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L5973D bảng dữ liệu(PDF) 12 Page - STMicroelectronics

tên linh kiện L5973D
Giải thích chi tiết về linh kiện  2.5 A switch step down switching regulator
PDF  17 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L5973D bảng dữ liệu(HTML) 12 Page - STMicroelectronics

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Application ideas
L5973D
12/17
When an output voltage below the internal reference (1.235 V) is required, the circuit
reported in the figure 18 can been used. In this case the minimum voltage reachable is 0.6 V
and can be easily calculated with the following formula:
VOUT = VFB - [(VREF - VFB)x(R2 / R1)]
If the load is not present, a resistor connected between VOUT and GND is required in order
to avoid that the voltage across COUT increases.
The value of this resistor has to be calculated taking into account that the current flowing
through this resistance has to be higher than the current flowing through R2.
Figure 19.
Output voltage below the 1.235 V internal voltage reference



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