Texas Instruments TPS53316EVM-075, Руководство пользователя

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Test Procedure
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7 Test Procedure
7.1 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up EVM as described in Section 5 and Figure 3 .
2. Ensure load is set to constant resistance mode and to sink 0 A
DC
.
3. Ensure all jumpers set per Section 6 .
4. Increase VIN from 0 V to 5 V. Using V1 to measure VIN voltage.
5. Open jumper J4 to enable the controller.
6. Use V2 to measure VOUT voltage, A1 to measure VIN current.
7. Vary Load from 0 A
DC
to 5 A
DC
, VOUT should remain in load regulation.
8. Vary VIN from 2.9 V to 6.0 V, VOUT should remain in line regulation.
9. Short jumper J4 to disable the controller.
10. Decrease Load to 0 A.
11. Decrease VIN to 0 V.
7.2 Control Loop Gain and Phase Measurement Procedure
TPS53316EVM-075 contains a 10- Ω series resistor in the feedback loop for loop response analysis.
1. Set up EVM as described in Section 5 and Figure 3 .
2. Connect isolation transformer to test points marked TP1 and TP2.
3. Connect input signal amplitude measurement probe (channel A) to TP1. Connect output signal
amplitude measurement probe (channel B) to TP2.
4. Connect ground lead of channel A and channel B to TP5.
5. Inject around 20-mV or less signal through the isolation transformer.
6. Sweep the frequency from 500 Hz to 500 kHz with 10-Hz or lower post filter. The control loop gain and
phase margin can be measured.
7. Disconnect isolation transformer from bode plot test points before making other measurements (signal
injection into feedback may interfere with accuracy of other measurements).
8 5-A Step-Down Regulator with Integrated Switcher SLUU671 – December 2011
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