Voltage Latch-Up | Agilent Technologies AN 372-1 instruction

To fully characterize the start-up sequence of the power supply under test, measurements must be made of the output voltage response to the instan- taneous application of the AC input (see Figure 11). A digital oscilloscope should be used so that stor- age of the output values can be accomplished for the measured start-up time period. To accurately

control the AC input frequency and amplitude to the power supply under test, a regulated AC source should be used. Turn-on of the AC source at selected 60 Hz (50 Hz) phases (zero-crossing and positive or negative peak voltage, for example) is important for thorough characterization of start-up. The electronic load used in this test should operate in CR mode.

Figure 10. Voltage Latch-Up

Undesirable voltage latch-up and turn-on can cause the power supply to operate at current levels that may be damaging to internal circuitry.

Figure 11. Start-Up Delay Test Configurations and Results

AN 372-1 specifications

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