Philips Semiconductors |
| TDA8943SF | |
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| 7 W mono BTL audio amplifier |
7.2 Pin description |
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| Table 4: | Pin description |
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| Symbol | Pin | Description |
| OUT− | 1 | negative loudspeaker terminal |
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| VCC | 2 | supply voltage |
| OUT+ | 3 | positive loudspeaker terminal |
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| IN+ | 4 | positive input |
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| IN− | 5 | negative input |
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| SVR | 6 | half supply voltage decoupling (ripple rejection) |
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| MODE | 7 | mode selection input (standby, mute, operating) |
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| GND | 8 | ground |
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| n.c. | 9 | not connected |
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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.
With the
The TDA8943SF outputs are protected by an internal thermal shutdown protection mechanism and a
8.1 Power amplifier
The power amplifier is a Bridge Tied Load (BTL) amplifier with an
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
•Good low frequency performance.
8.2Mode 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 VMODE > (VCC − 0.5 V), or when the MODE pin is left floating.
Mute — In this mode the amplifier is
9397 750 04877 | © Philips Electronics N.V. 1999. All rights reserved. |
Preliminary specification | 14 April 1999 | 4 of 12 |
