Datasheet

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TDA7295

80V - 80W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

VERY HIGH OPERATING VOLTAGE RANGE

(

40V)

DMOS POWER STAGE

HIGH OUTPUT POWER (UP TO 80W MUSIC

POWER)

MUTING/STAND-BY FUNCTIONS

NO SWITCH ON/OFF NOISE

NO BOUCHEROT CELLS

VERY LOW DISTORTION

VERY LOW NOISE

SHORT CIRCUIT PROTECTION

THERMAL SHUTDOWN

DESCRIPTION

The TDA7295 is a monolithic integrated circuit in

Multiwatt15 package, intended for use as audio

class AB amplifier in Hi-Fi field applications

(Home Stereo, self powered loudspeakers, Top-

class TV). Thanks to the wide voltage range and

to the high out current capability it is able to sup-

ply the highest power into both 4

Ω

and 8

Ω

loads

even in presence of poor supply regulation, with

high Supply Voltage Rejection.

The built in muting function with turn on delay

simplifies the remote operation avoiding switching

on-off noises.

April 2003

IN- 2

680Ω

22µF

C1 470nF

IN+

R1 22K

2.7Ω

C10

100nF

R3 22K

MUTE

STBY

VSTBY

IN+MUTE

MUTE

STBY

R4 22K

THERMAL

SHUTDOWN

S/C

PROTECTION

R5 10K

C3 10µF C4 10µF

STBY-GND

22µF

713

158

-Vs -PWVs

BOOT-

STRAP

OUT

+PWVs+Vs

C9 100nF C8 1000µF

-Vs

D93AU011

+VsC7 100nF C6 1000µF

Note: The Boucherot cell R6, C10, normally not necessary for a stable operation it could

be needed in presence of particular load impedances at V

<±25V.

Figure 1: Typical Application and Test Circuit

Multiwatt 15

ORDERING NUMBER:

TDA7295

MULTIPOWER BCD TECHNOLOGY

1/13

Summary of content (13 pages)

PAGE 1
TDA7295 ® 80V - 80W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY VERY HIGH OPERATING VOLTAGE RANGE (±40V) DMOS POWER STAGE HIGH OUTPUT POWER (UP TO 80W MUSIC POWER) MUTING/STAND-BY FUNCTIONS NO SWITCH ON/OFF NOISE NO BOUCHEROT CELLS VERY LOW DISTORTION VERY LOW NOISE SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN DESCRIPTION The TDA7295 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Topclass TV
PAGE 2
TDA7295 PIN CONNECTION (Top view) BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Supply Voltage Output Peak Current Ptot Power Dissipation Tcase = 70°C Top Operating Ambient Temperature Range Tstg, Tj 2/13 Parameter VS IO Storage and Junction Temperature Value Unit ±40 6 V A 50 W 0 to 70 °C 150 °C
PAGE 3
TDA7295 THERMAL DATA Symbol Rth j-case Description Thermal Resistance Junction-case Value Unit 1.5 °C/W Max ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit VS = ±30V, RL = 8Ω, GV = 30dB; Rg = 50 Ω; Tamb = 25°C, f = 1 kHz; unless otherwise specified. Symbol Parameter VS Iq Operating Supply Range Quiescent Current Ib Test Condition Min. Typ. Max.
PAGE 4
TDA7295 Figure 2: P.C.B. and components layout of the circuit of figure 1. (1:1 scale) Note: The Stand-by and Mute functions can be referred either to GND or -VS. On the P.C.B. is possible to set both the configuration through the jumper J1.
PAGE 5
TDA7295 APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1) The recommended values of the external components are those shown on the application circuit of Figure 1. Different values can be used; the following table can help the designer.
PAGE 6
TDA7295 TYPICAL CHARACTERISTICS (Application Circuit of fig 1 unless otherwise specified) Figure 3: Output Power vs. Supply Voltage. Figure 4: Distortion vs. Output Power Figure 5: Output Power vs. Supply Voltage Figure 6: Distortion vs. Output Power Figure 7: Distortion vs. Frequency Figure 8: Distortion vs.
PAGE 7
TDA7295 TYPICAL CHARACTERISTICS (continued) Figure 9: Quiescent Current vs. Supply Voltage Figure 10: Supply Voltage Rejection vs. Frequency Figure 11: Mute Attenuation vs. Vpin10 Figure 12: St-by Attenuation vs. Vpin9 Figure 13: Power Dissipation vs. Output Power Figure 14: Power Dissipation vs.
PAGE 8
TDA7295 INTRODUCTION In consumer electronics, an increasing demand has arisen for very high power monolithic audio amplifiers able to match, with a low cost the performance obtained from the best discrete designs. The task of realizing this linear integrated circuit in conventional bipolar technology is made extremely difficult by the occurence of 2nd breakdown phenomenon.
PAGE 9
TDA7295 Figure 16: Turn ON/OFF Suggested Sequence +Vs (V) +35 -35 -Vs VIN (mV) VST-BY PIN #9 (V) VMUTE PIN #10 (V) 5V 5V IP (mA) VOUT (V) OFF ST-BY PLAY MUTE ST-BY OFF MUTE D93AU013 In addition to the overload protection described above, the device features a thermal shutdown circuit which initially puts the device into a muting state (@ Tj = 145 oC) and then into stand-by (@ Figure 17: Single Signal ST-BY/MUTE Control Circuit MUTE MUTE/ ST-BY STBY 20K 10K 30K 1N4148 10µF 10µF D93AU014 T
PAGE 10
TDA7295 BRIDGE APPLICATION Another application suggestion is the BRIDGE configuration, where two TDA7295 are used, as shown by the schematic diagram of figure 25. In this application, the value of the load must not be lower than 8 Ohm for dissipation and current capability reasons. A suitable field of application includes HI-FI/TV subwoofers realisations. The main advantages offered by this solution are: - High power performances with limited supply voltage level.
PAGE 11
TDA7295 Figure 19: Frequency Response of the Bridge Application Figure 20: Distortion vs. Output Power Figure 21: Distortion vs.
PAGE 12
TDA7295 mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 D 0.063 1 0.039 E 0.49 0.55 0.019 0.022 F 0.66 0.75 0.026 0.030 G 1.02 1.27 1.52 0.040 0.050 0.060 G1 17.53 17.78 18.03 0.690 0.700 0.710 H1 19.6 0.772 H2 L 20.2 0.795 21.9 22.2 22.5 0.862 0.874 0.886 L1 21.7 22.1 22.5 0.854 0.870 0.886 L2 17.65 18.1 0.695 L3 17.25 17.5 17.75 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 0.713 L7 2.65 2.
PAGE 13
TDA7295 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. Specification mentioned in this publication are subject to change without notice.