Texas Instruments TPS40090EVM-002 manual Transient Response

SLUU195 − June 2004

6.4Transient Response

The on-board load transient circuit enables to check the step load transient response on the

same board. Simply by putting a jumper to connect Pin1 and 2 of J3, a 90-A step load is created by three 50-mΩresistors placed on the board. The slew rates of the transient are 200 A/∝s for the load step-down and 160 A/∝s for the load step-up.

The transient response is shown in Figure 6 as the load is stepped from 10 to 100 A. The output deviation is approximately 200 mV and the settling time is within 15 ∝s.

Load Step = 90 A

Something Voltage

(10 mV/div)

Something Voltage

(10 mV/div)

t − Time − 20 ∝s / div

Figure 12. Transient Response

TPS40090 Multi-Phase Buck Converter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A 17