L6911E datasheet(26/34 Pages) STMICROELECTRONICS

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L6911E 数据表(PDF) 26 Page - STMicroelectronics

部件名	L6911E

功能描述	5-Bit programmable step down controller with synchronous rectification

PDF	34 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

26 / 34 page

VRM demo board description

L6911E

26/34

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

⋅

1.25 670

()m

()W

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