TPA3003D2

SLOS406A − FEBRUARY 2003 − REVISED MARCH 2003

21

www.ti.com

APPLICATION INFORMATION

GND

SD = 0 V

Figure 28. Differential Output With FADE Terminal Held High

MUTE operation

The MUTE pin is an input for controlling the output state of the TPA3003D2. A logic high on this pin disables

the outputs. A logic low on this pin enables the outputs. This pin may be used as a quick disable or enable of

the outputs without a volume fade. Quiescent current is listed in the dc characteristics specification table. The

MUTE pin should never be left floating.

For power conservation, the SD pin should be used to reduce the quiescent current to the absolute minimum

level. The volume will fade, slowly increase or decrease, when leaving or entering the shutdown state if the

FADE terminal is held low. If the FADE terminal is held high, the outputs will transition very quickly. Refer to the

FADE operation section.

SD operation

minimum level during periods of nonuse for power conservation. The SD input terminal should be held high (see

specification table for trip point)during normal operation when the amplifier is in use. Pulling SD low causes the

outputs to mute and the amplifier to enter a low-current state. SD should never be left unconnected, because

amplifier operation would be unpredictable.

For the best power-off pop performance, the amplifier should be placed in the shutdown mode prior to removing

the power supply voltage.

selection of COSC and ROSC

The switching frequency is determined using the values of the components connected to ROSC (pin 20) and

COSC (pin 21) and may be calculated with the following equation: