DN030 - Powering FPGAs Using Digitally Controlled Point of Load Converters

Field Programmable Gate Arrays (FPGAs) require several high quality power supply lines. Designers experience several challenges when designing FPGA power solutions which are elaborated in this design document. All of these challenges are much easier to accommodate when using digital power technology. Moreover, using digitally-controlled DC/DC converters dramatically reduces the time taken to design the FPGA’s power supply system.

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DN029 - Conducted EMC Filters for Flex Board Mounted Power Supplies

This design note is intended to alleviate confusion regarding EMC requirements by showing how Flex board mounted power supplies, BMPS, can be easily integrated into a wide range of electronic systems while meeting the system level EMC requirements.

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DN028 - Thermal Characterization of Board Mounted Power Supplies in Sealed Box Applications

This design note describes the thermal performance of board mounted power supplies when used in applications with no or limited convection cooling. In these conditions, often referred to as ‘sealed box’ applications, the main part of the power losses is dissipated by conduction through the power supply’s baseplate coupled to a large thermal mass (cold wall).

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DN027 - Test Methods for DC/DC Power Modules

This design note addresses techniques and considerations for accomplishing such testing, and should be used in conjunction with the Technical Specification for the particular product being evaluated as well as other Flex design notes that will be referenced. Contents include precautions that should be kept in mind when testing DC/DC power modules, the appropriate test setup and test equipment, and a procedural outline for performing many of the most common types of tests. By following the guidelines presented here, valid test results that may be compared to the parameters listed in the product Technical Specification will be obtained.

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DN025 - Forced Air Cooling of DC/DC Power Modules at High Altitude

Due to lower air density at higher elevations, the convective heat transfer capabilities of air can vary depending on elevation. For uncontrolled environment this adverse effect is offset by a lower ambient temperature at higher elevations. This Design Note will focus on the relationship between air convective heat transfer and elevation. This should be considered within the context of cooling DC/DC converters and their associated thermal derating curves.

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DN024 - DC/DC Power Modules Basics

This design note covers basic considerations for the use of on-board switch mode DC/DC power modules, also commonly known as BMPS, i.e. board mounted power supplies.

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DN023 - Selection of Architecture for Systems Using Bus Converters and POL Converters

Most telecom and datacom systems now contain integrated high performance processors, ASICs and FPGAs. These systems are characterized by high levels of current demand at multiple low supply voltages, tight regulation requirements, large and fast dynamic currents. This environment leads to the utilization of some type of distributed power architecture (DPA) to supply operating voltages to these circuits rather than using centralized power architecture.

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DN022 - Output Ripple and Noise Measurement Methods for Flex Power Modules

There is no industry-wide standard for measuring output ripple and noise in DC/DC converters. The methods and test setups vary from supplier to supplier, which sometimes can cause confusion. Flex uses methods that give meaningful and reproducible results to the user, but the test methods and assumptions used are not the same for all series of Flex products due to the wide range of power levels and end-use applications.

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DN021 - On/Off Control Using the Remote Control (RC) pin on Flex Power Modules

Most DC/DC converters throughout the industry offer some type of remote control function to enable the converter to be turned on or off by means of an external control signal. While some degree of standardization exists between converter suppliers, the standardization is far from complete.

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DN019 - Thermal Characterization of Flex Power Modules

The latest power modules feature extremely compact form factors and high efficiency operation. The high packaging density is accomplished by using materials with excellent thermal properties in conjunction with extensive attention to the details of thermal design.

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DN015 - 48V On/Off Control Using Remote Control (RC) Pin 

In some applications it is necessary to have a precise turn on and turn off level. The example used in this note is useful for setting turn on and turn off in the range of 36-75 V.

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DN014 - Voltage Monitor Circuit Configuration

In some applications it is necessary to monitor the output voltages and shut down all converters if any of these fails. The examples in this design note shows how to monitor two outputs.

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DN013 - On/Off Control Using Remote Control (RC) Pin

In some applications it is necessary to have a precise turn on and turn off level.

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DN012 - Output Overvoltage Protection with Latching Function

This design note shows how to use the Remote Control (RC) pin of an Flex DC/DC power module to stop the operation when there is an over voltage condition.

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DN007 - Output Voltage Alarm Circuit

This design note shows one example on how to detect output voltage and provide a status signal by using LED diodes.

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DN002 - Reliability Aspects on Power Supplies

As power supplies are the very heart of every electronic equipment, special attention must be paid to their reliability. For other electronics a certain failure mode, at least for a part of the total system, can often be tolerated without serious (critical) after-effects.

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