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Technical Documents

Application Notes

ACuQor Hi-Pot 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.

Series Operation of SynQor Converters - 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.

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.

Mil-COTS 270V Full Feature - This application note explains how to implement the features of a Full Featured Mil-COTS 270V converter. Features include active current sharing, clock synchronization, and start-up synchronization. These items are explained in detail and layout suggestions and wiring schemes are presented.

InQor Railway - This application note details the InQor product line and its use in the railway industry and also addresses the European standards EN50155 and RIA12 and how to meet them using the InQor dc-dc converters.

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.

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.

Output Load Current Calculations - 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.

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.

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.

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.

Aqueous Cleaning and Soldering Considerations - This Application Note provides an overview of Aqueous Cleaning and Soldering Considerations for SynQor Open-Frame, Fully Encased, and Base-Plated Products.

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"A Two-Stage Approach to Highly Efficient, Super-Wide Input Voltage Range DC-DC Converters" - This paper details a two-stage approach to dc/dc converter design that increases the input voltage range without sacrificing efficiency for applications that require a wide input range or have significant transient or voltage surges.

"Defining an Intelligent Pin-Out for High Amperage DC/DC Converters" - This paper describes a pin-out design for high amperage converters (60+ Amps) that require two sets of output pins. The design minimizes voltage drop and power dissipation, resulting in an optimal solution for the customer.

"High Efficiency Pays" - This paper explores the substantial cost savings associated with using a high-efficiency DC/DC converter. These savings include reduced electricity consumption, smaller requirements for ac/dc power supply and battery backup as well as less need for fans, cooling systems and real estate.

Savings Calculator - download this file to input your own DC/DC converter values and cost assumptions that are outlined in the "High Efficiency Pays" white paper. This spreadsheet allows easy customization of the savings analysis to fit your specific conditions.

"Overview of Kilo, Mega, Giga, Tera DC/DC Converters" - This paper details the product's performance improvements and technical differences while answering common questions about compatibility and part number changes within the Power Qor family of DC/DC converter modules.

"Discover a New World without Baseplates" - This paper demonstrates the performance and reliability advantages of using a DC/DC converter that is constructed with no baseplate.

"Get the Heatsink off your Back" - This paper demonstrates how synchronous rectifier based DC/DC converters provide more usable output power without a heatsink than do the conventional, Schottky diode based converters with a heatsink. -German Version-

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Design Tools

Trim Resistor Calculator - This spreadsheet tool allows you to calculate proper resistor values for trimming up or down on all SynQor converters. The tool allows the user to select the part number, trim direction and desired output voltage. It then calculates the resistor value, tells where to connect the resistor and also indicates if the desired voltage is beyond the specified range of the converter.

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Engineering Change Notices

Quarter-Brick Trim Equations - This notice details the new Tyco (Lucent) compatible quarter-brick trim equations that took effect in January 2001.

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Evaluation Board Information

Evaluation Board Procedure Document - This document will guide you through the evaluation process to fully qualify any PowerQor or DualQor modules.

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Accessories

The following documents are the mechanical drawings for a series of assemblies that SynQor offers for the customer's convenience.

    · AQ-CBL-INPUT1C - Input mating cable with pre-stripped wire ends (36" long).
    · AQ-CBL-OUT1C - Output mating cable with pre-stripped wire ends (18" long).
    · AQ-CBL-OUT2C - Output mating cable with connectors on both ends (18" long).

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