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LM5574MT/NOPB bảng dữ liệu(PDF) 18 Page - Texas Instruments

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tên linh kiện LM5574MT/NOPB
Giải thích chi tiết về linh kiện  LM5574/LM5574-Q1 SIMPLE SWITCHER짰 75V, 0.5A Step-Down Switching Regulator
PDF  29 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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LM5574MT/NOPB bảng dữ liệu(HTML) 18 Page - Texas Instruments

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BST
SW
VCC
IS
GND
LM5574
COUT
D1
L1
D2
V
OUT
BST
SW
VCC
IS
GND
LM5574
VOUT
D2
D1
L1
COUT
LM5574, LM5574-Q1
SNVS478F – JANUARY 2007 – REVISED APRIL 2013
www.ti.com
BIAS POWER DISSIPATION REDUCTION
Buck regulators operating with high input voltage can dissipate an appreciable amount of power for the bias of
the IC. The VCC regulator must step-down the input voltage VIN to a nominal VCC level of 7V. The large voltage
drop across the VCC regulator translates into a large power dissipation within the Vcc regulator. There are several
techniques that can significantly reduce this bias regulator power dissipation. Figure 20 and Figure 21 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 nominal 7V regulation
level, which effectively disables the internal VCC regulator. The voltage applied to the VCC pin should never
exceed 14V. The VCC voltage should never be larger than the VIN voltage.
Figure 20. VCC Bias from VOUT for 8V < VOUT < 14V
Figure 21. VCC Bias with Additional Winding on the Output Inductor
18
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Product Folder Links: LM5574 LM5574-Q1



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