TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

6 of 29

NXP Semiconductors

TFA9810

Audio amplifier 2 x 12 W

In SLEEP mode the TFA9810 is not biased and has a very low supply current.

When the TFA9810 is set to OPERATING mode the device is started via the start-up

sequence, which provides a pop-free start-up behavior. After start-up the reference

voltages STAB are present and the outputs start switching.

8.3 Input comparators

The input stages have a differential input and are optimized for low noise and low offset.

This results in maximum flexibility in the application.

8.3.1 Operating in self-oscillating configuration

The inputs (IN1P, IN1N, IN2P, IN2N) of the comparators are internally set to a voltage level

high-ohmic.

8.3.2 Operating in open-loop configuration

No internal voltages are applied to the inputs. The input pins (IN1P, IN1N, IN2P, IN2N) are

8.4 Diagnostic

The DIAG output is an open-drain output. The maximum current is 2 mA. Whenever one

of the protections is triggered the DIAG output is activated low. The DIAG output refers to

8.5 Protections

Overtemperature, overcurrent, overvoltage, undervoltage, overdissipation sensors, and

window protection are included in the TFA9810. When one of these sensors exceeds its

threshold level either the output power stage is switched off and the outputs (OUT1N,

OUT1P, OUT2N, OUT2P) become floating, or the TFA9810 shuts down and starts up

immediately.

outputs become floating. The device will start switching again after 5

µs and when the

temperature is below 150

°C. This is thermal limitation without audible interruptions.

If the output current exceeds the maximum output current threshold level the output

becomes floating. The device will start switching again after 5

µs. This is current

limitation without audible interruptions.

Table 5.

Start-up

Interfacing

ENABLE [V]

Mode

ENABLE < 0.8 V

SLEEP

ENABLE > 3 V

OPERATING