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TDA8942P датащи(PDF) 4 Page - NXP Semiconductors

номер детали TDA8942P
подробное описание детали  2 x 1.5 W stereo Bridge Tied Load BTL audio amplifier
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
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Philips Semiconductors
TDA8942P
2 x 1.5 W stereo BTL audio amplifier
Product specification
Rev. 02 — 14 March 2000
4 of 23
9397 750 06862
© Philips Electronics N.V. 2000. All rights reserved.
8.
Functional description
The TDA8942P is a stereo BTL audio power amplifier capable of delivering 2
× 1.5 W
output power to a 16
Ω load at THD = 10%, using a 9 V power supply. The voltage
gain is fixed at 32 dB.
With the three-level MODE input the device can be switched from ‘standby’ to ‘mute’
and to ‘operating’ mode.
The TDA8942P outputs are protected by an internal thermal shutdown protection
mechanism and a short-circuit protection.
8.1 Input configuration
The TDA8942P inputs can be driven symmetrical (floating) as well as asymmetrical.
In the asymmetrical mode one input pin is connected via a capacitor to the signal
ground which 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 VCC, so
coupling capacitors for both pins are necessary.
The input cut-off frequency is:
(1)
For Ri =45kΩ and Ci = 220 nF:
(2)
As shown in Equation 1 and 2, large capacitor values for the inputs are not
necessary; so the switch-on delay during charging of the input capacitors, can be
minimized. This results in a good low frequency response and good switch-on
behaviour.
Remark: To prevent HF oscillations do not leave the inputs open, connect a capacitor
of at least 1.5 nF across the input pins close to the device.
f
i cut
off
()
1
2
π R
i
C
i
×
()
-----------------------------
=
f
i cut
off
()
1
2
π 45 10
3
×
220
×
10
9
×
()
-----------------------------------------------------------------
16 Hz
==


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