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L6739 Datasheet(PDF) 26 Page - STMicroelectronics

Part # L6739
Description  CPU and DSP power supply
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6739 Datasheet(HTML) 26 Page - STMicroelectronics

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Application information
L6739
26/30
DocID026384 Rev 1
10.3
Input capacitors
The input capacitor bank is designed considering mainly the input RMS current that
depends on the output deliverable current (IOUT) and the duty cycle (D) for the regulation as
follows:
Equation 18
The equation reaches its maximum value, IOUT / 2, with D = 0.5. The losses depend on the
input capacitor ESR and, in the worst case, are:
Equation 19
Irms
IOUT
D1 D
–

=
PESR
IOUT 2

2
=



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