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20 ms/div
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Figure 5 shows the LDO output voltage turn-on of TPS54120 from SW enable for the TPS54120EVM with
Vin = 12V, SW OUT = 4.1V, LDO OUT = 3.3V, and Iout = 400mA, Fswitching = 480kHz.
Figure 5. LDO Output Voltage Turn-on, SW Enable
4.4 Load Transient
Figure 6 shows the TPS54120 response to load transients. The current step is from 30% to 75% of the
maximum rated load at 12 V input. Total peak-to-peak voltage variation is as shown, including ripple and
noise on the output of both the switcher and the LDO.
Figure 6. TPS54120 Transient Response
7
SLVU641– January 2012 TPS54120EVM, Low Noise 1A Power Supply Evaluation Module
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