TDA7293V STMicroelectronics, TDA7293V Datasheet - Page 7

• Manufacturer Part Number: TDA7293V
• Description: IC AMP AUDIO 100W AB MULTIWATT15
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TDA7293V

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 100W x 1 @ 4 Ohm
• Voltage - Supply: ±12 V ~ 50 V
• Features: Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: Multiwatt-15 (Vertical, Bent and Staggered Leads)
• Product: Class-AB
• Output Power: 100 W
• Available Set Gain: 80 dB
• Thd Plus Noise: 0.005 %
• Operating Supply Voltage: +/- 60 V
• Supply Current: 10 A
• Maximum Power Dissipation: 50000 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Audio Load Resistance: 8 Ohms
• Dual Supply Voltage: +/- 15 V, +/- 18 V, +/- 24 V, +/- 28 V
• Input Bias Current (max): 1 uA
• Input Offset Voltage: 10 mV
• Input Signal Type: Single
• Minimum Operating Temperature: 0 C
• Output Signal Type: Single
• Supply Type: Dual
• Amplifier Class: AB
• No. Of Channels: 1
• Supply Voltage Range: ± 12V To ± 50V
• Load Impedance: 4ohm
• Operating Temperature Range: 0°C To +70°C
• Amplifier Case Style: Multiwatt15
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2170-5

TDA7293
3
3.1
Circuit description
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 phoenomenon. It limits the safe
operating area (SOA) of the power devices, and, as a consequence, the maximum
attainable output power, especially in presence of highly reactive loads.
Moreover, full exploitation of the SOA translates into a substantial increase in circuit and
layout complexity due to the need of sophisticated protection circuits.
To overcome these substantial drawbacks, the use of power MOS devices, which are
immune from secondary breakdown is highly desirable.
The device described has therefore been developed in a mixed bipolar-MOS high voltage
technology called BCDII 100/120.
Output Stage
The main design task in developping a power operational amplifier, independently of the
technology used, is that of realization of the output stage.
The solution shown as a principle shematic by Fig6 represents the DMOS unity - gain output
buffer of the TDA7293.
Figure 4.
This large-signal, high-power buffer must be capable of handling extremely high current and
voltage levels while maintaining acceptably low harmonic distortion and good behaviour
over frequency response; moreover, an accurate control of quiescent current is required.
A local linearizing feedback, provided by differential amplifier A, is used to fullfil the above
requirements, allowing a simple and effective quiescent current setting. Proper biasing of
the power output transistors alone is however not enough to guarantee the absence of
crossover distortion.
Schematic of a DMOS unity-gain buffer
Doc ID 6744 Rev 8
Circuit description
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