TDA7572 datasheet(50/64 Pages) STMICROELECTRONICS

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Diagnostics

TDA7572

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10.1.6

Power supply overcurrent

●

I2Cbus: The bit IsenTrip is set when the voltage between the ISSENP and ISSENM

pins exceeds the threshold. Also, the power control SCR is turned on (only if the

PassFETctrl register is set to one). IsenTrip is cleared by the W1TC procedure.

●

No I2Cbus: In addition the above, the non-latched version of IsenTrip register is

reported on the Address0/Fault_L pin. The value of PassFETctrl bit is determined by

the SDA/SCR_Enb pin, which is read at powerup:

●

NOTE: The Output current is monitored only when the output signal is in the +/-1.2V

(see offset detector specification) range for more then 100ms. When this condition is

reached a switch present between ISSENM and ISSENP is switched off. Normally this

switch shorts the ISSENM pin to the ISSENP, allowing external filter caps to used to

condition the current sense signal.

10.1.7

Fault handling

Note:

in legacy mode (no I2C bus) the Output over-current warning information is not reported on

the fault pin, while is present on the clipping detector output pin.

Table 33.

Fault handling

Fault

1st Threshold (Bus mode: I2C/No I2C)

2nd Threshold

DC offset

- Latch the offset bit

- Tristate the modulator

- Latch the offset bit and Fault pin

- Tristate the modulator

Die temperature

- Latch the Twarn bit

The SCR is activated if enabled

- Latch the Twarn bit

- Assert the fault pin

Output clipping

- Latch the Clip bit

- Assert the SCL_CLIP_L (if no DAC)

- Assert the Address0 (if DAC)

- Latch the Clip bit

- Assert SCL_CLIP_L

Output

overcurrent

- Latch the IsenTrip bit

- Clip the output current by modulator

injection

Cycle-to-cycle Current limiting is

activated.

If the cycle-by-cycle limitation is

present for more then four PWM

cycles the SCR is activated if the

SCR is enabled and the output FET

are tristated. If the SCR is disabled

the cycle-by cycle limitation keep

going.

- Latch the IsenTrip bit

- Clip the output current by modulator

injection

Power supply

overcurrent

- Latch the IoutTrip bit

- The SCR is activated if enabled

- Latch the IoutTrip bit

- Assert the Fault pin

- The SCR is activated if enabled

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