FDA903D datasheet(52/82 Pages) STMICROELECTRONICS

Part #	FDA903D

Description	1 x 45 W class D digital input automotive power amplifier with ILoad current monitoring, wide voltage operation range for car audio and telematic

PDF	82 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Additional features

FDA903D

52/82

DocID031502 Rev 2



The current sensing full scale set through IB8[7,6] corresponds to the following 15-bit

digital word read on I2Stest:

–

437.5 mFs

if WS = 44.1 kHz or 48 kHz, IB1[4,3]='00'

–

500 mFs

if WS = 44.1 kHz or 48 kHz, IB1[4,3]='01'

–

562.5 mFs

If WS = 44.1 kHz or 48 kHz, IB1[4,3]='10'

–

250 mFs

if WS = 96 kHz

–

125 mFs

if WS = 192 kHz

The function provides the current information only in MUTE and PLAY states.

12.4.2

Current sensing limitations

The maximum current sensing full scale is 8 A, even if the device can drive up to 11 A

typically.

The default full scale is 8 A. The user can choose a lower full scale in order to increase the

resolution. However, setting a lower full scale is not suggested when enabling the Open

Load in Play Detector or Output Current Offset Detector.

As depicted in Figure 63, the current sensing provides the measured differential current

flowing through OUTP and OUTM, which is different from the current flowing through the

speaker due to the external filter capacitors. This mentioned contribution could be significant

at high frequency. Moreover, the current sensing circuit comprehends a low-pass filter

attenuating signals over 20 kHz frequency.

FDA903D Datasheet(PDF) 52 Page - STMicroelectronics