tda8941p NXP Semiconductors, tda8941p Datasheet - Page 4

• Manufacturer Part Number: tda8941p
• Description: 1.5 W Mono Bridge Tied Load Btl Audio Amplifier
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 06864
Product specification
8.2.1 Output power measurement
8.2.2 Headroom
8.2 Power amplifier
The input cut-off frequency is:
For R
As shown in
necessary;
minimized. This results in a good low frequency response and good switch-on
behaviour.
Remark: To prevent HF oscillations do not leave the inputs open, connect a capacitor
of at least 1.5 nF across the input pins close to the device.
The power amplifier is a Bridge Tied Load (BTL) amplifier with an all-NPN output
stage, capable of delivering a peak output current of 2 A.
The BTL principle offers the following advantages:
The output power as a function of the supply voltage is measured on the output pins
at THD = 10%; see
power dissipation in the plastic package.
Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom –
compared to the average power output – for transferring the loudest parts without
distortion. At V
Average Listening Level (ALL) – music power – without any distortion yields:
The power dissipation can be derived from
respectively 12 dB headroom.
f
f
•
•
•
•
i cut off
i cut off
P
Lower peak value of the supply current
The ripple frequency on the supply voltage is twice the signal frequency
No expensive DC-blocking capacitor
Good low frequency performance.
o(ALL)
i
–
–
= 45 k and C
= 1 W/15.85 = 63 mW.
=
=
so the switch-on delay during charging of the input capacitors, can be
Equation 1
---------------------------------------------------------------- -
2
---------------------------- -
2
CC
45 10
R
= 9 V, R
1
i
Rev. 02 — 7 April 2000
Figure
i
C
= 220 nF:
i
3
and 2, large capacitor values for the inputs are not
1
L
8. The maximum output power is limited by the maximum
= 16
220 10
and P
9 –
=
o
16 Hz
= 1 W at THD = 1% (see
Figure 11 on page 10
1.5 W mono BTL audio amplifier
© Philips Electronics N.V. 2000. All rights reserved.
TDA8941P
for 0 dB
Figure
6), the
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(1)
(2)