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TDA7266P 数据表(PDF) 5 Page - STMicroelectronics

部件名 TDA7266P
功能描述  33W DUAL BRIDGE AMPLIFIER
Download  12 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA7266P 数据表(HTML) 5 Page - STMicroelectronics

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TDA7266P
Figure 5. Microprocessor Driving Signals
3.1.2 B) Low Cost Application
In low cost applications where the
µP is not present, the suggested circuit is shown in fig.6.
The St-by and mute terminals are tied together and they are connected to the supply line via an external voltage
divider.
The device is switched-on/off from the supply line and the external capacitor C4 is intended to delay the St-by
and mute threshold exceeding, avoiding "Popping" problems.
So to avoid any popping or clicking sond, it is important to clock:
a Correct Sequence: At turn-ON, the Stand-by must be removed at first, then the Mute must be re-
leased after a delay of about 100-200ms. On the contrary at turn-OFF the Mute must be activated
as first and then the Stand-by.
With the values suggested in the Application circuit the right operation is guaranteed.
b Correct Threshold Voltages: In order to avoid that due to the spread in the internal thresholds (see
the above limits) a wrong external voltage causes uncertain commutations for the two functions we
suggest to use the following values:
Mute for Vcc>6.4V
: VT = 2.3V
Mute for Vcc<6.4V
: VT = Vcc/2 - 1
Stand-by
: VT = 0.8V
+VS(V)
VIN
(mV)
VST-BY
pin 11
Iq
(mA)
ST-BY
MUTE
PLAY
MUTE
ST-BY
+7.5
1.8
0.8
VMUTE
pin 10
4.1
2.3
OFF
OFF
D03AU1535A
VOUT
(V)
2.9
1.3


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