Philips TDA8943SF User Manual
TDA8943SF
7 W mono Bridge Tied Load (BTL) audio amplifier
14 April 1999 Preliminary specification
1. General description
The TDA8943SF is a single-channel audio power amplifier with an output power of
7 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
■ Few external components
■ Fixed gain
■ Standby and mute mode
■ No on/off switching plops
■ Low standby current
■ High supply voltage ripple rejection
■ Outputs short-circuit protected to ground, supply and across the load
■ Thermally protected
■ Printed-circuit board compatible, see Table 3 “Product family overview”.
3. Applications
■ Mains fed applications (e.g. TV sound)
■ PC audio
■ Portable audio.
4. Quick reference data
Table 1: Quick reference data
Symbol Parameter Conditions Min Typ Max Unit
V
CC
I
q
I
stb
supply voltage 6 12 18 V
quiescent supply current VCC=12V; RL=∞ - 1522mA
standby supply current - - 10 µA
Philips Semiconductors
TDA8943SF
7 W mono BTL audio amplifier
Table 1: Quick reference data
Symbol Parameter Conditions Min Typ Max Unit
P
o
THD total harmonic distortion P
G
v
SVRR supply voltage ripple
5. Ordering information
Table 2: Ordering information
Type number Package
TDA8943SF SIL9MPF plastic single in-line medium power package
5.1 Ordering options
Table 3: Product family overview
Type number Package Description
TDA8941P DIP8 1.5 W mono Bridge Tied Load (BTL) audio amplifier
TDA8942P DIP16 2 x 1.5 W stereo Bridge Tied Load (BTL) audio amplifier
TDA8943SF SIL9MPF 7 W mono Bridge Tied Load (BTL) audio amplifier
TDA8944J DBS17P 2 x 7 W stereo Bridge Tied Load (BTL) audio amplifier
TDA8945S SIL9P 15 W mono Bridge Tied Load (BTL) audio amplifier
TDA8946J DBS17P 2 x 15 W stereo Bridge Tied Load (BTL) audio amplifier
…continued
output power THD = 10%; RL=8Ω;
=12V
V
CC
= 1 W - 0.03 0.1 %
o
voltage gain 31 32 33 dB
rejection
Name Description Version
with fin; 9 leads
67- W
50--dB
SOT110-1
9397 750 04877
Preliminary specification 14 April 1999 2 of 12
© Philips Electronics N.V. 1999. All rights reserved.
Philips Semiconductors
6. Block diagram
TDA8943SF
7 W mono BTL audio amplifier
dth
Fig 1. Block diagram.
7. Pinning information
7.1 Pinning
IN−
IN+
MODE
SVR
TDA8943SF
5
4
7
STANDBY/
MUTE LOGIC
6
kΩ
kΩ
20
20
V
CC
V
CC
GND
2
SHORT CIRCUIT
TEMPERATURE
PROTECTION
8
AND
MBK942
1
OUT−
3
OUT+
handbook, halfpage
Fig 2. Pin configuration.
OUT−
V
CC
OUT+
IN+
IN−
SVR
MODE
GND
n.c.
1
2
3
4
5
TDA8943SF
6
7
8
9
MBK941
9397 750 04877
© Philips Electronics N.V. 1999. All rights reserved.
Preliminary specification 14 April 1999 3 of 12
Philips Semiconductors
7.2 Pin description
Table 4: Pin description
Symbol Pin Description
OUT− 1 negative loudspeaker terminal
V
CC
OUT+ 3 positive loudspeaker terminal
IN+ 4 positive input
IN− 5 negative input
SVR 6 half supply voltage decoupling (ripple rejection)
MODE 7 mode selection input (standby, mute, operating)
GND 8 ground
n.c. 9 not connected
8. Functional description
The TDA8943SF is a mono BTL audio power amplifier capable of delivering 7 W
output power to an 8 Ω load at THD = 10%, using a 12 V power supply and an
external heatsink. The voltage gain is fixed at 32 dB.
TDA8943SF
7 W mono BTL audio amplifier
2 supply voltage
With the three-level MODE input the device can be switched from ‘standby’ to ‘mute’
and to ‘operating’ mode.
The TDA8943SF outputs are protected by an internal thermal shutdown protection
mechanism and a short-circuit protection.
8.1 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 1.5 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 Mode selection
The TDA8943SF has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE.
Standby — In this mode the current consumption is very low and the outputs are
floating. The device is in standby mode when V
MODE pin is left floating.
>(VCC− 0.5 V), or when the
MODE
Mute — In this mode the amplifier is DC-biased but not operational (no audio output).
This allows the input coupling capacitors to be charged to avoid pop-noise. The
device is in mute mode when 2.5V<V
9397 750 04877
Preliminary specification 14 April 1999 4 of 12
<(VCC− 1.5 V).
MODE
© Philips Electronics N.V. 1999. All rights reserved.
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