CM4 App Note 260424 issue 2.1.docx
Document No. 260424
Page 23 of 29
Paralleled Remote Voltage/Current Adjustments
The simplest way to achieve remote voltage/current programming with paralleled outputs is to operate the modules in share parallel mode.
Follow the procedure outlined earlier to configure the outputs in share parallel mode and once configured in this mode, all the V
CONTROL
and COM
pins can be connected together. Remote voltage/current programming can then be performed exactly as with a stand-alone module.
It is not recommended to use remote voltage/current programming in normal parallel mode.
Paralleling Across Multiple Products
Paralleling across multiple products is not possible without external protection (such as external diodes or controlled MOSFETs) to prevent
circulating currents between each product. Failure to provide such protection may result in damage to the power supplies. Consult TDK-Lambda
for details on how best to implement such applications.
When modules are paralleled across multiple products, the outputs in each product will not be synchronised and the peak to peak output ripple
may contain beat frequencies in the audio spectrum.
WARNING!
Care must be taken to avoid differential voltages between the negative power output terminals of share mode paralleled modules as this can cause
errors at the control pins. To avoid this, it is recommended to use TDK-Lambda parallel links to parallel modules in share mode.
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