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TDA7266M
7W MONO BRIDGEAMPLIFIER
WIDESUPPLYVOLTAGERANGE(3-18V)
MINIMUMEXTERNALCOMPONENTS
– NOSWR CAPACITOR
– NOBOOTSTRAP
– NOBOUCHEROT CELLS
– INTERNALLYFIXED GAIN
STAND-BY & MUTEFUNCTIONS
SHORTCIRCUITPROTECTION
THERMALOVERLOADPROTECTION
DESCRIPTION
The TDA7266M is a mono bridge amplifier specially designed for TV and Portable Radio applications.
BLOCK AND APPLICATIONDIAGRAM
TECHNOLOGY BI20II
Multiwatt 15
ORDERING NUMBER: TDA7266M
V
CC
0.22µF
IN1
ST-BY 7
S-GND
MUTE 6 8
August 1998
4
9
+
-
-
Vref
+
133
1
2
470µF 100nF
OUT1+
OUT1-
PW-GND
D98AU831A
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TDA7266M
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
I
P
T
T
stg,Tj
THERMAL DATA
Symbol Description Value Unit
R
th j-case
Supply Voltage 20 V
S
Output Peak Current(internally limited) 2 A
O
Total Power Dissipation (T
tot
Operating Temperature 0 to 70 °C
op
=70°C) 33 W
case
Storage and Junction Temperature -40 to +150 °C
Thermal Resistance Junction to case Typ. 1.4 Max. 2 °C/W
PIN CONNECTION
ELECTRICAL CHARACTERISTICS
(Top view)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
= 11V, RL=8Ω, f = 1kHz, T
(V
CC
D98AU832
N.C.
N.C.
VCC
N.C.
N.C.
N.C.
S-GND
PW-GND
ST-BY
MUTE
N.C.
IN1
V
CC
OUT1OUT1+
=25°C unless otherwise
amb
specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
CC
I
q
V
OS
P
O
THD Total Harmonic Distortion P
SVR Supply Voltage Rejection f = 100Hz VR = 0.5V 40 56 dB
A
MUTE
T
W
G
V
R
VT
MUTE
Supply Range 3 11 18 V
Total Quiescent Current 50 65 mA
Output Offset Voltage 120 mV
Output Power THD = 10% 6.3 7 W
= 1W 0.05 0.2 %
O
P
= 0.1W to 2W
O
f = 100Hz to 15kHz
Mute Attenuation 60 80 dB
Thermal Threshold 150
Closed LoopVoltage Gain 25 26 27 dB
Input Resistance 25 30 KΩ
i
Mute Threshold for VCC> 6.4V; VO= -30dB
for V
< 6.4V; VO= -30dB
CC
2.3
VCC/2
-1
2.9
V
CC
-0.75
/2
1%
4.1
V
/2
CC
-0.5
C
°
V
V
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TDA7266M
ELECTRICALCHARACTERISTICS
Symbol Parameter Test Condition Min. Typ. Max. Unit
VT
ST-BY
I
ST-BY
e
N
St-by Threshold 0.8 1.3 1.8 V
ST-BY current V6 = GND 100 µA
Total Output Noise Voltage A curve
APPLICATIONSUGGESTION
STAND-BYAND MUTE FUNCTIONS
(A) MicroprocessorApplication
In order to avoid annoying ”Pop-Noise” during
Turn-On/Off transients, it is necessary to guarantee the right St-by and mute signals sequence.
It is quite simple to obtain this function using a microprocessor(Fig.1 and 2).
At first St-by signal (from mP) goes high and the
voltage across the St-by terminal (Pin 7) startsto
increase exponentially. The external RC network
is intended to turn-onslowly the biasing circuits of
(Continued)
150
f = 20Hz to 20kHz
the amplifier, this to avoid ”POP” and ”CLICK” on
the outputs.
When this voltage reaches the St-by threshold
level, the amplifier is switched-onand the external
capacitors in series to the input terminals (C3,
C5) start to charge.
It’s necessaryto mantain the mute signal low until
the capacitors are fully charged, this to avoid that
the device goes in play mode causing a loud”Pop
Noise”on the speakers.
A delay of 100-200ms between St-by and mute
signals is suitable for a properoperation.
Figure 1: MicroprocessorApplication
V
µ
µP
IN1
ST-BY
MUTE
C1 0.22µF
R1 10K
C2
10µF
R2 10K
C4
1µF
S-GND
V
CC
4
7
9
Vref
68
+
-
-
+
133
1
OUT1+
2
OUT1-
PW-GND
C5
470µF
D98AU833A
C6
100nF
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