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LM2599 bảng dữ liệu(PDF) 19 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LM2599
Giải thích chi tiết về linh kiện  SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
PDF  31 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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LM2599 bảng dữ liệu(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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