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PDF TDA8944 Data sheet ( Hoja de datos )
| Número de pieza | TDA8944 | |
| Descripción | 2 x 7 W stereo Bridge Tied Load BTL audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8944J
2 x 7 W stereo Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 14 February 2000
Product specification
1. General description
The TDA8944J is a dual-channel audio power amplifier with an output power of
2 × 7 W at an 8 Ω load and a 12 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8944J 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 = 12 V; RL = ∞
Min Typ Max Unit
6 12 18 V
- 24 36 mA
- - 10 µA
1 page  
Philips Semiconductors
TDA8944J
2 x 7 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 12 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 = 12 V, RL = 8 Ω and Po = 4 W at THD = 0.1% (see Figure 6), the
Average Listening Level (ALL) – music power – without any distortion yields:
Po(ALL) = 4 W/15.85 = 252 mW.
The power dissipation can be derived from Figure 11 on page 10 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 = 4 W
Po(ALL) = 252 mW
Power dissipation (P)
8W
4W
For the average listening level a power dissipation of 4 W can be used for a heatsink
calculation.
8.3 Mode selection
The TDA8944J 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
TDA8944J will be reduced to <0.18 mW.
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
© Philips Electronics N.V. 2000. All rights reserved.
5 of 21
5 Page 
Philips Semiconductors
TDA8944J
2 x 7 W stereo BTL audio amplifier
0
handbooαkc, hsalfpage
(dB)
−20
−40
−60
−80
−100
10
102 103
No bandpass filter applied.
Fig 12. Channel separation as function of frequency.
0
handbook, full pagewidth
SVRR
(dB)
−20
MGL958
104 105
f (Hz)
MGL956
−40
B
−60
A
−80
10 102 103 104
VCC = 12 V; Rs = 0 Ω; Vripple = 707 mV (peak-to-peak); no bandpass filter applied.
Curves A: inputs short-circuited
Curves B: inputs short-circuited and connected to ground (asymmetrical application)
Fig 13. Supply voltage ripple rejection as function of frequency.
CH2
CH1
f (Hz)
105
9397 750 06861
Product specification
Rev. 02 — 14 February 2000
© Philips Electronics N.V. 2000. All rights reserved.
11 of 21
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet TDA8944.PDF ] | |
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