Contents
What is PSU stability?
As mentioned earlier, the stability of a power supply should be measured under all operating conditions. A power supply may be stable under some conditions while unstable under others. That is why it is best to produce all operating extremes, including maximum and minimum output impedance and input voltages.
What are PSU parameters?
Then, there are operating parameters that describe a power supply’s performance, like drift, dynamic response, line regulation, load regulation, etc. Efficiency determines the thermal and electrical losses in the system, as well as the amount of cooling required.
What is power supply phase margin?
The previous articles in this series have shown how to make successful frequency response measurements on power supplies, including loop gain. At the crossover frequency, where the gain crosses 0 dB, we measure how many degrees the phase is above -180 degrees. This measurement is defined as the phase margin.
What is power supply range?
Power supplies are generally rated for either 0 to 55°C or -20 to 71°C ranges. But current ratings for most power supplies are based on a 55°C maximum ambient. Current ratings for higher temperatures are derated from those for 55°C.
How is the stability of a power supply determined?
The negative feedback term of a power supply must be sufficiently out of phase with the input or establish a gain of less than one to ensure proper operation. The traditional method of ensuring stability in a closed feedback circuit is to measure and plot the gain and phase for the complete path around the loop.
How is stability measured in a feedback circuit?
The traditional method of ensuring stability in a closed feedback circuit is to measure and plot the gain and phase for the complete path around the loop. From this measurement a safety margin can be calculated and determined if it is acceptable for the system under test. Phase and gain margin will be expanded upon below.
Which is the basic principle of stability measurement?
1. Basic Principle of Stability Measurement A regulated power supply is actually a feedback amplifier with a large amount of current sourcing capability. Any theory that applies to a basic feedback amplifier also applies to a regulated power supply.
Which is siglent oscilloscope for power supply stability?
Traditionally, stability measurements require expensive frequency response analyzers (FRA) which are not always available in a laboratory. SIGLENT has released Bode Plot Ⅱ features to the SIGLENT SDS1104X-E, SDS1204X-E, SDS2000X-E, SDS2000X Plus, and SDS5000X series of oscilloscopes.