Datasheet

LM2599
www.ti.com SNVS123C –APRIL 1998–REVISED APRIL 2013
If the part is operated with an input voltage at or below the internal soft-start clamp voltage of approximately 7V,
the voltage on the SD/SS pin tracks the input voltage and can be disturbed by a step in the voltage. To maintain
proper function under these conditions, it is strongly recommended that the SD/SS pin be clamped externally
between the 3V maximum soft-start threshold and the 4.5V minimum input voltage. Figure 31 is an example of
an external 3.7V (approx.) clamp that prevents a line-step related glitch but does not interfere with the soft-start
behavior of the device.
Figure 29. Soft-start, Delay, Error, Output
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