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Texas Instruments TPS40090EVM-002 manual Transient Response

Models: TPS40090EVM-002

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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-mΩ resistors placed on the board. The slew rates of the transient are 200 A/µs for the load step-down and 160 A/µs 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 µs.

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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Texas Instruments TPS40090EVM-002 manual Transient Response

Contents

User’s Guide Using the TPS40090EVM-002User’s Guide EVM IMPORTANT NOTICE DYNAMIC WARNINGS AND RESTRICTIONS Contents 1 Introduction 2 Features 3 Schematic 4 Component Selection Systems Power5 Test Setup 6 Test Results/Performance Data 7 Layout Considerations 8 EVM Assembly Drawing and PCB Layout 9 List of MaterialsSchematic FeaturesTable 1. TPS40090EVM−002 Performance Summary SLUU195 − JuneTRANSEN SLUU195 − June4.1 Frequency of Operation 4 Component SelectionIOUT 4.2 Inductance Value4.3 Input Capacitor Selection k N PH, D + if N PH v 1, DI OUTD, DI OUT N PH, D 4.4 Output Ripple Cancellation and Capacitor SelectionK N PH, D + Figure 5. Output Ripple Current Cancellation0.6mH 4.5 MOSFET Selection4.6 Current Sensing 4.7 Overcurrent Limit Protection 2p R11 C11 4.8 Compensation Components+ 354 kHz Figure 7. Connections for the Test 5 Test Setup6 Test Results and Performance Data 6.1 Efficiency and Power Loss6.3 Output Ripple and Noise 6.2 Closed-Loop PerformanceFigure 10. Bode Plot Figure 11. Output NoiseFigure 12. Transient Response 6.4 Transient ResponseFigure 14. J11 Open Circuit 6.5 Start up with Pre-Biased OutputFigure 13. J11 Short Circuit 7 Layout Considerations SLUU195 − June 8 EVM Assembly Drawing and PCB LayoutFigure 15. Top Side Component Assembly Figure 16. Bottom Assembly SLUU195 − June Figure 17. Top Side Copper Figure 18. Internal 1 Ground PlaneSLUU195 − June Figure 19. Internal 2 Power Plane Figure 20. InternalSLUU195 − June Figure 21. Internal Figure 22. Bottom Layer CopperSLUU195 − June 9 List of MaterialsTable 2. List of Materials Reference SLUU195 − JuneDescription SizeApplications IMPORTANT NOTICEProducts