AN3956

Operation

Doc ID 022034 Rev 1

3/14

1

Operation

The TDA7491LP demonstration board specifications are as follows:

●

Power supply voltage range: 5 V to 14V

●

Number of channels: 2 BTL (bridge-tied load) stereo

●

Load impedance: 4

Ω to 8 Ω

●

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

●

Undervoltage protection (UVP): 4 V

1.1

Power supply

A single power supply is required to feed the TDA7491LP demonstration board via the

connector J2 (see Figure 2).

Connect the positive voltage of the 15 V/3 A DC power supply to the +Vcc pin and the

negative to GND.

Note:

Voltage range 5 V to 14 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 J7(Vcc) - J8(GND) (observe the polarity).

1.3

Inputs and outputs

1.

Connect the loads across the connectors J5-J6 (LEFT) and J9-J10 (RIGHT), the

specified impedance ranges from 4 to 8

Ω.

2.

Connect the analog audio inputs, single-ended, to the L-input and R-input RCA plugs

(J1).

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