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A5974AD датащи(PDF) 37 Page - STMicroelectronics

номер детали A5974AD
подробное описание детали  Zero load current operation
PDF  49 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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A5974AD датащи(HTML) 37 Page - STMicroelectronics

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A5974AD
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Doc ID 018762 Rev 1
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Figure 25.
Positive buck-boost regulator
8.7
Negative buck-boost regulator
In Figure 26, the schematic circuit for a standard buck-boost topology is shown. The output
voltage is:
Equation 38
where the ideal duty cycle D for the buck-boost converter is:
Equation 39
The considerations given in Section 8.7 for the real duty cycle are still valid here. Also
Equation 35 to 37 can be used to calculate the maximum output current. So, for example,
considering the conversion VIN = 12 V to VOUT = -5 V, ILOAD = 0.5 A:
Equation 40
Equation 41
An important point 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).
AM09690v1
10V
A5974AD
4.7
6.8
6
470
ESR>35m
Ω
V
OUT
V
IN
–
D
1D
–
-------------
⋅
=
D
V
–
OUT
V
IN
V
OUT
–
------------------------------
=
D
5
512
+
----------------
0.706
==
I
SW
I
LOAD
1D
–
---------------
0.5
10.706
–
------------------------
1.7A
==
=



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