TDA7294
Figure 16:
Turn ON/OFF Suggested Sequence
+Vs
(V)
+35
-35
-Vs
VIN
(mV)
VST-BY
PIN #9
(V)
5V
VMUTE
PIN #10
(V)
5V
IP
(mA)
VOUT
(V)
OFF
ST-BY
PLAY
MUTE
MUTE
D93AU013
ST-BY
OFF
In addition to the overload protection described
above, the device features a thermal shutdown
circuit which initially puts the device into a muting
state (@ Tj = 145
o
C) and then into stand-by (@
Figure 17:
Single Signal ST-BY/MUTE Control
Circuit
Tj = 150
o
C).
Full protection against electrostatic discharges on
every pin is included.
3) Other Features
The device is provided with both stand-by and
mute functions, independently driven by two
CMOS logic compatible input pins.
The circuits dedicated to the switching on and off
of the amplifier have been carefully optimized to
avoid any kind of uncontrolled audible transient at
the output.
The sequence that we recommend during the
ON/OFF transients is shown by Figure 16.
The application of figure 17 shows the possibility
of using only one command for both st-by and
mute functions. On both the pins, the maximum
applicable range corresponds to the operating
supply voltage.
9/16
MUTE
MUTE/
ST-BY
20K
10K
30K
STBY
1N4148
10µF
10µF
D93AU014
STMICROELECTRONICS [ STMICROELECTRONICS ]
