TDA75610SLV-ZSX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TDA75610SLV-ZSX

4 x 45 W power amplifier with full I2C diagnostics, high efficiency and low voltage operation

STMicroelectronics 

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TDA75610SLV

8.2

High efficiency introduction

Thanks to its operating principle, the TDA75610SLV obtains a substantial reduction of

power dissipation from traditional class-AB amplifiers without being affected by the massive

radiation effects and complex circuitry normally associated with class-D solutions.

The high efficiency operating principle is based on the use of bridge structures which are

connected by means of a power switch. In particular, as shown in Figure 1, Ch1 is linked to

Ch2, while Ch3 to Ch4. The switch, controlled by a logic circuit which senses the input

signals, is closed at low volumes (output power steadily lower than 2.5 W) and the system

acts like a "single bridge" with double load. In this case, the total power dissipation is a

quarter of a double bridge.

Due to its structure, the highest efficiency level can be reached when symmetrical loads are

applied on channels sharing the same switch.

Figure 38. High efficiency - basic structure

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When the power demand increases to more than 2.5 W, the system behavior is switched

back to a standard double bridge in order to guarantee the maximum output power, while in

the 6 V start-stop devices the High Efficiency mode is automatically disabled at low VCC

(7.3 V ±0.3 V). No need to re-program it when VCC goes back to normal levels.

In the range 2-4 W (@ VCC = 14.4 V, RL = 4Ω), with the High Efficiency mode, the dissipated

power gets up to 50 % less than the value obtained with the standard mode.

28/42

DocID025599 Rev 6

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