TPS40020

TPS40021

SLUS535C − MARCH 2003 − REVISED SEPTEMBER 2004

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28

REFERENCE DESIGN

Transient Response and Output Ripple Voltage

voltage is about 35 mV.

Figures 33 and 34 show the transient waveform with and without the transient comparator. Using the transient

comparator yields a settling time of 10-

µs faster than without.

0 A to 13 A, the overshoot voltage is approximately 80 mV, and the undershoot is is approximately 60 mV as

shown in Figure 35. When the transient comparator is triggered, the powergood (PWRGD) signal goes low.

t − Time − 200

µs/div

VOUTac (50 mV/div)

IOUT (10 A/div)

Figure 33. Transient Response Undershoot

t − Time − 10

µs/div

VIN = 3.3 V

IOUT (10 A/div)

WIth Transient

Comparator

WIthout Transient

Comparator

Figure 34. Transient Response Overshoot

t − Time − 10

µs/div

VIN = 3.3 V

IOUT (10 A/div)

WIth Transient

Comparator

WIthout Transient

Comparator