Datasheet

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TDA7266D

May 2003

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

■ WIDE SUPPLY VOLTAGE RANGE (3.5 - 12V)

■ OUTPUT POWER

5+5W @THD = 10%, R

= 8Ω, V

= 9.5V

■ SINGLE SUPPLY

■ MINIMUM EXTERNAL COMPONENTS

– NO SVR CAPACITOR

– NO BOOTSTRAP

– 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

designed for LCD TV/Monitor, PC Motherboard, TV

and Portable Audio applications.

PowerSO20 Slug Down

ORDERING NUMBER: TDA7266D

PRELIMINARY DATA

5W+5W DUAL BRIDGE AMPLIFIER

TEST AND APPLICATION CIRCUIT

Vref

ST-BY

JP1

IN1

C3 0.22µF

156

D02AU1407

OUT1+

OUT1-

MUTE

IN2

C5 0.22µF

OUT2+

OUT2-

S-GND

PW-GND

470µF

100nF

10µF

47K

1µF

R3 10K

R4 10K

+5V

TECHNOLOGY BI20II

Summary of content (13 pages)

PAGE 1
TDA7266D 5W+5W DUAL BRIDGE AMPLIFIER PRELIMINARY DATA ■ ■ ■ ■ WIDE SUPPLY VOLTAGE RANGE (3.5 - 12V) OUTPUT POWER 5+5W @THD = 10%, R L = 8Ω, VCC = 9.5V TECHNOLOGY BI20II SINGLE SUPPLY MINIMUM EXTERNAL COMPONENTS – NO SVR CAPACITOR – NO BOOTSTRAP – NO BOUCHEROT CELLS – INTERNALLY FIXED GAIN PowerSO20 Slug Down ORDERING NUMBER: TDA7266D ■ STAND-BY & MUTE FUNCTIONS ■ SHORT CIRCUIT PROTECTION ■ THERMAL OVERLOAD PROTECTION designed for LCD TV/Monitor, PC Motherboard, TV and Portable Audio applications.
PAGE 2
TDA7266D ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Vs Supply Voltage 20 V IO Output Peak Current (internally limited) 1.5 A Ptot Total Power Dissipation (Tamb = 70°C 25 W Top Operating Temperature 0 to 70 °C -40 to 150 °C Value Unit Tstg, Tj Storage and Junction Temperature THERMAL DATA Symbol Parameter Rth j-case Thermal Resistance Junction-case 2.1 °C/W Rth j-amb Thermal Resistance Junction-ambient (on recomended PCB) note1 15 °C/W Notes: 1.
PAGE 3
TDA7266D ELECTRICAL CHARACTERISTCS (Refer to test circuit) VCC = 9.5V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified) Symbol VCC Iq Parameter Test Condition Supply Range Typ. Max. Unit 3.5 9.5 12 V 50 60 mA 120 mV Total Quiescent Current VOS Output Offset Voltage PO Output Power THD 10% Total Harmonic Distortion PO = 1W THD Min. 4.3 5 0.05 PO = 0.
PAGE 4
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). At first St-by signal (from µP) goes high and the voltage across the St-by terminal (Pin 9) starts to increase exponentially.
PAGE 5
TDA7266D Figure 2. Microprocessor Driving Signals +VS(V) +18 VIN (mV) VST-BY pin 9 1.8 1.3 0.8 VMUTE pin 8 4.1 2.9 2.3 Iq (mA) VOUT (V) OFF ST-BY PLAY MUTE MUTE ST-BY OFF D02AU1411 B) Low Cost Application In low cost applications where the mP is not present, the suggested circuit is shown in fig.3. The St-by and mute terminals are tied together and they are connected to the supply line via an external voltage divider.
PAGE 6
TDA7266D Figure 3. Stand-alone low-cost Application VCC C3 0.22µF R1 47K + IN1 ST-BY R2 47K 6 7 2 C1 470µF OUT1+ 5 OUT1- 19 OUT2+ 16 OUT2- 15 C2 100nF C7 100nF 9 C4 10µF S-GND 13 Vref C5 0.
PAGE 7
TDA7266D d Dissipating Copper Area: Dissipated Power: The max dissipated power happens for a THD near 1% and is given by the formula: 2 V CC P dmax ( W ) = 2 ⋅ ------------- + I q V CC 2 Rl π -----2 This gives for: Vcc = 9.5V, Rl = 8Ω ,Iq = 50mA a dissipated power of Pd = 5W. Thermal Protection: The thermal protection threshold is placed at a junction temperature of 150°C.
PAGE 8
TDA7266D Considering the dissipated power involved in the TDA7266D application that is in the range of 5W, as explained in a previous section, we suggest via holes ( see fig. 4). Using via holes a more direct thermal path is obtained from the slug to the ground layer.The number of vias is chosen accordingly to the desired performance (in our demonstration board we use 15 vias). In fig.4 is shown as an example the footprint to be used to create the vias. Figure 4.
PAGE 9
TDA7266D Figure 6. Distortion vs Frequency Figure 9. Stand-By attenuation vs Vpin 9 THD(%) 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 10 Vcc = 9.5 V Rl = 8 ohm 1 Pout = 100mW 0.1 Pout = 2W 0.010 100 1k 10k 20k Attenuation (dB) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 Vpin.7 (V) frequency (Hz) Figure 10. Quiescent Current vs Supply Voltage Figure 7. Gain vs Frequency Iq (mA) Level(dBr) 70 5.0000 4.0000 65 Vcc = 9.5V Rl = 8 ohm Pout = 1W 3.0000 60 2.
PAGE 10
TDA7266D Figure 12. THD+N vs Output Power Figure 13. THD+N vs Output Power THD(%) 10 THD(%) 5 10 5 Vcc=9.5V 2 2 Rl=8ohm 1 f=1KHz 1 Vcc=12V Rl=16 ohm f = 1KHz 0.5 0.5 0.2 0.1 0.2 0.05 0.1 0.02 100m 200m 300m 500m700m 1 Pout(W) 2 3 Figure 14. PC Board Component Layout 10/13 4 56 0.
PAGE 11
TDA7266D Figure 15. Evaluation Board Top Layer Layout Figure 16.
PAGE 12
TDA7266D DIM. mm MIN. TYP. A a1 inch MAX. MIN. TYP. 3.6 0.1 0.142 0.3 a2 0.004 0.012 3.3 0.130 a3 0 0.1 0.000 0.004 b 0.4 0.53 0.016 0.021 c 0.23 0.32 0.009 0.013 D (1) 15.8 16 0.622 0.630 0.386 D1 9.4 9.8 0.370 E 13.9 14.5 0.547 e 1.27 e3 E1 (1) 0.570 0.450 11.1 E2 0.429 0.437 2.9 0.114 E3 5.8 6.2 0.228 0.244 G 0 0.1 0.000 0.004 H 15.5 15.9 0.610 h L 0.626 1.1 0.8 JEDEC MO-166 0.043 1.1 N Weight: 1.9gr 0.050 11.43 10.
PAGE 13
TDA7266D Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice.