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EPM12V2 Evaluation kit user guide
EPM12V2 Evaluation kit user guide
EPM12V2 EVALUATION KIT USER GUIDE
Technical note ELX1037 April 2021 www.eaton.com/magnetics
EPM12V2 EVALUATION KIT USER GUIDE
Technical note ELX1037 April 2021 www.eaton.com/magnetics
Remote on/off function
The EVK can switch the converter on or off by controlling the Remote ON/OFF signal in positive logic . If the status of ON/
OFF is open or from 1 .6 V to 5 V, the converter will turn on . Otherwise, if the status of ON/OFF is short to ground or from 0 V
to 0 .6 V, the converter will shut down .
The remote control circuit on EVK shows below . There are CTRL and 5 V pins at connector JP3 . For example, when CTRL is
high level, the converter will shut down . When CTRL is low level, the converter will turn on .
Figure 7:
Remote on/off circuit diagram
Table 4- Remote on/off conditions
Condition
CTRL
Q1
DC-DC ON
Low level
Off
DC-DC OFF
High level
On
Figure 8:
CNTL low level, DC-DC on
Figure 9:
CNTRL high level, DC-DC off
Table 3- Resistor value and switch position
Output voltage
Calculated
Rtrim
Option
5 V
2.7 kΩ
SW 1 : on
3.3 V
4.7 kΩ
SW 2 : on
2.5 V
6.2 kΩ
SW 3 : on
1.8 V
10 kΩ
SW 4: on
1.5 V
13 kΩ
SW 5 : on
1.2 V
20 kΩ
SW 6 : on
Voltage sensing
VS+ and VS- is the voltage sensing pin at the JP3 connector . VS+ and VS- are connected to the positive and negative
terminal of the load respectively . This function makes the converter detect the voltage across the load without being
disturbed by the impedance of the wires . The sense wire is not the main path of the system and carries a low current . It is
recommended to use twisted wires for the VS+ and VS- wires or shielded cables to avoid noise and unwanted inductance . If
voltage sensing is not needed, VS+ and VS- should connect to the positive and negative output terminals of the converter by
using the zero-ohm resistor each .
Figure 5:
Voltage sense configuration
Figure 6:
No voltage sense configuration
Positive logic
Table 5- Remote on/off conditions
Condition
CTRL
Q1
DC-DC ON
High level
On
DC-DC OFF
Low level
Off
Negative logic
Figure 10:
CNTL high level, DC-DC on
Figure 11:
CNTRL low level, DC-DC off
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