TDA7577BLVPD datasheet(24/43 Pages) STMICROELECTRONICS

Part #	TDA7577BLVPD

Description	2 x 75 W dual-bridge power amplifier with I2C complete diagnostics and

PDF	43 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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24 / 43 page

Battery transitions management

TDA7577BLV

24/43

DocID025375 Rev 5

Battery transitions management

6.1

Low voltage operation (“start stop”)

The most recent OEM specifications require automatic stop of car engine at traffic light, in

order to reduce emissions of polluting substances. The TDA7577BLV, thanks to its

innovating design, is able to play when battery falls down to 6/7 V during such conditions,

without producing audible pop noise. The maximum system power will be reduced

accordingly.

Worst case battery cranking curves are shown below, indicating the shape and duration of

allowed battery transitions.

Figure 33. Worst case battery cranking curve sample 1

V1 = 12 V; V2 = 6 V; V3 = 7 V; V4 = 8 V

t1 = 2 ms; t2 = 50 ms; t3 = 5 ms; t4 = 300 ms; t5 =10 ms; t6 = 1 s; t7 = 2 ms

Figure 34. Worst case battery cranking curve sample 2

V1 = 12 V; V2 = 6 V; V3 = 7 V

t1 = 2 ms; t2 = 5 ms; t3 = 15 ms; t5 = 1 s; t6 = 50 ms

TDA7577BLVPD Datasheet(PDF) 24 Page - STMicroelectronics