What is power supply slew rate and can it be programmed?

Slew rate is defined as rate of change of voltage or current in a period of time. It is a frequently used term in operational amplifier specifications, but it also applicable when discussing programmable power supplies.


Figure 1: Typical battery voltage profile for “cold crank”

When performing repetitive production testing on say a vehicle engine management system, many manufacturers will perform full function testing at multiple input voltages to simulate varying battery conditions. For an automobile that battery range is typically 9V to 16V, but may drop down to 3V when the engine is first started in cold ambient conditions (cold-crank). Figure 1 shows a typical battery voltage profile under that condition. continue reading »

Aug23

Introducing the KAS series of wide input range, 2 and 4W encapsulated AC-DC power supplies

Designed to meet the household requirements of IEC/EN 60335-1, the KAS series of wide input range AC-DC power supplies is suitable for both domestic and industrial applications. This video reviews the performance and applications of these encapsulated board mounted power supplies, which do not need a ground connection and are available in 2W or 4W power levels. The KAS series provides an off-load power consumption less than 0.3W and Class B EMC performance.

Click here to read more about the full range of AC-DC power supplies, or click here for the product page: www.uk.tdk-lambda.com/kas

If you have a question you’d like to ask TDK-Lambda, please feel free to use the online FAQ form and we’ll get back to you with an answer to your question as soon as possible.

Aug18

Low noise Modular power supply assists digital pathology

Digital pathology converts the delicate glass sample slides into digital slides through the use of scanning for electronic storage. This allows records to be permanently archived or analysis to be performed remotely by teams of dedicated, trained pathologists.

Electrical noise from the scanner power supply can reduce the clarity of images. Concerned about this, a manufacturer of pathology scanners approached TDK-Lambda for recommendations regarding a high power multiple output power supply. A sample of the new QM7 modular series was quickly shipped, and the customer was impressed by the low electrical (and acoustic) noise. The QM’s 7-year warranty was also a factor in their decision.

TDK-Lambda offers a wide range of standard and custom Medical & Scientific Power Supplies for healthcare applications – click for more information.

www.uk.tdk-lambda.com/qm7

Aug16

The benefits of using non-isolated DC-DC converters

The DC power requirement for electronic industrial equipment often consists of a 24V high power output and a number of lower power, lower voltages. Traditionally these requirements have been achieved by a number of power architectures, depending upon the amount of system power required.

For applications requiring low power, 300W or less, a standard multiple output power supply is usually selected. Dual, triple and quad versions can be purchased off-the-shelf at cost effective prices. Models with a wide combination of 5V, +/-12, +/-15V and 24V outputs are available.


NV700

For mid to high power requirements, 350W to 1500W, modular or configurable power supplies are often chosen. Here a high power 24V module can be selected and the desired combination of other voltages satisfied by single or dual output modules. These build-to-order power supplies are available with short lead-times as they are assembled using pre-built assemblies. TDK-Lambda’s NV, Vega or Alpha series are examples of these types of power supplies, featuring wide range adjustable outputs for non-standard voltages. For convenience all connections can be made to one package with integrated fan cooling. continue reading »

Aug11

Reducing Audible Noise from Power Supplies

Noise can be described as ‘unwanted sound’ and environmental noise is usually just part of normal everyday life. One source of such noise is that created by cooling fans on AC-DC power supplies.

The use of fans to cool electronic equipment has become increasingly widespread due to ongoing demands for miniaturisation. Convection cooling is ideal but usually increases the size of the product, and because air still needs to circulate around the product, there are restrictions. For example, additional derating is needed, and thermal hotspots can occur, leading to a reduction in component life, particularly with electrolytic capacitors. When convection cooled power supplies are used within a rack, there is often insufficient naturally circulated cooling air (a good rule of thumb is to allow 50mm space around the product to allow the hot air to rise and the cooler air to come in from the sides). continue reading »

Aug09

Introducing iFB 600W full brick DC-DC converters

This video reviews the performance and applications of the iFB series of DC-DC converters. Packaged in the industry standard full brick footprint, the iFB has operating efficiencies of up to 94%, operates over a 36-75Vdc input and is available with 9.6V or 12V outputs for driving non-isolated Point of Load DC-DC converters. Output adjustment is -40 to +10% of nominal and the units have an isolated remote on/off function.

Click here to read more about the full range of DC-DC converters, or click here for the product page: www.uk.tdk-lambda.com/ifb

If you have a question you’d like to ask TDK-Lambda, please feel free to use the online FAQ form and we’ll get back to you with an answer to your question as soon as possible.

Aug04

How does higher efficiency facilitate integration of PFE1000FA power modules?

The higher efficiency of the new PFE1000FA series of AC-DC power modules reduces dissipated power and has a direct impact on cooling requirements. With 1m/s airflow, heat sink size can be reduced by up to 47%.

System integration is made simpler with reduced airflow (resulting in lower audible noise), reduced heat sink size or allowing higher temperature operation.

Click here to read more about the full range of AC-DC power supplies, or click here for the product page: www.uk.tdk-lambda.com/pfe-sa

If you have a question you’d like to ask TDK-Lambda, please feel free to use the online FAQ form and we’ll get back to you with an answer to your question as soon as possible.

Aug02

Cost-effective, long operating life power supply chosen for use in catering equipment

RWS-B

Searching for a small, cost-effective power supply to provide power for a motorised deep fat fryer, designers of a new range of catering equipment chose a 300W, 24V output model from TDK-Lambda’s new RWS-B series. Measuring just 102 x 41 x 170mm, this industrial grade product has conservatively rated capacitors to ensure a 10-year field life and is backed by a 7-year warranty.

www.uk.tdk-lambda.com/rws-b

TDK-Lambda offers a wide range of Industrial AC-DC Power Supplies for industrial, test and measurement applications, click for more information

Jul28

What are the benefits of the new PFE1000FA AC-DC power modules?

Eight years ago the PFE1000F series of AC-DC power modules was introduced and has become an industry standard. Now the next generation PFE1000FA series has been launched utilising the latest components, resulting in operating efficiency enhancements, improved input harmonic currents and optimised construction for easier production. A five year warranty now applies to all PFE “A” modules.

Click here to read more about the full range of AC-DC power supplies, or click here for the product page: www.uk.tdk-lambda.com/pfe-sa

If you have a question you’d like to ask TDK-Lambda, please feel free to use the online FAQ form and we’ll get back to you with an answer to your question as soon as possible.

Jul26

Board mount 2 and 4W power supplies accept a 90 – 305Vac input

TDK Corporation announces the introduction of the KAS series of wide input range, 2 and 4W encapsulated AC-DC power supplies. They can operate continuously from 90 to 305Vac, 47-440Hz, making them ideal for use with 115V, 230V and 277Vac nominal inputs. Additionally, having a Class II construction, no earth ground connection is required. Input to output isolation is 3,000Vac; this makes the series ideally suited as a low power source for a large number of applications, including building automation, security, professional household equipment and systems requiring an additional standby voltage.

The KAS is available in 8 output voltages; 3.3, 5, 8, 9, 12, 14, 15 and 24V. Off-load power consumption is <0.3W. The encapsulated board mount power supplies are enclosed in a UL 94V-0 rated plastic resin fibreglass case for enhanced shock and vibration performance. The 2W and 4W models measure 28.5 x 25.8 x 17 mm and 37 x 27.5 x 17.5 mm respectively. The KAS2 models can operate convection cooled in ambient temperatures of -40 to +80°C, with de-rating above 60°C. The KAS4 operates from -40 to +70°C, with de-rating dependent upon output voltage. continue reading »

Jul24