input current at No Load |
100 mA |
100 mA |
Max Input current at No Load |
| Output Voltage |
13.8 VDC |
13.8 VDC |
Output Voltage |
| Output Adjustment |
± 3V |
± 3V |
Output Adjustment |
| Max Output Current(s) |
15 Amps |
10 Amps |
Max Output Current |
| Max Output Power (10 minutes) |
200 Watts |
138 Watts |
Max Output Power (10 Minutes) |
| Max Output Power (3 hours) |
160 Watts
(12 Amps) |
95 Watts
(7 Amps) |
Max Output Power (3 hours) |
| Max Output Power (continuous) |
140 Watts
(10 Amps) |
70 Watts
(5 Amps) |
Max Output Power (continuous) |
| Output current limit? |
No |
No |
Output current limit? |
| Output Plug Type |
Flying leads |
Flying leads |
Output Plug Type |
| Efficiency |
85 % |
85 % |
Efficiency |
| Line Regulation |
±70 mV |
±70 mV |
Line Regulation |
| Load Regulation |
± 1% |
±1% |
Load Regulation |
| Switching frequency |
25 kHz |
25 kHz |
Switching frequency |
| Output ripple noise |
100 mV rms |
100 mV rms |
Output ripple noise |
| Remote power on/off |
No |
No |
Remote power on/off |
| Protection |
Over Voltage , Over Current ,
Short Circuit , Reverse Polarity , Over Load |
Over Voltage , Over Current ,
Short Circuit , Reverse Polarity , Over Load |
Protection |
| Dimensions |
115 x 150 x 43 |
40 x 115 x 43 |
Dimensions |
| Weight |
600 gms |
200 gms |
Weight |
| Temperature |
0 to 40°C, 25 degree rise above ambient at
continuous full power |
Temperature |
| Additional Features |
Passive Cooling |
Passive Cooling |
Additional Features |
| Retail Price (Call for Volume Pricing) |
PST-D24/12-150
1-10 $61.60
11-100 $46.46
101-500 $31.80
500+ $29.80
  |
PST-D24/12-100
1-10
$36.47
11-100 $31.86
101-500 $20.48
500+
$18.80
|
|
Advantages:
 Inexpensive High Current Switchmode DC/DC
Converter.
High efficiency.
Excellent line and load regulation.
Wide input voltage
range. |
