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R5972D датащи(PDF) 27 Page - STMicroelectronics

номер детали R5972D
подробное описание детали  Up to 1.5 A step-down switching regulator for aerospace applications
PDF  35 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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R5972D датащи(HTML) 27 Page - STMicroelectronics

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R5972D
Application information
35
Figure 16. Positive buck-boost regulator
8.6
Negative buck-boost regulator
In Figure 17 the schematic circuit for a standard buck-boost topology is shown. The output
voltage is:
Equation 37
where the ideal duty cycle D for the buck boost converter is:
Equation 38
The considerations given in Section 8.5 for the real duty cycle are still valid here.
Also the Equation 34 till Equation 36 can be used to calculate the maximum output current.
So, as an example, considering the conversion VIN = 12 V to VOUT = -5 V, ILOAD = 0.2 A:
Equation 39
Equation 40
An important thing to take into account is that the ground pin of the device is connected to
the negative output voltage. Therefore, the device is subjected to a voltage equal to
VIN - VO, which must be lower than 36 V (the maximum operating input voltage).
VOUT
VIN
–
D
1D
–
-------------
=
D
V
– OUT
VIN VOUT
–
------------------------------
=
D
5
512
+
----------------
0.706
==
ISW
ILOAD
1D
–
---------------
0.2
10.706
–
------------------------
0.7A
==
=



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