STA7360 ,20W BRIDGE/STEREO AUDIO AMPLIFIER WITH CLIPPING DETECTORSTA736020W BRIDGE/STEREO AUDIO AMPLIFIERWITH CLIPPING DETECTOR■ VERY FEW EXTERNAL COMPONENTS■ NO BO ..
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STA7360
20W BRIDGE/STEREO AUDIO AMPLIFIER WITH CLIPPING DETECTOR
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STA7360September 2003 VERY FEW EXTERNAL COMPONENTS NO BOUCHEROT CELLS NO BOOSTRAP CAPACITORS HIGH OUTPUT POWER NO SWITCH ON/OFF NOISE VERY LOW STAND-BY CURRENT FIXED GAIN (20dB STEREO) PROGRAMMABLE TURN-ON DELAY CLIPPING DETECTOR ST-BY FUNCTION
Protections: OUTPUT AC-DC SHORT CIRCUIT TO
GROUND AND TO SUPPLY VOLTAGE VERY INDUCTIVE LOADS LOUDSPEAKER PROTECTION OVERRATING CHIP TEMPERATURE ESD PROTECTION
DESCRIPTIONThe STA7360 is a new technology class AB Audio
Power Amplifier in the Multiwatt® package.Thanks to
the fully complementary PNP/NPN output configura-
tion the high power performance of the STA7360 is
obtained without bootstrap capacitors.
A delayed turn-on mute circuit eliminates audible on/
off noise, and a novel short circuit protection system
prevents spurious intervention with highly inductive
loads.
The device provides a circuit for the detection of clip-
ping in the output stages. The output, an open collec-
tor is able to drive systems with automatic volume
control.
20W BRIDGE/STEREO AUDIO AMPLIFIER
WITH CLIPPING DETECTOR
APPLICATION CIRCUIT
STA7360 2/18
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
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STA7360
ELECTRICAL CHARACTERISTCS (Refer to the test circuits, Tamb = 25°C, VS = 14.4V, f = 1KHz unless oth-erwise specified)
STA7360 4/18
Figure 1. STEREO Test and Application Circuit
Figure 2. P.C. Board and Component Layout (STEREO) of the circuit of fig. 1 (1:1 scale)
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STA7360
Figure 3. BRIDGE Test and Appication Circuit
Figure 4. Board and Layout (BRIDGE) of the circuit of fig. 3 (1:1 scale)
STA7360 6/18
Figure 5. Output Power vs. Supply Voltage
(Stereo)
Figure 6. Output Power vs. Supply Voltage
(Stereo)
Figure 7. Output Power vs. Supply Voltage
(Stereo)
Figure 8. Output Power vs. Supply Voltage
(Bridge)
Figure 9. Drain Current vs Supply Voltage
(Stereo)
Figure 10. Distortion vs Output Power (Stereo)
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STA7360
Figure 11. Distortion vs Output Power (Stereo)
Figure 12. Distortion vs Output Power (Stereo)
Figure 13. Distortion vs Output Power (Bridge)
Figure 14. SVR vs. Frequency & C3 (Stereo)
Figure 15. SVR vs. Frequency & C3 (Bridge)
Figure 16. Crosstalk vs. Frequency (Stereo)
STA7360 8/18
Figure 17. Power Dissipation& Efficiency vs.
Output Power(Stereo)
Figure 18. Power Dissipation& Efficiency vs.
Output Power (Stereo)
Figure 19. Power Dissipation& Efficiency vs.
Output Power (Bridge)
BLOCK DESCRIPTIONPolarizationThe device is organized with the gain re-
sistors directly connected to the signal ground pin i.e.
without gain capacitors (fig. 20).
The non inverting inputs of the amplifiers are con-
nected to the SVR pin by means of resistor dividers,
equal to the feedback networks. This allows the out-
puts to track the SVR pin which is sufficiently slow to
avoid audible turn-on and turn-off transients.
SVRThe voltage ripple on the outputs is equal to the one
on SVR pin: with appropriate selection of CSVR,
more than 60dB of ripple rejection can be obtained.
Delayed Turn-on (muting)The CSVR sets a signal turn-on delay too. A circuit is
included which mutes the device until the voltage on
SVR pin reaches ~2.5V typ. (fig. 22). The mute func-
tion is obtained by duplicating the input differential
pair (fig. 21): it can be switched to the signal source
or to an internal mute input. This feature is necessary
to prevent transients at the inputs reaching the loud-
speaker(s) immediately after power-on).
Fig. 22 represents the detailed turn-on transient with
reference to the stereo configuration.At the power-on
the output decoupling capacitors are charged
through an internal path but the device itself remains
switched off (phase 1 of the represented diagram).
When the outputs reach the voltage level of about 1V
(this means that there is no presence of short circuits)
the device switches on, the SVR capacitor starts
charging itself and the output tracks exactly the SVR
pin.During this phase the device is muted until the
SVR reaches the "Play" threshold (~2.5V typ.), after
that the music signal starts being played.
Stereo/Bridge SwitchingThere is also no need for external components for
changing from stereo to bridge configuration (figg. 20,
22). A simple short circuit between two pins allows
phase reversal at one output, yet maintaining the quies-
cent output voltage.
Stand-byThe device is also equipped with a stand-by function,
so that a low current, and hence low cost switch, can
be used for turn on/off.
StabilityThe device is provided with an internal compensation
wich allows to reach low values of closed loop gain.In
this way better performances on S/N ratio and SVR
can be obtained.
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STA7360
RECOMMENDED VALUES OF THE EXTERNAL COMPONENTS (ref to the Stereo Test and Application Circuit)
Figure 20. Block Diagram; Stereo Configuration
