Service manual

SERVICE MANUAL

5 W Mono BTL Audio Amplifier with DC Volume Control TDA7056B

1. Features

· DC volume control

· Few external components

· Mute mode

· Thermal protection

· Short-circuit proof

· No switch-on and switch-off clicks

· Good overall stability

· Low power consumption

· Low HF radiation

· ESD protected on all pins.

2. General Description

The TDA7056B is a mono Bridge-Tied Load

(BTL) output amplifier with DC volume control.

It is designed for use in TV and monitors, but is

also suitable for battery-fed portable recorders

and radios.

The device is contained in a 9-pin medium

power package.

A Missing Current Limiter (MCL) is built in. The

MCL circuit is activated when the difference in

current between the output terminal of each

amplifier exceeds 100 mA (300 mA typ.). This

level of 100 mA allows for headphone

applications (single-ended).

3. Block Diagram

Fig. 24 Block Diagram.

4． Pinning

Table 10 Pinning

Symbol Pin Description

n.c. 1 Not connected

VP 2 Positive supply voltage

VI 3 Voltage input

GND1 4 Signal ground

VC 5 DC volume control

OUT+ 6 Positive output

GND2 7 Power ground

OUT- 8 Negative output

n.c. 9 Not connected

Fig. 25 Pin Configuration.

5. Refer to Table 21 about Functions and Service Data of the IC’s Pins.