User Instructions

2
1. Technical description
The step down converter DC/DC 2A (DC/DC20SD) is used for step down the input voltage from the range between 8V÷28V
DC to the voltage range of 4,5V÷24V DC at the output, adjusted with the P1 potentiometer. The maximum load current is Imax=2A
(Pmax=24W). The 3V difference between the input (lowered) and output voltage is required for the proper operation of the converter.
The module does not feature galvanic isolation between input/output (IN-AUX) and operates on common "ground" (0V) potential (IN-
and AUX- terminals are galvanically connected = common terminal).
1.1. Block diagram (Fig.1).
Fig.1. Block diagram of the converter’s module.
1.2. Description of components and connectors (Fig. 2, Table 1, Table 2).
Table 1.
No.
[fig.2]
Component’s description
[1]
IN LED light - red
[2]
Power connector of the DC/DC module
[3]
P1 voltage adjustment (4,5÷19V)
[4]
Jumper – voltage adjustment
[5]
AUX LED light – green
[6]
The DC/DC module’s connector (power supply and PSU)
[7]
PSU LED light – red
[8]
Mounting strip
Table 2.
[2], [6]
Description of module’s connectors
+IN
- IN
DC supply input
(8V÷28V DC, power consumption from the power source)
+AUX
- AUX
DC supply output
(+AUX= +U, -AUX=GND)
AW
Technical output of failure: OLP/SCP activation (short-circuit or overload protection)
Failure status: hi-Z (high impedance), normal status: L (0V, GND)
Fig.2. The converter module’s view.