Stereo Amplifier with Mute and Stand-by Circuit

SINGLE SUPPLY

TDA7499
6 + 6W STEREO AMPLIFIER WITH MUTE AND STAND-BY
DESCRIPTION
The UTC TDA7499 is class AB dual Audio Power Amplifier
and designed for high quality sound application as Hi-Fi
music centers and stereo TV sets.

FEATURES
- Wide supply voltage range up to ±18V
- 6 + 6W @ THD =10%, RL = 8Ω, VS = +14V
- No POP at Turn-On/Off
- MUTE (POP free)
- STAND-BY feature (Low Iq)
- Short circuit protection to GND
- Thermal overload protection

MUTE/STAND-BY FUNCTION
MUTE/STAND-BY function is assembled at pin 5 and to control
the amplifier status by two different thresholds,referred to +VS.
-When Vpin5 higher than = +VS - 2.5V the amplifier is in Stand-by
mode and the final stage generators are off
-When Vpin5 is between +VS - 2.5V and +VS - 6V the final stage
current generators are switched on and the amplifier is in mute mode
-When Vpin5 is lower than +VS - 6V the amplifier is play mode.

TDA7499 Datasheet Pdf

30W Bridge Amplifier Circuit

TDA2040
20W Hi-Fi AUDIO POWER AMPLIFIER
DESCRIPTION
The TDA2040 is a monolithic integrated circuit in
Pentawatt[ package,intended for use as an audio
class AB amplifier. Typically it provides22W output
power (d = 0.5%) at Vs = 32V/4W . The TDA2040
provides high output current and has very low
harmonic and cross-over distortion. Further the
device incorporates a patented short circuit protection
system comprising an arrangement for automaticallylimiting
the dissipatedpowersoas to keep
the working point of the output transistors within
their safe operating area. A thermal shut-down
system is also included.

ABSOLUTE MAXIMUM RATINGS
Vs Supply Voltage ± 20 V
Vi Input Voltage Vs
Vi Differential Input Voltage ± 15 V
Io Output Peak Current (internally limited) 4 A
Ptot Power Dissipation at Tcase = 75 °C 25 W
Tstg, Tj Storage and Junction Temperature – 40 to + 150 °C

TDA2040 Datasheet Pdf

Single Supply High Power Amplifier Circuit

TDA2030A

18W Hi-Fi AMPLIFIER AND 35W DRIVER
DESCRIPTION
The TDA2030A is a monolithic IC in Pentawatt Ò
package intended for use as low frequency class
AB amplifier.
With VS max = 44V it is particularly suited for more
reliable applications without regulated supply and
for 35W driver circuits using low-cost complementary
pairs.
The TDA2030A provides high output current and
has very low harmonic and cross-over distortion.
Further the device incorporates a short circuit protection
system comprising an arrangement for
automatically limiting the dissipated power so as to
keep the working point of the output transistors
within their safe operating area. A conventional
thermal shut-down system is also included.

SHORT CIRCUIT PROTECTION
The TDA2030A has an original circuit which limits
the current of the output transistors. This function
can be considered as being peak power limiting
rather than simple current limiting. It reduces the
possibility that the device gets damaged during an
accidental short circuit from AC output to ground.
THERMAL SHUT-DOWN
The presence of a thermal limiting circuit offers the
following advantages:
1. An overload on the output (even if it is
permanent), or an above limit ambient
temperature can be easily supported since the
Tj cannot be higher than 150 C.

2. The heatsink can have a smaller factor of safety
compared with that of a conventional circuit.
There is no possibility of device damage due to
high junction temperature. If for any reason, the
junction temperature increases up to 150 C,
the thermal shut-down simply reduces the
power dissipat ion and the current
consumption.

TDA2030A Datasheet Pdf