參數(shù)資料
型號(hào)： TDA8942P/N1,112
廠商： NXP SEMICONDUCTORS
元件分類： 音頻／視頻放大
英文描述： 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP16
封裝： 0.300 INCH, PLASTIC, SOT-38-1, MO-001, DIP-16
文件頁(yè)數(shù)： 18/22頁(yè)
文件大?。?/td> 394K
代理商： TDA8942P/N1,112
Philips Semiconductors
TDA8942P
2 x 1.5 W (3 W music power) stereo BTL audio amplier
Product data
Rev. 03 — 02 September 2003
5 of 22
9397 750 11707
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
8.
Functional description
The TDA8942P is a stereo BTL audio power amplier capable of delivering 2
× 1.5 W
output power to a 16
load at THD = 10 %, using a 9 V power supply. The voltage
gain is xed 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 conguration
The TDA8942P inputs can be driven symmetrical (oating) 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 =45k and Ci = 220 nF:
(2)
As shown in Equation 1 and Equation 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
behavior.
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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