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LM2599 датащи(PDF) 19 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM2599
подробное описание детали  SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
PDF  31 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2599 датащи(HTML) 19 Page - National Semiconductor (TI)

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Application Information (Continued)
the narrow pulses and ramp up in a controlled manner. This
is a very useful feature in some switcher topologies that re-
quire large startup currents (such as the inverting configura-
tion) which can load down the input power supply.
Note: The lower curve shown in
Figure 13 shows the Soft-start region from
0% to 100%. This is not the duty cycle percentage, but the output volt-
age percentage. Also, the Soft-start voltage range has a negative tem-
perature coefficient associated with it. See the Soft-start curve in the
electrical characteristics section.
4. Normal operation. Above 2.8V, the circuit operates as a
standard Pulse Width Modulated switching regulator. The
capacitor will continue to charge up until it reaches the inter-
nal clamp voltage of approximately 7V. If this pin is driven
from a voltage source, the current must be limited to about
1 mA.
DS012582-31
FIGURE 13. Soft-start, Delay, Error, Output
DS012582-32
FIGURE 14. Timing Diagram for 5V Output
www.national.com
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