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PDF TDA8943 Data sheet ( Hoja de datos )
| Número de pieza | TDA8943 | |
| Descripción | 6 W mono Bridge Tied Load BTL audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8943SF
6 W mono Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 7 April 2000
Product specification
1. General description
The TDA8943SF is a single-channel audio power amplifier with an output power of
6 W at an 8 Ω load and a 12 V supply. The circuit contains a Bridge Tied Load (BTL)
amplifier with an all-NPN output stage and standby/mute logic. The TDA8943SF
comes in a 9-lead single in-line (SIL) medium power package. The TDA8943SF 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
- 15 22 mA
- - 10 µA
1 page  
Philips Semiconductors
TDA8943SF
6 W mono Bridge Tied Load (BTL) audio amplifier
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)
3.8 W
1.8 W
For the average listening level a power dissipation of 1.8 W can be used for a
heatsink calculation.
8.3 Mode selection
The TDA8943SF 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
TDA8943SF will be reduced to <0.18 mW.
Mute — In this mode the amplifier is DC-biased but not operational (no audio output);
the DC level of the input and output pins remain on half the supply voltage. This
allows the input coupling and Supply Voltage Ripple Rejection (SVRR) capacitors to
be charged to avoid pop-noise. The device is in mute mode when
3 V < VMODE < (VCC − 1.5 V).
Operating — In this mode the amplifier is operating normally. The operating mode is
activated at VMODE < 0.5 V.
8.3.1 Switch-on and switch-off
To avoid audible plops during supply voltage switch-on or switch-off, the device is set
to standby mode before the supply voltage is applied (switch-on) or removed
(switch-off).
The switch-on and switch-off time can be influenced by an RC-circuit on the MODE
pin. Rapid on/off switching of the device or the MODE pin may cause ‘click- and
pop-noise’. This can be prevented by proper timing of the RC-circuit on the MODE
pin.
9397 750 06865
Product specification
Rev. 02 — 7 April 2000
© Philips Electronics N.V. 2000. All rights reserved.
5 of 20
5 Page 
Philips Semiconductors
TDA8943SF
6 W mono Bridge Tied Load (BTL) audio amplifier
13. Internal circuitry
Table 9:
Pin
4 and 5
Internal circuitry
Symbol
IN+ and IN−
Equivalent circuit
VCC
VCC
1.5 kΩ 1.5 kΩ
5
45 kΩ
45 kΩ
1 and 3
OUT− and OUT+
1/2 VCC
(SVR)
VCC
4
MGU078
7 MODE
100 Ω
40 Ω
1/2 VCC
VCC
1, 3
MGU080
VCC
6 SVR
VCC
20 kΩ
1 kΩ
1 kΩ
7
OFF
HIGH
MUTE
HIGH
MGU079
VCC
Standby
20 kΩ
6
20 kΩ
MGU081
9397 750 06865
Product specification
Rev. 02 — 7 April 2000
© Philips Electronics N.V. 2000. All rights reserved.
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