TDA75612LV View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

TDA75612LV

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

STMicroelectronics 

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Output DC offset detection

TDA75612LV

Look at the Figure 16. The power amplifier switches on and no input signal is applied. After

1 s the SVR is fully charged and the output dc voltage is set. The MCU sends the PLAY

command and the offset, on all the channels, is checked. If an offset bigger than 2 V is

detected, the power amplifier is switched off within 40 ms.

Figure 16. Power on sequence with a detected offset higher than 2 V

This action is pointed out on the I2C bus, bit DB2-D6. This flag is seen by the microcontroller

which can take proper actions.

A standby command (hardware or by I2C) can reset the power amplifier

5.2

Offset detection in normal operation

It is a diagnostics function which has to be performed with low-level output AC signal (or

Vin = 0).

The test is run with selectable time duration by microprocessor (from a "start" to a "stop"

command):

 Start = Last reading operation or setting IB1 - D5 - (OFFSET enable) to 1

 Stop = Actual reading operation

Excess offset is signalled out if persistent throughout the assigned testing time. This feature

is disabled if any overloads leading to activation of the short-circuit protection occurs in the

process.

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DocID025639 Rev 4

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