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L7987L Folha de dados(PDF) 35 Page - STMicroelectronics

Nome de Peças L7987L
Descrição Electrónicos  Adjustable current limitation
PDF  41 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7987L Folha de dados(HTML) 35 Page - STMicroelectronics

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L7987L
Application ideas
41
The current flowing through the internal power MOSFET is transferred to the load only
during the OFF time, so according to the maximum allowed L7987L DC switch current
(2.0 A), the maximum output current for the buck-boost topology can be calculated from
Equation 35.
Equation 35
where ISW is the average current in the embedded power MOSFET during the ON time.
In addition to these constraints, the thermal considerations summarized in Section 5.5 on
page 29 must also be evaluated.
Figure 24. Buck-boost PCB layout (top and bottom)
The transfer function of the power section for buck-boost topology is summarized below:
Equation 36
With below singularities and parameters:
Equation 37
A2
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1
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