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TDA8950_1 © NXP B.V. 2008. All rights reserved.
Preliminary data sheet Rev. 01 — 9 September 2008 7 of 39
NXP Semiconductors
TDA8950
2 × 150 W class-D power amplifier
In order to fully charge the coupling capacitors at the inputs, the amplifier will remain
automatically in the Mute mode before switching to the Operating mode. A complete
overview of the start-up timing is given in Figure 5.
(1) First
1
⁄
4
pulse down.
Upper diagram: When switching from standby to mute, there is a delay of approximately 100 ms
before the output starts switching. The audio signal is available after V
MODE
has been set to
operating, but not earlier than 150 ms after switching to mute. For pop noise-free start-up it is
recommended that the time constant applied to pin MODE is at least 350 ms for the transition
between mute and operating.
Lower diagram: When switching directly from standby to operating, there is a first delay of 100 ms
before the outputs starts switching. The audio signal is available after a second delay of 50 ms. For
pop noise-free start-up it is recommended that the time constant applied to pin MODE is at least
500 ms for the transition between standby and operating.
Fig 5. Timing on mode selection input
2.2 V < V
MODE
< 3 V
audio output
operating
standby
mute
50 %
duty cycle
> 4.2 V
0 V (SGND)
time
001aah657
V
MODE
100 ms
50 ms
modulated PWM
> 350 ms
2.2 V < V
MODE
< 3 V
audio output
operating
standby
mute
50 %
duty cycle
> 4.2 V
0 V (SGND)
time
V
MODE
100 ms
50 ms
modulated PWM
> 350 ms
(1)
(1)