TDA8920C Datasheet, PDF (7/40 Pages) NXP Semiconductors – 2 X110 W class-D power amplifier

NXP Semiconductors
TDA8920C
2 × 110 W class-D power amplifier
To fully charge the coupling capacitors at the inputs, the amplifier automatically remains in
the Mute mode before switching to the Operating mode. A complete overview of the
start-up timing is shown in Figure 5.
V_MODE
> 4.2 V
(1)
50 %
duty cycle
audio output
modulated PWM
operating
2.2 V < V_MODE < 3 V
mute
0 V (SGND) ^standby
100 ms
> 350 ms
time
50 ms
V_MODE
> 4.2 V
(1)
50 %
duty cycle
audio output
modulated PWM
operating
2.2 V < V_MODE < 3 V
mute
0 V (SGND) ^standby
100 ms
50 ms
> 350 ms
time
001aah657
(1) First ¹â„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 is set to operating but
not earlier than 150 ms after switching to mute. To start up pop noise-free, 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 delay of 100 ms
before the outputs start switching. The audio signal is available after a second delay of 50 ms. To
start up pop noise-free, 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 pin MODE
TDA8920C_1
Preliminary data sheet
Rev. 01 — 29 September 2008
© NXP B.V. 2008. All rights reserved.
7 of 40