L9908 datasheet(75/152 Pages) STMICROELECTRONICS

部件名	L9908

功能描述	Automotive 3-Phase motor gate driver unit

PDF	152 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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75 / 152 page

Figure 48. Current monitor input CMRR - Positive Common Mode input voltage

Figure 49. Current monitor input CMRR - Negative Common Mode input voltage

CMRRn=−20log CSOnRF_RMS

+CSOnDC2

VinRF_RMS

(13)

Where:

CSOn_rf_rms = output voltage RMS calculated taking into account only the AC component of the output voltage

on the n-th CSO output.

CSOn_dc = Output DC shift (with respect to the reference value with zero AC component).

Vin_rf_rms = input voltage RMS calculated taking into account only the AC component of the input voltage on n-th

CM input (Vin = IS + -IS-).

Example:CSOn = 200 mV (reference value without RF applied) CSOn_DC_RF = 160 mV (DC output value with

RF applied) Vin_pp = 4 Vpp -> Vin_RMS = 1.4 Vrms (applied RMS RF level) CSOn_ac = 0 (i.e. no ripple at

current measurement output).

CMRR = 30.88 dB

CMRRn=−20log 0ACRMS2+ −0.04DC2

1.4

=30.88dBV

(14)

L9908

Functional description

DS13546 - Rev 5

page 75/152

L9908 数据表(PDF) 75 Page - STMicroelectronics