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Número de pieza TDA8946AJ
Descripción 2 x 15 W BTL audio amplifier
Fabricantes Philips 
Logotipo Philips Logotipo



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TDA8946AJ
2 x 15 W BTL audio amplifier with DC gain control
Rev. 01 — 01 March 2002
M3D541
Product data
1. General description
The TDA8946AJ is a dual-channel audio power amplifier with DC gain control. It has
an output power of 2 × 15 W at an 8 load and an 18 V supply. The circuit contains
two Bridge-Tied Load (BTL) amplifiers with an all-NPN output stage and
standby/mute logic. The overall gain can be adjusted from +30 dB down to 50 dB
using a DC control voltage. This feature can be used for volume control or for a preset
gain. The TDA8946AJ comes in a 17-pin DIL-bent-SIL (DBS) power package and is
pin compatible with the TDA8946J.
2. Features
s Gain/volume adjustment via a DC control pin
s Soft clipping
s Operating at a low supply voltage
s Standby and mute mode
s No on/off switching plops
s Low standby current
s High supply voltage ripple rejection
s Outputs short-circuit protected to ground, supply and across the load
s Thermally protected
s Printed-circuit board compatible with TDA8944AJ and TDA8580J.
3. Applications
s Mains fed applications (e.g. TV sound)
s PC audio
s Portable audio.
4. Quick reference data
Table 1: Quick reference data
Symbol Parameter
VCC supply voltage
Iq quiescent supply current
Istb standby supply current
Po output power
THD total harmonic distortion
Conditions
VCC = 18 V; RL =
THD = 10%; RL = 8 ;
VCC = 18 V
Po = 1 W
Min Typ Max Unit
4.5 18 18 V
- 45 55 mA
- - 10 µA
13 15 -
W
- 0.07 0.5 %

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TDA8946AJ pdf
Philips Semiconductors
TDA8946AJ
2 x 15 W BTL audio amplifier with DC gain control
The input cut-off frequency is:
f i(cut off ) = 2----π----(--0---.-5-----×-1----R----i---×----C-----i--)
For Ri = 32 kand Ci = 220 nF:
(1)
f i(cut off ) = -2---π----(--0---.-5-----×-----3---2----×-----1---10---3----×-----2---2---0-----×----1---0------9---) = 45.2 Hz
(2)
As shown in Equation 2, large capacitors values for the inputs are not necessary; so
the switch-on delay during charging of the input capacitors can be minimized. This
results in a good low frequency response and good switch-on behaviour.
Remark: To prevent high frequency oscillations do not leave the inputs open, connect
a capacitor of 4.7 nF across the input pins close to the device (see Figure 15).
8.2 Power amplifier
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:
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.
8.2.1 Output power measurement
The output power as a function of the supply voltage is measured on the output pins
at THD = 10%; see Figure 10. The maximum output power is limited by the supply
voltage of 18 V and the maximum available output current: 2 A repetitive peak
current.
8.2.2 Headroom
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 VCC = 18 V, RL = 8 and Po = 10 W at THD = 0.5% (see Figure 8), the
Average Listening Level (ALL) - music power - without any distortion yields:
Po(ALL) = 1-1--5-0--.--8-W--5-- = 631 mW
The power dissipation can be derived from Figure 12 on page 11 for 0 dB
respectively 12 dB headroom.
(3)
9397 750 09434
Product data
Rev. 01 — 01 March 2002
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
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TDA8946AJ arduino
Philips Semiconductors
TDA8946AJ
2 x 15 W BTL audio amplifier with DC gain control
handbook,2h0alfpage
P
(W)
16
12
8
4
MGW619
0
handbαocoks, halfpage
(dB)
20
40
60
80
MGW620
0
0 4 8 12 16 20
Po (W)
100
10
102 103 104 105
f (Hz)
VCC = 18 V; RL = 8
Fig 12. Power dissipation as function of output power.
VCC = 18 V; no bandpass filter applied
Fig 13. Channel separation as function of frequency.
0
handbook, halfpage
SVRR
(Hz)
20
MGW621
40
B
A
60
80
100
10
102 103 104 105
f (Hz)
VCC = 18 V; Rsource = 0 ; Vripple = 707 mV (RMS); a bandpass filter of 10 Hz to 80 kHz has been applied.
Curve A: inputs short-circuited
Curve B: inputs short-circuited and connected to ground.
Fig 14. Supply voltage ripple rejection as function of frequency.
9397 750 09434
Product data
Rev. 01 — 01 March 2002
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
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