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L6911E Folha de dados(PDF) 26 Page - STMicroelectronics

Nome de Peças L6911E
Descrição Electrónicos  5-Bit programmable step down controller with synchronous rectification
PDF  34 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6911E Folha de dados(HTML) 26 Page - STMicroelectronics

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VRM demo board description
L6911E
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6.4
Input capacitor
For IOUT = 28.5A and with D = 0.5(worst case for input current ripple), Irms is equal to 17.8A.
Three OSCON electrolityc capacitors 6SP680M, with a maximum ESR equal to 12m
Ω, are
chosen to substain the ripple. So the losses in worst case are:
Equation 25
6.5
Over-current protection
Substituting the demo board parameters in the relationship reported in the relative section,
(IOCSMIN = 170µA; IP =33A; RDSONMAX = 3mΩ) it results that ROCS = 1kΩ.
PESR I
rms
2
⋅
1.25 670
()m
()W
==



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