Texas Instruments TPS92520EVM-133, User Manual

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6.4 GUI Devices Window
The device command window will not do any reads of the device until the En 520 No WD button has been
selected and the watch dog timer has been disabled, see Figure 6-13 .
Figure 6-13. Device Command Window
Once the En 520 No WD has been selected, the GUI will perform an initial read of all the registers and load the
information into the device command window, shown in Figure 6-14 . Note that SHORT , BSTUV , and STATUS
are flagged red because those faults conditions have occurred. The SHORT fault condition occurs because the
output is off and no current is driving the LEDs and the voltage at the output is less than 2.45 V on the CSP pin,
which indicates a
SHORT condition. BSTUV fault indicates that the bootstrap supply is lower than 2.95 V, which
is correct because the booststrap voltage is created when the output is turned on and the switch node is pulled
to ground to charge the booststrap capacitor to drive the high-side FET.
STATUS fault indicates that a fault has
occurred and is the logic OR of the fault bits for that channel.
TPS92520EVM-133 Power UP and Operation www.ti.com
42 TPS92520EVM-133 Dual 1.6-A Synchronous Buck LED Driver Evaluation
Module SLUUCC4 – OCTOBER 2020
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