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Figure 3-2. Tracking with an External Ramp for 3.3-V Output
3.4 Output Voltage Ripple
Output voltage ripple measurement should be taken directly across the output capacitor C21 or C22. Care has to
be taken to minimize the loop area between the scope probe tip and the ground lead in order to minimize noise
in the measurement. This can be achieved by removing the spring tip of the probe and ground lead and then
wire a bare wire around the scope probe shaft. The bare wire should be in contact with the probe shaft because
this is the "new" ground lead for the probe. The measurement can be taken by connecting the bare wire onto the
ground side of the capacitor and the probe tip onto the other side of the capacitor.
this measurement technique.
SNVA389B – JULY 2009 – REVISED FEBRUARY 2022
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Figure 3-3. Output Voltage Ripple Measurement Setup
Copyright © 2022 Texas Instruments Incorporated
Figure 3-3
shows a diagram of
LM3000 Buck Controller Evaluation Module User's Guide
Board Configuration
5
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