TDA8946AJ Datasheet, PDF (4/20 Pages) NXP Semiconductors – 2 x 15 W BTL audio amplifier with DC gain control

Philips Semiconductors
TDA8946AJ
2 x 15 W BTL audio amplifier with DC gain control
Table 3:
Symbol
GC
OUT2−
GND2
V_CC2
OUT2+
Pin description…continued…continued
Pin
Description
13
DC gain control
14
negative loudspeaker terminal 2
15
ground channel 2
16
supply voltage channel 2
17
positive loudspeaker terminal 2
8. Functional description
The TDA8946AJ is a stereo BTL audio power amplifier capable of delivering 2 × 15 W
output power to an 8 Ω load at THD = 10%, using a 18 V power supply and an
external heatsink. The gain of both amplifiers can be adjusted using a DC control
voltage (pin GC). This feature can be used for volume control or a preset gain.
With the three-level MODE input the device can be switched from ‘standby’ to ‘mute’
and to ‘operating’ mode.
The TDA8946AJ outputs are protected by an internal thermal shutdown protection
mechanism and a short-circuit protection.
8.1 Input configuration
The TDA8946AJ inputs can be driven symmetrical (floating) as well as asymmetrical.
In the asymmetrical mode (see Figure 3) one input pin is connected via a capacitor to
the signal source and the other input is connected to the signal ground. The signal
ground should be as close as possible to the SVR (electrolytic) capacitor ground.
Note that the DC level of the input pins is half of the supply voltage V_CC, so coupling
capacitors for both pins are necessary.
handbook, halfpage
signal
source
VCC
IN +
IN −
SVR
signal
ground
power
ground
Fig 3. Asymmetrical input configuration.
MGW610
9397 750 09434
Product data
Rev. 01 — 01 March 2002
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
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