Texas Instruments TPS62840-1YBGEVM56, Руководство пользователя

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Cut trace
as shown
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Introduction
3 SLUUC17 – May 2019
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TPS62840-1YBGEVM56 User's Guide
1.2.3 Loop Response Measurement
The loop response of the EVM can be measured with two simple changes to the circuitry. First, cut the
trace between the VOS pin and the output capacitor on the top layer. This change is shown in
Figure 1 .
Second, install a 10- Ω resistor across the resistor pads on the back of the PCB at Rx2. The pads are
spaced to allow installation of an 0603-sized resistor. With these changes, an ac signal (10-mV, peak-to-
peak amplitude recommended) can be injected into the control loop across the added resistor. Details of
measuring the control loop of DCS-Control devices are found in
How to Measure the Control Loop of
DCS-Control™ Devices . The results of this test are shown in Figure 3 .
Figure 1. Loop Response Measurement Modification