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R5975D датащи(PDF) 28 Page - STMicroelectronics

номер детали R5975D
подробное описание детали  Up to 3 A step-down switching regulator for aerospace applications
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

R5975D датащи(HTML) 28 Page - STMicroelectronics

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Application information
R5975D
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DocID026878 Rev 1
The dissipated power of the device is tied to three different sources:
Conduction losses due to the not insignificant RDS(on), which are equal to:
Equation 23
where D is the duty cycle of the application. Note that the duty cycle is theoretically given by
the ratio between VOUT and VIN, but in practice it is substantially higher than this value to
compensate for the losses in the overall application. For this reason, the switching losses
related to the RDS(on) increase compared to an ideal case.
Switching losses due to turning on and off. These are derived using the following
equation:
Equation 24
where TRISE and TFALL represent the switching times of the power element that cause the
switching losses when driving an inductive load (see Figure 14). TSW is the equivalent
switching time.
Figure 14. Switching losses
Quiescent current losses.
Equation 25
where IQ is the quiescent current.
PON
RDS on

IOUT

2 D
=
PSW
VIN IOUT
TON TOFF
+

2
------------------------------------ FSW VIN
=
IOUT TSW FSW

=
PQ
VIN IQ
=



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