Protection Mechanisms in the TAS5601

Output Filter and Frequency Response

OUTA

OUTA

OUTB

TAS5601

• SCP (short-circuit protection, OCP) protects against shorts across the load, to GND, and to PVCC.

• OTP turns off the device if T

• UVP turns off the device if PVCC (typical) < 8.4 V

• OVP turns off the device if PVCC (typical) > 27.5 V

In single-ended (SE) applications, the dc blocking capacitor forms a high-pass filter with the speaker impedance.

The frequency response rolls of with decreasing frequency at a rate of 20 dB/decade. The cutoff frequency is

determined by

Table 1 shows some common component values and the associated cutoff frequencies:

Table 1. Common Filter Responses

Speaker Impedance (

Ω)

4

680

1000

2200

8

330

470

1000

For the best frequency response, a flat-passband output filter (second-order Butterworth) may be used. The

output filter components consist of the series inductor and capacitor to ground at the output pins. There are

several possible configurations, depending on the speaker impedance and whether the output configuration is

single-ended (SE) or bridge-tied load (BTL). Table 2 lists the recommended values for the filter components. It is

important to use a high-quality capacitor in this application. A rating of at least X7R is required.

Table 2. Recommended Filter Output Components

Output Configuration

Speaker Impedance (

Ω)

Filter Inductor (

µH)

Filter Capacitor (nF)

4

22

680

Single Ended (SE)

8

47

390

4

10

1500

Bridge Tied Load (BTL)

8

22

680

Figure 17. BTL Filter Configuration

Figure 18. SE Filter Configuration

The TAS5601 is a high-performance CMOS audio amplifier that requires adequate power-supply decoupling to

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