Texas Instruments TPS62737, Руководство пользователя

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VM
#2
CM
#2
VM
#1
CM
#1
<=5V
Power
Supply
Resistive or
CC Load
+
-
+
-
-
+
+ -
Optional
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Test Summary
Table 1 and Figure 2 show the test setup for measuring efficiency.
Figure 2. EVM Test Setup for Measuring Efficiency
3.3 Tips when Measuring Efficiency
1. Ensure that the EVM setup is according to Table 1 and Figure 2 , and preset the power supply to a
voltage less than 5.5 V at a current limit of approximately 400 mA.
2. Slowly increase the system load current until 200 mA is reached.
3. The TPS62737 datasheet has efficiency plots at various input voltages, output voltages and load
currents.
3.4 Tips for Taking Scope Plots
1. A current loop was inserted in series with the inductor for taking the inductor current measurements.
2. If measuring DC waveforms, set the timebase as shown in the plot and connect the probes to the
applicable headers (IN, OUT, VBAT_OK) or SW pin and the closest GND header.
3. If measuring AC waveforms such as output voltage ripple, set the timebase as shown in the plot,
remove the voltage probe hat, connect the probe tip to the top of capacitor C3 and a short ground lead
to capacitor C3's ground.
4. Please note that when measuring switching waveforms, the timebase may need to be adjusted as the
output load current adjusts due to the hysteretic control methodology.
5 SLVU939A – July 2013 – Revised August 2014 Evaluation Module for TPS62737 Ultra Low Power Buck Converter
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