TPS54340_15 Datasheet, PDF (17/44 Pages) Texas Instruments – TPS54340 42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™

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Feature Description (continued)
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Figure 27. Plot of Synchronizing in CCM
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TPS54340
SLVSBK0B – OCTOBER 2012 – REVISED MARCH 2014
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Figure 28. Plot of Synchronizing in DCM
Figure 29. Plot of Synchronizing in Eco-Mode
8.3.12 Overvoltage Protection
The TPS54340 incorporates an output overvoltage protection (OVP) circuit to minimize voltage overshoot when
recovering from output fault conditions or strong unload transients in designs with low output capacitance. For
example, when the power supply output is overloaded the error amplifier compares the actual output voltage to
the internal reference voltage. If the FB terminal voltage is lower than the internal reference voltage for a
considerable time, the output of the error amplifier will increase to a maximum voltage corresponding to the peak
current limit threshold. When the overload condition is removed, the regulator output rises and the error amplifier
output transitions to the normal operating level. In some applications, the power supply output voltage can
increase faster than the response of the error amplifier output resulting in an output overshoot.
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