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LM25005 датащи(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM25005
подробное описание детали  42V, 2.5A STEP-DOWN SWITCHING REGULATOR
PDF  21 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM25005 датащи(HTML) 18 Page - National Semiconductor (TI)

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Application Information (Continued)
BIAS POWER DISSIPATION REDUCTION
Buck regulators operating with high input voltage can dissi-
pate an appreciable amount of power for the bias of the IC.
The V
CC regulator must step-down the input voltage VIN to a
nominal V
CC level of 7V. The large voltage drop across the
V
CC regulator translates into a large power dissipation within
the Vcc regulator. There are several techniques that can
significantly reduce this bias regulator power dissipation.
Figures 11 and 12 depict two methods to bias the IC from the
output voltage. In each case the internal Vcc regulator is
used to initially bias the VCC pin. After the output voltage is
established, the VCC pin potential is raised above the nomi-
nal 7V regulation level, which effectively disables the internal
V
CC regulator. The voltage applied to the VCC pin should
never exceed 14V. The V
CC voltage should never be larger
than the V
IN voltage.
20170018
FIGURE 11. VCC Bias from VOUT for 8V < VOUT < 14V
20170019
FIGURE 12. VCC Bias with Additional Winding on the Output Inductor
www.national.com
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