20 ms/div

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Test Results

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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