Related Manuals for Agilent Technologies AN 372-1
Summary of Contents for Agilent Technologies AN 372-1
- Page 1 Agilent AN 372-1 Power Supply Testing Application Note An electronic load offers a broad range of operating modes, providing versatile loading configurations needed for characterizing and verifying DC power supply design specifications.
- Page 2 Introduction As regulated-power supply technology evolves, they are relatively inefficient when compared to testing methods for design verification and product switching power supplies, and tend to be large function require more sophisticated electronic equip- and heavy due to the heat sinks required to contin- ment.
- Page 3 An Overview of Power Supply Testing Needs Power supplies are used in a wide variety of prod- The tests covered in the following section are con- ucts and test systems. As a result, the tests per- figured with standard instrumentation: electronic formed to determine operating specifications can loads, digital oscilloscopes, digital multimeters, differ from manufacturer to manufacturer, or from...
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Page 4: Power Supply Tests
Power Supply Tests Table 2 Load Transient Current Limit Efficiency and Recovery Time Load Effect Characterization PARD Power Factor Start-Up ≤15 µs Electronic Load 1% programming 1% programming 1% programming 1% programming 1% programming rise accuracy accuracy accuracy accuracy accuracy Trigger output to CC or CR mode CR or CC mode... - Page 5 For a step change in load current, a marginally used in this test should have a risetime at least stable CV power supply will have a ringing voltage five times faster than the power supply under test, output. This defeats the purpose of the power sup- and should be able to operate in CC mode (or CR ply’s regulation circuitry and can be damaging mode) up to the maximum current rating of the...
- Page 6 Load Effect (Load Regulation) For multiple output CV power supplies, cross load effect is determined. This is an extension of Load Effect or Load Regulation is a static perform- the load effect test for a single output power sup- ance measurement which defines the ability of a ply, and determines the ability of all outputs of a power supply under test to remain within specified CV power supply to remain within their specified...
- Page 7 Current Limit Characterization Test Overview/ Procedures A measurement of the output voltage and current Current limit measurements demonstrate the degree of the power supply under test is required while to which a constant voltage power supply limits its decrementing the electronic load resistance (or maximum output current to a preset value.
- Page 8 PARD (Periodic and Random Deviation) some applications, a low output ripple specifica- tion is critical. An example would be where the PARD (formerly known as ripple and noise) is the power supply is providing power to a high gain periodic and random deviation of the DC output amplifier with inadequate ripple rejection for the voltage from its average value, over a specified application.
- Page 9 Test Overview/Procedures The first set of PARD measurements should be made with the AC source voltage and frequency To make PARD measurements, the electronic load used should operate in CR mode for constant volt- set at the lowest specified values, and with the age and constant current power supplies.
- Page 10 Efficiency Start-Up The efficiency of a power supply is simply the The start-up delay of a power supply is the amount ratio of its total output power to its total input of time between the application of AC input and power.
- Page 11 To fully characterize the start-up sequence of the control the AC input frequency and amplitude to power supply under test, measurements must be the power supply under test, a regulated AC source made of the output voltage response to the instan- should be used.
- Page 12 Other Power Supply Tests An observation of any DC power supply data sheet Short Circuit Output Current from a power supply manufacturer reveals a number This test measures the steady-state current of the of design specifications that must be verified and power supply under test after the output terminals tested.
- Page 13 Power Supply Testing with Agilent Electronic Loads The Agilent Electronic Load Family offers the power For testing multiple output power supplies, Agilent supply tester the solution for many of the tests that offers the 6050A 1800 Watt Load Mainframe. This must be performed.
- Page 14 (tel) 0 800 738 378 (fax) (64 4) 495 8950 Asia Pacific: (tel) (852) 3197 7777 (fax) (852) 2506 9284 Product specifications and descriptions in this document subject to change without notice. Copyright © 1988, 2000 Agilent Technologies Printed in U.S.A. 10/00 5952-4190...