Datasheet

Vin=200mV/div(accoupled)
PH=5V/div
Time=2usec/div
Vin=10V/div
Vout=2V/div
EN=2V/div
SS/TR=2V/div
Time=5msec/div
Test Setup and Results www.ti.com
2.8 Input Voltage Ripple
The TPS54260EVM-597 input voltage ripple is shown in Figure 8 . The output current is the rated full load
of 2.5 A and V
IN
= 12 V. The ripple voltage is measured directly across the input capacitors.
Figure 8. TPS54260EVM-597 Input Ripple
2.9 Powering Up
The start-up waveforms are shown in Figure 9. Start-up is relative to VIN rising. The input voltage is
initially applied, and when the input reaches the undervoltage lockout threshold, the start-up sequence
begins and the output ramps up at the externally set rate toward the set value of 3.3 V. The input voltage
for these plots is 12 V with a 2 Ω load.
Figure 9. TPS54260EVM-597 Start-Up Relative to V
IN
8
TPS54260EVM-597 2.5-A, SWIFT™ Regulator Evaluation Module SLVU372–March 2009
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