Application information

TS2012

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DocID14236 Rev 2

4.9

Single-ended input configuration

It is possible to use the TS2012 in a single-ended input configuration. However, input

coupling capacitors are mandatory in this configuration. The schematic diagram in Figure 45

shows a typical single-ended input application.

Figure 45. Typical application for single-ended input configuration

4.10

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 the loudspeaker terminal are long (typically more than 50 mm or 100 mm, in

both directions, to the speaker terminals). As 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, the following simple rules should be

followed:

•

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 minimum rated current of 2.5 A and an impedance greater than 50

Ω at

frequencies above 30 MHz. 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 46).

VCC

CsL

TS2012

Gain

Select

Gain

Select

Standby

Control

PWM

H

Bridge

PWM

H

Bridge

Oscillator

LIN +

LIN -

RIN -

RIN +

G0

G1

STBY L

STBY R

LOUT+

LOUT-

ROUT+

ROUT-

Left speaker

Right speaker

Cin

Cin

Left Input

Cin

Cin

Right Input

Standby Control

VCC

CsR

VCC

Cs

100nF

Gain Select

Control

1 F

μ

1 F

μ