TDA8922B NXP Semiconductors, TDA8922B Datasheet - Page 16

• Manufacturer Part Number: TDA8922B
• Description: The TDA8922B is a high efficiency class-D audio power amplifier with very lowdissipation
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13357
Preliminary data sheet
13.4 External clock
Maximum current (internally limited to 5 A):
BTL:
Maximum current (internally limited to 5 A):
Variables:
When using an external clock the following accuracy of the duty cycle of the external clock
has to be taken into account: 47.5 % < < 52.5 %.
If two or more class-D amplifiers are used in the same audio application, it is strongly
recommended that all devices run at the same switching frequency.This can be realized
by connecting all OSC pins together and feed them from an external central oscillator.
Using an external oscillator it is necessary to force pin OSC to a DC-level above SGND for
switching from the internal to an external oscillator. In this case the internal oscillator is
disabled and the PWM will be switched on the external frequency. The frequency range of
the external oscillator must be in the range as specified in the switching characteristics;
see
In an application circuit:
I
P
I
o peak
o peak
•
•
o 1%
R
f
t
V
P
P
P
osc
min
P
o(1%)
o(10%)
o(10%)
L
Internal oscillator: R
External oscillator: connect the oscillator signal between pins OSC and SGND; delete
R
Section
= load impedance
= single-sided supply voltage (so, if supply is 30 V symmetrical, then V
OSC
= oscillator frequency
= minimum pulse width (typical 150 ns).
=
= output power just at clipping
=
=
= output power at THD = 10 %
= 1.24
and C
-------------------------------------------------------------------------------------------- -
V
----------------------------------------------------- -
2V
---------------------------------------------------------
------------------- -
R
12.1.
L
P
R
P
+
L
OSC
1.2
1 t
R
R
P
1 t
–
L
L
.
o(1%)
–
+
min
+
2V
Rev. 01 — 1 October 2004
0.6
min
1.2
OSC
P
.
2
f
osc
R
f
connected between pin OSC and V
1 t
osc
L
–
min
f
osc
2
2
50 W class-D power amplifier
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
SSA
TDA8922B
P
= 30 V)
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(2)
(3)
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