lm2599sx-5.0 National Semiconductor Corporation, lm2599sx-5.0 Datasheet - Page 26

• Manufacturer Part Number: lm2599sx-5.0
• Description: Simple Switcher Power Converter 150 Khz 3a Step-down Voltage Regulator, With Features
• Manufacturer: National Semiconductor Corporation

Application Information
(Continued)
DS012582-41
FIGURE 25. Output Voltage, Input Current,
at Start-Up, WITHOUT Soft-start
DS012582-40
FIGURE 24. Output Voltage, Input Current,
This reduction in start up current is useful in situations where
at Start-Up, WITH Soft-start
the input power source is limited in the amount of current it
can deliver. In some applications Soft-start can be used to
replace undervoltage lockout or delayed startup functions.
If a very slow output voltage ramp is desired, the Soft-start
capacitor can be made much larger. Many seconds or even
minutes are possible.
If only the shutdown feature is needed, the Soft-start capaci-
tor can be eliminated.
DS012582-42
FIGURE 26. Typical Circuit Using Shutdown /Soft-start and Error Flag Features
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