Texas Instruments TPS40090EVM-002 manual Dynamic Warnings and Restrictions

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DYNAMIC WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 0 Vdc to100 Vdc.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 50°C. The EVM is designed to operate properly with certain components above 50°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Copyright 2004, Texas Instruments Incorporated

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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 SetupOverall Efficiency Output Current Efficiency and Power LossTotal Power Loss Output Current Test Results and Performance DataGain and Phase Oscillator Frequency Closed-Loop PerformanceOutput Ripple and Noise 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