TS2012FC

Application information

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Figure 39.

Typical application for single-ended input configuration

4.9

Output filter considerations

The TS2012 is designed to operate without an output filter. However, due to very sharp

transients on the TS2012 output, EMI radiated emissions may cause some standard

compliance issues.

These EMI standard compliance issues can appear if the distance between the TS2012

outputs and loudspeaker terminal are long (typically more than 50 mm, or 100 mm in both

directions, to the speaker terminals). Because the PCB layout and internal equipment

device are different for each configuration, it is difficult to provide a one-size-fits-all solution.

However, to decrease the probability of EMI issues, there are several simple rules to follow:

●

Reduce, as much as possible, the distance between the TS2012 output pins and the

speaker terminals.

●

Use a ground plane for “shielding” sensitive wires.

●

Place, as close as possible to the TS2012 and in series with each output, a ferrite bead

with a rated current of minimum 2.5A and impedance greater than 50

Ω at frequencies

above 30MHz. If, after testing, these ferrite beads are not necessary, replace them by a

short-circuit.

●

Allow extra footprint to place, if necessary, a capacitor to short perturbations to ground

(see Figure 40).

TS2012

Left speaker

Right speaker

Cin

Cin

Left Input

Cin

Cin

Right Input

Standby Control

VCC

Cs1

1uF

VCC

Cs2

0.1uF

Gain Select

Control

Gain

Select

Oscillator

PWM

PWM

Gain

Select

Standby

Control

Protection

Circuit

Bridge

H

Bridge

H

Lin+

Lin-

G0

G1

Rin+

Rin-

STBYL

STBYR

Lout+

A3

A4

D3

D4

B3

B4

C1

D1

B2

C2

B1

A1

Lout-

Rout+

Rout-

PVCC

PGN D

AGND

AVCC