AN4171

Operation

Doc ID 023710 Rev 1

3/14

1

Operation

The TDA7491MV demonstration board specifications are as follows:

●

Power supply voltage range: 5 V to 18 V

●

Number of channels: 1 BTL (Bridge-Tied Load)

●

Load impedance: 4

Ω to 8 Ω

●

Gain settings: 20 dB, 26 dB, 30 dB, 32 dB

●

Undervoltage protection (UVP): 4.5 V

1.1

Power supply

A single power supply is required to feed the TDA7491MV demonstration board via the

connector J2 (see Figure 2).

Connect the positive voltage of the 25 V/3 A DC power supply to the +Vcc pin and the

negative to GND.

Note:

Voltage range 5 V to 18 V = 3 A current capability

1.2

Demonstration board preparation

1.

Ensure that the power supply is switched OFF.

2.

Connect the regulated power supply, adjusted in the device operating range, to the

connector J2 (observe the polarity).

1.3

Inputs and outputs

1.

Connect the loads across the connectors J3 (LEFT) and J4 (RIGHT), the specified

impedance ranges from 6 to 8

Ω.

2.

Connect the analog audio inputs, either differential or single-ended, to the L-input and

R-input RCA plugs (J1).

Refer to Figure 2: Demonstration board connections on page 4.

Table 1.

Input configuration

Input configuration

Jumper J8 (right)

Jumper J9 (left)

Differential

Open

Open

Single-ended

Closed

Closed