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PDF TDA8946J Data sheet ( Hoja de datos )
| Número de pieza | TDA8946J | |
| Descripción | 2 x 15 W stereo Bridge Tied Load BTL audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8946J
2 x 15 W stereo Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 14 March 2000
Product specification
1. General description
The TDA8946J is a dual-channel audio power amplifier with an output power of
2 × 15 W at an 8 Ω load and a 18 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8946J
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8946J is
printed-circuit board (PCB) compatible with all other types in the TDA894x family.
One PCB footprint accommodates both the mono and the stereo products.
2. Features
c
c
s Few external components
s Fixed gain
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.
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
Conditions
VCC = 18 V; RL = ∞
Min Typ Max Unit
6 18 25 V
- 28 42 mA
- - 10 µA
1 page  
Philips Semiconductors
TDA8946J
2 x 15 W stereo BTL audio amplifier
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 8. The maximum output power is limited by the maximum
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 Ω and Po = 10 W at THD = 0.1% (see Figure 6), the
Average Listening Level (ALL) – music power – without any distortion yields:
Po(ALL) = 10 W/15.85 = 631 mW.
The power dissipation can be derived from Figure 11 on page 11 for 0 dB
respectively 12 dB headroom.
Table 4: Power rating as function of headroom
Headroom
Power output (THD = 0.1%)
0 dB
12 dB
Po = 10 W
Po(ALL) = 631 mW
Power dissipation (P)
18 W
8W
For the average listening level a power dissipation of 8 W can be used for a heatsink
calculation.
8.3 Mode selection
The TDA8946J has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE. See Figure 4 and 5 for the respective DC levels,
which depend on the supply voltage level. The MODE pin can be driven by a 3-state
logic output stage: e.g. a microcontroller with additional components for DC-level
shifting.
Standby — In this mode the current consumption is very low and the outputs are
floating. The device is in standby mode when (VCC − 0.5 V) < VMODE < VCC, or when
the MODE pin is left floating (high impedance). The power consumption of the
TDA8946J will be reduced to <0.18 mW.
9397 750 06863
Product specification
Rev. 02 — 14 March 2000
© Philips Electronics N.V. 2000. All rights reserved.
5 of 23
5 Page 
Philips Semiconductors
TDA8946J
2 x 15 W stereo BTL audio amplifier
100
handbook,ηhalfpage
(%)
80
60
40
RL = 16 Ω
8Ω
MGU013
20
handbook, halfpage
P
(W)
16
RL = 8 Ω
12
16 Ω
8
MGU012
20
0
0 4 8 12 16
Po (W)
VCC = 18 V.
Fig 10. Efficiency as function of output power.
0
handbooαkc, hsalfpage
(dB)
−20
4
0
0 4 8 12 16
Po (W)
VCC = 18 V.
Fig 11. Power dissipation as function of output power.
MGU009
−40
−60
−80
−100
10
102 103
No bandpass filter applied.
Fig 12. Channel separation as function of frequency.
104 105
f (Hz)
9397 750 06863
Product specification
Rev. 02 — 14 March 2000
© Philips Electronics N.V. 2000. All rights reserved.
11 of 23
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