551011367-021 National Semiconductor, 551011367-021 Datasheet - Page 26

• Manufacturer Part Number: 551011367-021
• Description: BOARD WEBENCH BUILD IT LM2599
• Manufacturer: National Semiconductor
• Series: WEBENCH® Buildit Boardr

Specifications of 551011367-021

• Main Purpose: DC/DC, Step Down
• Regulator Topology: Buck
• Board Type: Bare (Unpopulated)
• Utilized Ic / Part: LM2599
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Current - Output: -
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -
• Frequency - Switching: -
• Outputs And Type: -
• Other names: *551011367-021

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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