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TDA7575 Datasheet, PDF (8/17 Pages) STMicroelectronics – MULTIFUNCTION DUAL BRIDGE POWER AMPLIFIER WITH INTEGRATED DIGITAL DIAGNOSTICS
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TDA7575
It is recommended to minimize the impedance on the board between OUT2 and the load in order to minimize
THD distortion. It is also recommended to control the maximum mismatch impedance between VCC pins
(PIN21/PIN22 respect to PIN33/PIN34) and between PWGND pins (PIN24/PIN25 respect to PIN30/PIN31),
mismatch that must not exceed a value of 20 mOhm.
With 1OHM feature settled the active input is IN2 (PIN17 and PIN18), therefore IN1 pins should be let floating.
It is possible to set the load capability acting on 1OHM pin as follows:
1OHM PIN (PIN15) < 1.5V: two channels mode (for a minimum load of 2 OHM)
1OHM PIN (PIN15) > 2.5V: one channel mode (for 1 OHM load).
IT IS TO REMEMBER THAT 1 0HM FUNCTION IS A HARDWARE SELECTION.
Therefore it is recommended to leave 1OHM PIN floating or shorted to GND to set the two channels mode con-
figuration, or to short 1OHM PIN to VCC to set the one channel (1OHM) configuration.
I2C Abilitation Setting
It is possible to disable the I2C interface by acting on I2C PIN (PIN16) and control the TDA7575 by means of the
usual ST-BY and MUTE pins. In order to activate or deactivate this feature, I2C PIN must be set as follows:
I2C PIN (PIN16) < 1.5V: I2C bus interface deactivated
I2C PIN (PIN16) > 2.5V: I2C bus interface activated
It is also possible to let I2C PIN floating to deactivate the I2C bus interface, or to short I2C PIN to VCC to activate
it.
In particular:
I2C ENABLED: I2C pin (PIN16) > 2.5V
– STD MODE: Vstby (PIN5) > 3.5V, IB2(D1)=0
– HE MODE: Vstby (PIN5) > 3.5V, IB2(D1)=1
– PLAY MODE: Vmute (pin 4) >3.5V, IB1 (D2) = 1
The amplifier can always be switched off by putting Vstby to 0V, but with I2C enabled it can be turn on only
through I2C (with Vstby>3.5V).
I2C DISABLED: I2C pin (PIN16) < 1.5V
– STD MODE: 3.5V < stby (PIN5) < 5
– HE MODE: Vstby (PIN5) > 7V
– PLAY MODE: Vmute (pin 4) >3.5V
For both STD and HE MODE the play/mute mode can be set acting on Vmute pin.
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