ST TDA7266D User Manual
5W+5W DUAL BRIDGE AMPLIFIER
■ WIDE SUPPLY VOLTAGE RA NGE (3 .5 - 12V)
■ OUTPUT POWER
5+5W @THD = 10%, R
■ SINGLE SUPPLY
■ MINIMUM EXTERNAL COMPONENTS
– NO SVR CAPACITOR
– NO BOOT STRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
■ STAND-BY & MUTE FUNCTIONS
■ SHORT CIRCUIT PROTECTION
■ THERMAL OVERLOAD PROTECTION
DESCRIPTION
The TDA7266D is a dual bridge amplifier specially
= 8Ω, VCC = 9.5V
L
TDA7266D
PRELIMINARY DATA
TECHNOLOGY BI20II
PowerSO20 Slug Down
ORDERING NUMBER: TDA7266D
designed for LCD TV/Monitor, PC Motherboard, TV
and Portable Audio applications.
TEST AND APPLICATION CIRCUIT
V
CC
R1
47K
+5V
JP1
R2
47K
ST-BY
MUTE
IN1
R3 10K
IN2
R4 10K
PW-GND
C3 0.22µF
C4
10µF
C5 0.22µF
C6
1µF
S-GND
7
13
9
14
8
1
10
11
20
Vref
156
+
-
+
+
-
+
2
5
19
16
C1
470µFC2100nF
OUT1+
OUT1-
OUT2+
OUT2-
D02AU1407
C7
100nF
May 2003
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/13
TDA7266D
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Supply Voltage 20 V
s
Output Peak Current (internally limited) 1.5 A
Total Power Dissipation (T
Operating Temperature 0 to 70 °C
Storage and Junction Temperature -40 to 150 °C
= 70°C 25 W
amb
P
T
T
stg, Tj
V
I
O
tot
op
THERMAL DATA
Symbol Parameter Value Unit
R
th j-case
R
th j-amb
Notes: 1. See Application note AN668, available on WEB FR4 with 15 via holes and ground layer.
Thermal Resistance Junction-case 2.1 °C/W
Thermal Resistance Junction-ambient (on recomended PCB) note1 15 °C/W
PIN CONNECTION
2/13
PW GND
OUT1+
N.C.
N.C.
OUT1-
V
CC
IN1
MUTE
ST BY N.C.
1
2
3
4
5
6
7
8
9
PW GND 10
D02AU1408
20
19
18
17
16
15
14
13
12
11 PW GND
PW GND
OUT2+
N.C.
N.C.
OUT2-
CC
V
IN2SGND
TDA7266D
ELECTRICAL CHARACTERISTCS
(Refer to test circuit) VCC = 9.5V, RL = 8Ω, f = 1KHz, T
= 25°C unless
amb
otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
V
P
THD Total Harmonic Distortion PO = 1W 0.05 0.2 %
SVR Supply Voltage Rejection f = 100Hz, VR =0.5V 40 56 dB
CT Crosstalk 46 60 dB
A
MUTE
G
∆G
Supply Range 3.5 9.5 12 V
CC
Total Quiescent Current 50 60 mA
I
q
Output Offset Voltage 120 mV
OS
Output Power THD 10% 4.3 5 W
O
PO = 0.1W to 2W
1%
f = 100Hz to 15KHz
Mute Attenuation 60 80 dB
Thermal Threshold 150 °C
T
w
Closed Loop Voltage Gain 25 26 27 dB
V
Voltage Gain Matching 0.5 dB
V
R
Input Resistance 25 30 KΩ
i
VT
VT
I
MUTE
ST-BY
ST-BY
e
N
Mute Threshold for VCC > 6.4V; Vo = -30dB 2.3 2.9 4.1 V
for VCC < 6.4V; Vo = -30dB VCC/2-1VCC/2
-0.75
VCC/2
-0.5
V
St-by Threshold 0.8 1.3 1.8 V
St-by Current V6 = GND 100 µA
Total Output Voltage A Curve 150 µV
3/13
TDA7266D
APPLICATIVE SUGGESTIONS
STAND-BY AND MUTE FUNCTIONS
(A) Microprocessor Application
In order to avoid annoying "Pop-Noise" during Turn-On/Off transients, it is necessary to guarantee the right Stby and mute signals sequence.It is quite simple to obtain this function using a microprocessor (Fig. 1 and 2).
µ
At first St-by signal (from
ponentially. The external RC network is intended to turn-on slowly the biasing circuits of the amplifier, this to
avoid "POP" and "CLICK" on the outputs.
When this voltage reaches the St-by threshold level, the amplifier is switched-on and the external capacitors in
series to the input terminals (C1, C3) start to charge.
It's necessary to 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 proper operation.
Figure 1. Microprocessor Application
P) goes high and the voltage across the St-by terminal (Pin 9) starts to increase ex-
V
CC
C5
470µFC6100nF
OUT1+
ST-BY
IN1
C1 0.22µF
R1 10K
C2
10µF
7
9
+
-
156
2
µP
MUTE
IN2
R2 10K
PW-GND
S-GND
C3 0.22µF
C4
1µF
13
OUT1-
Vref
14
8
1
10
11
20
-
+
+
-
-
+
5
19
OUT2+
16
OUT2-
D02AU1409
4/13
Loading...