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R7986ATR Scheda tecnica(PDF) 33 Page - STMicroelectronics

Il numero della parte R7986ATR
Spiegazioni elettronici  3 A step-down switching regulator for aerospace applications
PDF  37 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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R7986ATR Scheda tecnica(HTML) 33 Page - STMicroelectronics

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R7986A
Application ideas
37
As in the positive buck-boost, the maximum output current according to application
conditions is shown in Figure 21. The dashed line considers a more accurate estimation of
the duty cycles given by Equation 45, where power losses across diodes and the internal
power MOSFET are taken into account.
Equation 45
Figure 21. Maximum output current according to switch max. peak current (3.0 A):
VO = - 5 V
D
VOUT VD
–
V
– IN VSW VOUT VD
–
+
–
-----------------------------------------------------------------
=



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