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PDF TDA8941 Data sheet ( Hoja de datos )
| Número de pieza | TDA8941 | |
| Descripción | 1.5 W mono Bridge Tied Load BTL audio amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDA8941P
1.5 W mono Bridge Tied Load (BTL) audio amplifier
Rev. 02 — 7 April 2000
Product specification
1. General description
The TDA8941P is a single-channel audio power amplifier with an output power of
1.5 W at an 16 Ω load and a 9 V supply. The circuit contains a Bridge Tied Load
(BTL) amplifier with an all-NPN output stage and standby/mute logic. The TDA8941P
comes in a 8-pin dual in-line (DIP8) package. The TDA8941P 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 = 9 V; RL = ∞
Min Typ Max Unit
6 9 18 V
- 14 20 mA
- - 10 µA
1 page  
Philips Semiconductors
TDA8941P
1.5 W mono BTL audio amplifier
Table 4: Power rating as function of headroom
Headroom
Power output (THD = 1%)
0 dB
12 dB
Po = 1 W
Po(ALL) = 63 mW
Power dissipation (P)
1.15 W
0.6 W
For the average listening level a power dissipation of 0.6 W can be used for
calculation of the maximum ambient temperature.
8.3 Mode selection
The TDA8941P 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
TDA8941P 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.
8.4 Supply Voltage Ripple Rejection (SVRR)
The SVRR is measured with an electrolytic capacitor of 10 µF on pin SVR at a
bandwidth of 10 Hz to 80 kHz. Figure 12 on page 11 illustrates the SVRR as function
of the frequency. A larger capacitor value on the SVR pin improves the ripple rejection
behaviour at the lower frequencies.
9397 750 06864
Product specification
Rev. 02 — 7 April 2000
© Philips Electronics N.V. 2000. All rights reserved.
5 of 21
5 Page 
Philips Semiconductors
TDA8941P
1.5 W mono BTL audio amplifier
0
handbook, full pagewidth
SVRR
(dB)
−20
B
−40
MGU024
−60
A
−80
10 102 103 104
VCC = 9 V; RS = 0 Ω; Vripple = 700 mV (RMS); no bandpass filter applied.
Curve A: inputs short-circuited
Curve B: inputs short-circuited and connected to ground (asymmetrical application)
Fig 12. Supply voltage ripple rejection as function of frequency.
f (Hz)
105
9397 750 06864
Product specification
Rev. 02 — 7 April 2000
© Philips Electronics N.V. 2000. All rights reserved.
11 of 21
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet TDA8941.PDF ] | |
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