Tech Support

Application Notes

ACuQor Hipot Balancing

This application note describes the correct method for hipot testing the ACuQor series of AC‑DC converters. The note provides an understanding of the difference in capacitance values from input‑to‑ground and from output‑to‑ground as well as a solution for balancing the voltage stresses.

AeroQor Single-Phase EMI Design App Note

This application note addresses DO-160G compliant solutions using SynQor’s Isolated Power Factor Correction modules and reviews electromagnetic interference design practices to meet the required standards.

Aqueous Cleaning and Soldering

This Application Note provides an overview of Aqueous Cleaning and Soldering Considerations for SynQor open‑frame, fully encased, and baseplated products.

Converter Thermal Resistance

This application note describes the thermal resistance of SynQor's DC‑DC power converters for open frame and baseplated or encased units.

Current Sharing on Full Feature Modules

This application note details the additional features available in SynQor's full-feature converter modules. There is substantial information provided to facilitate the use of the active current sharing feature for N+1 and parallel applications.

EMI Characteristics

This application note provides an overview of electromagnetic interference (EMI), the different standards and regulations, how these standards and regulations relate to DC-DC power modules, suggestions for external filtering solutions, and suggested layout and grounding practices.

Explanation of 100V Input Transient Protection

This application note provides an overview of SynQor's input transient protection features and explains the differences in protection ratings across our DC-DC converter product lines. It also answers some frequently asked questions concerning these features.

Guidelines for Testing SynQor DC-DC Converters

This application note describes common lab test procedures to evaluate DC‑DC converter performance.

Heat Sink Mount Application Note

This application note describes the heatsink attachment and mounting assembly sequence for SynQor modules

Input System Instability

This application note details the condition of input system instability that can occur because a DC‑DC converter appears incrementally as a negative resistance load. The note provides an understanding of why this instability arises, and shows the preferred solution for correcting it.

Interface Adaptor Boards

This application note describes the implementation of the interface adapter boards for applications where the customer elects to connect wires to a SynQor module instead of directly mounting to a printed circuit board. Mounting requirements, wiring directions, external component layout and descriptions as well as ordering information is included.

MIL-STD-461 Compliance

This application note describes which SynQor converters and filters have been tested in conjunction for compliance with MIL‑STD‑461 for the control of EMI in military systems. A breakdown of the individual requirements within the specification and the compliance of SynQor modules to each is provided.

Output Load Current Calculation

This application note provides a simple method to calculate the output load current using the current sense resistor found on SynQor's open frame DC-DC converters. All equations, turns-ratio and sense resistor values are included for the calculations.

Output Voltage Ripple Measurements

This application note explains the existence of occasional high frequency noise spikes when measuring the output voltage ripple on a SynQor converter and how these spikes are largely a measurement artifact. The paper details how to eliminate this measurement error with the proper test set-up and termination methods.

Paralleling Capabilities of SynQor Rack Mount System

This application note provides an overview of the paralleling capabilities of the SynQor Rack Mount System Products. It provides a table of all SynQor rack mount system products which indicates whether they can be paralleled and the type of paralleling method they use.

Paralleling Capability of SynQor Converter Modules

This describes the various paralleling methods used in SynQor converters. It provides a table of all SynQor power converter products which indicates whether they can be paralleled and the type of paralleling method they use. The table also lists whether external paralleling can be implemented if internal paralleling is not provided.

Start-Up into Capacitive Loads

This application note describes the start‑up characteristics of SynQor converters starting into loads below, near and above the output capacitance limits on the datasheet.

SynQor Series Operation

This application note describes how to connect isolated DC‑DC converters in series to create non‑standard voltages for the industrial market. Wiring diagrams and design considerations are provided for series operation of multiple DC‑DC converters.

Thermal Relief Study

This application note addresses concerns raised with regards to pin and board heating when high currents (>60A) are driven through thermally relieved plated through hole (PTH) vias. Detailed thermal analysis will show that internal heat generation and resulting temperature rise of the power converter and load board is minimal when using a single thermally relieved via.


This application note provides additional information on the features and performance of the 28 V VPX power supplies. Topology, operation, efficiency and compliance to MIL‑STD‑461F, MIL‑STD‑704 and MIL‑STD‑1275 are discussed in detail.