TDA8559T datasheet(8/32 Pages) PHILIPS

8 / 32 page

1997 Jun 27

Philips Semiconductors

Product speciﬁcation

Low-voltage stereo headphone ampliﬁer

TDA8559

APPLICATION INFORMATION

General

For applications with a maximum supply voltage of 6 V

(input mode LOW) the input pins need a DC path to ground

(see Figs 3 and 4). For applications with supply voltages in

the range from 6 to 18 V (input mode HIGH) the input DC

level is 0.5VP + 0.6 V. In this situation the input

configurations illustrated in Figs 5 and 6 have to be used.

The capacitor Cb is recommended for stability

improvement. The value may vary between

10 and 100 nF. This capacitor should be placed close to

the IC between pin 12 and pin 13.

Heatsink design

The standard application is stereo headphone

single-ended with a 32

Ω load impedance to buffer

(see Fig.9). The headphone amplifier can deliver a peak

output current of 150 mA into the load.

For the DIP16 envelope Rth j-amb = 52 K/W; the maximum

sine wave power dissipation for Tamb =25 °C is:

For Tamb =60 °C the maximum total power dissipation is:

For the SO16 envelope Rth j-amb = 105 K/W; the maximum

sinewave power dissipation for Tamb =25 °C is:

For Tamb =60 °C the maximum total power dissipation is:

2.4 W

150

–

----------------------

1.7 W

150

–

----------------------

1.2 W

150

–

105

----------------------

0.85 W

150

–

105

----------------------

Test conditions

Tamb =25 °C; unless otherwise specified: VP =3V,

f = 1 kHz, RL =32 Ω, Gain = 26 dB, low input mode,

band-pass filter: 22 Hz to 30 kHz. The total harmonic

distortion as a function of frequency was measured with

low-pass filter of 80 kHz. The quiescent current has been

measured without any load impedance.

In applications with coupling capacitors towards the load,

an electrolytic capacitor has to be connected to pin 4

(SVRR).

• The graphs for the single-ended application have been

measured with the application illustrated in Fig.9; input

configuration for input mode low (Fig.4) and input

configuration for input mode high (Fig.6).

• The graphs for the BTL application ‘input mode low’

have been measured with the application circuit

illustrated in Fig.11 and the input configuration

illustrated in Fig.4.

• The graphs for the line-driver application have been

measured with the application circuit illustrated in Fig.13

and the input configuration illustrated in Fig.6; input

mode high.

Input conﬁgurations

The IC can be applied in two ways, ‘input mode low’ and

‘input mode high’. This can be selected by the input mode

at pin 8:

1. Input mode low: pin 8 floating:

The DC level of the input pins has to be between 0 V

and (VP − 1.8 V). A DC path to ground is needed.

The maximum output voltage is approximately

2.1 V (RMS). Input configurations illustrated in

Figs 3 and 4 should be used.

2. Input mode high: pin 8 is connected to VP:

This mode is intended for supply voltages >6 V. It can

deliver a maximum output voltage of approximately

6 V (RMS) at THD = 0.5%. The DC voltage level of the

input pins is (0.5VP + 0.6 V). Coupling capacitors are

necessary. Input configurations illustrated in

Figs 5 and 6 should be used.

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