Philips TDA8559T

Product data sheets Rev. 03 — 15 May 2006 14 of 36

Philips Semiconductors TDA8559T

Low-voltage stereo headphone ampliﬁer

13.5 Standby/mute

1. The Standby mode (V1< 0.5 V) is intended for power saving purpose. Then the total

quiescent current is < 10 µA.

2. To avoid ‘pop-noise’ during switch-on or switch-off the IC can be muted (V7< 0.5 V).

This can be achieved by a ‘soft-mute’ circuit or by direct control from a microcontroller.

13.6 Application 1: SE with loudspeaker capacitor

The value of capacitor Cr inﬂuences the behavior of the Supply Voltage Ripple Rejection

(SVRR) at low frequencies; increasing the value of Cr increases the performance of the

SVRR; see Figure 8.

13.7 Application 2: SE to buffer (without loudspeaker capacitor)

This is the basic headphone application. The advantage of this application with respect to

application 1, is that it needs only one external component (Cb) in the event of stability

problems; see Figure 9.

13.8 Application 3: Improved SE to buffer (without loudspeaker capacitor)

This application is an improved conﬁguration of application 2. The distinction between the

two is connecting the loads in opposite phase. This lowers the average current through

the SE buffer. It should be noted that a headphone cannot be used because the load

requires ﬂoating terminals; see Figure 10.

13.9 Application 4: Bridge tied load mono ampliﬁer

This conﬁguration delivers four times the output power of the SE application with the same

supply and load conditions. The capacitor Cr is not required; see Figure 11.

13.10 Application 5: Line driver application

The TDA8559T delivers a virtual rail-to-rail output voltage and is also usable in a low

voltage environment, as a line driver. In this application the input needs a DC path to

ground, input conﬁgurations illustrated in Figure 3 and Figure 4 should be used. The value

of capacitor Cr inﬂuences the behavior of the SVRR at low frequencies; increasing the

value of Cr increases the performance of the SVRR; see Figure 12.

13.11 Application 6: Line driver application

The TDA8559T delivers a virtual rail-to-rail output voltage. Because the input mode has to

be high, the input conﬁgurations illustrated in Figure 5 and Figure 6 should be used. This

application can also be used for headphone application, however, due to the limited output

current and the limited output power at the headphone, series resistors have to be used

between the output pins and the load; see Figure 13.

The value of capacitor Cr inﬂuences the behavior of the SVRR at low frequencies;

increasing the value of Cr increases the performance of the SVRR.