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A5974D 데이터시트(PDF) 30 Page - STMicroelectronics

부품명 A5974D
상세설명  Zero load current operation
PDF  46 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A5974D 데이터시트(HTML) 30 Page - STMicroelectronics

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Application information
A5974D
30/46
DocID018774 Rev 2
8.4
R.M.S. current of the embedded Power MOSFET
As the A5974D device embeds the high-side switch and so the internal power dissipation is
sometimes the bottleneck for the output current capability (refer to Section 8.3 on page 24
for the estimation of the operating temperature).
Nevertheless, as mentioned in Description on page 1, the device can manage a continuous
output current of 2.5 A in most of the application conditions.
However the rated maximum RMS current of the power elements is 2 A, where:
Equation 31
and the real duty cycle D:
Equation 32
Fixing the limit of 2 A for IRMS HS the maximum output current can be derived, as illustrated
in Figure 18..
Figure 18. Maximum continuous output current vs. duty cycle
IRMS HS
ILOAD
D
=
D
VOUT
RDS ON LS DCR
+
 I
LOAD
+
VIN
RDS ON LS RDS ON HS
–
 I
LOAD
+
----------------------------------------------------------------------------------------------------
=



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