Vin_ac

Vsw

Vout

Time - 200 ns/div

Waveforms

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ramped up over 3 ms. Figure 6 is a hot plug power up. The output ramp rate is the same in both

figures due to the controlled soft-start. The output can be programmed to track another voltage by use

of the soft-start pin. See the data sheet for more details.

8. Move CH1 to JP1-2 (Enable pin), and set JP1 shunt to off. Arm the scope and remove JP1 shunt.

Figure 7 shows the power-up of the converter via the enable pin.

9. Set the scope trigger to negative, arm the oscilloscope, and apply a shunt on JP1-OFF. See Figure 8

for the power-down sequence.

10. With an understanding of the basic functions of the EVM, users may want to integrate the EVM into

their system using short, twisted wires, to minimize connection impedances.

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Waveforms

4.5V input, 1.8V output, 1.4MHz Switching; CH1: Input Ripple, CH2: Switching Node, CH3: Output Ripple

Figure 2. Typical Switching Waveforms

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TPS62090EVM-063 Evaluation Module

SLVU670A – March 2012 – Revised May 2012

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