Designing for Very Fast Load Transients

PTH12060W/L

www.ti.com .................................................................................................................................................... SLTS217H – MAY 2003 – REVISED DECEMBER 2008

The transient response of the dc/dc converter is characterized using a load transient with a di/dt of 1 A/µs. The

typical voltage deviation for this load transient is given in the data sheet specification table using the optional

value of output capacitance. As the di/dt of a transient is increased, the response of a converter's regulation

circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with any dc/dc

converter once the speed of the transient exceeds its bandwidth capability. If the target application specifies a

higher di/dt or lower voltage deviation, the requirement is met with additional output capacitor decoupling. In

these cases, special attention must be paid to the type, value, and ESR of the capacitors selected.

If the transient performance requirements exceed that specified in this data sheet, or the total amount of load

capacitance is above 3,000 µF, the selection of output capacitors becomes more important.

Copyright © 2003–2008, Texas Instruments Incorporated

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