DocID027887 Rev 2

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STPA008

General information

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design, allows a continuous operation when battery falls down. At 6 V it is still fully

operational, only the maximum output power is reduced according to the available voltage

supply.

If the battery voltage drops below the minimum operating voltage of 6V the amplifier is fast

muted, the capacitor on SVR is discharged and the amplifier restarts when the battery

voltage returns to the correct voltage.

4.2.2

Cranks

STPA008 can sustain worst case cranks from 16 V to 6 V, continuing to play and without

producing any pop noise.

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

allowed battery transitions.

Figure 21. Battery cranking curve example 1

V1 = 16 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 22. Battery cranking curve example 2

V1 = 16 V; V2 = 6 V; V3 = 7 V

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