Texas Instruments TPS40090EVM-002 manual Transient Response

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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

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Contents User’s Guide EVM Important Notice Dynamic Warnings and Restrictions Introduction Schematic FeaturesTransen Frequency of Operation Component SelectionInput Capacitor Selection Inductance ValuePH, D + if N PH v 1, DI OUTD, DI OUT N PH, D Output Ripple Cancellation and Capacitor SelectionIripple + L VoutCurrent Sensing Mosfet SelectionOUT Overcurrent Limit ProtectionR11 Compensation ComponentsConnections for the Test Test SetupTotal Power Loss Output Current Efficiency and Power LossTest Results and Performance Data Overall Efficiency Output CurrentOutput Ripple and Noise Gain and Phase Oscillator FrequencyClosed-Loop Performance Transient Response Transient ResponseJ11 Short Circuit Start up with Pre-Biased OutputLayout Considerations Top Side Component Assembly EVM Assembly Drawing and PCB LayoutTop Side Copper Internal 2 Power Plane Bottom Layer Copper QTY List of MaterialsLoad Transient Circuit Products Applications Important Notice
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