TDA8920C NXP Semiconductors, TDA8920C Datasheet - Page 7

• Manufacturer Part Number: TDA8920C
• Description: The TDA8920C is a high-efficiency class-D audio power amplifier
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8920C_2
Product data sheet
To ensure the coupling capacitors at the inputs (C
the outputs start switching, a delay is inserted during the transition from Mute to Operating
mode. An overview of the start-up timing is provided in
MODE pin should be forced LOW at least 100 ms before the supply lines (V
drop below 12.5 V.
Fig 5.
(1) First
2.2 V
2.2 V
Upper diagram: When switching from Standby to Mute, there is a delay of approximately 100 ms
before the output starts switching. The audio signal will become available once V
Operating mode level (see
pop noise-free, it is recommended that the time constant applied to pin MODE be at least 350 ms
for the transition between Mute and Operating modes.
Lower diagram: When switching directly from Standby to Operating mode, there is a delay of
100 ms before the outputs start switching. The audio signal becomes 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 be at least 500 ms for the transition between Standby and Operating modes.
Timing on mode selection input pin MODE
1
V
V
4
MODE
MODE
0 V (SGND)
0 V (SGND)
pulse down.
V
V
MODE
4.2 V
MODE
4.2 V
3 V
3 V
Rev. 02 — 11 June 2009
standby
standby
Table
8), but not earlier than 150 ms after switching to Mute. To start-up
duty cycle
duty cycle
100 ms
100 ms
50 %
50 %
mute
mute
(1)
(1)
50 ms
50 ms
IN
in
2
Figure
Figure
modulated PWM
modulated PWM
110 W class-D power amplifier
audio output
audio output
operating
operating
> 350 ms
> 350 ms
10) are fully charged before
5. For proper switch-off, the
TDA8920C
© NXP B.V. 2009. All rights reserved.
MODE
001aah657
DDA
time
time
reaches the
and V
7 of 39
SSA
)