tda2500 Tripath Technology Inc., tda2500 Datasheet - Page 26

Manufacturer Part Number

tda2500

Description

Stereo Class-t Digital Audio Amplifier Driver Using Digital Power Processing Dpp

Manufacturer

Tripath Technology Inc.

Datasheet

1.TDA2500.pdf (29 pages)

inserted. This scales the amplifier feedback properly for the TA0104A supply range and results

in the same gain as a standard TA0104A design. The resulting gain equation is as follows.

The modifications needed for channel 1 are shown in Figure 7.

Figure 7: Feedback Structure for TA0104A Emulation

Add the resistor dividers to both VLOW and VHIGH as shown in Figure 8. These resistors

lower the supply range of the TDA2500 to roughly +/-60V to +/-93V, with a maximum

undervoltage turn on voltage of +/-55V, assuming worse case tolerances. It should be noted

that the TA0104A voltage specification of +/-55V to +/-92V were the undervoltage and

overvoltage turn on points, not the inner hysteresis band. The “hot side” of the VNN and VPP

resistors should be connected to pin 24 and pin 23, respectively. Surface mount types can be

used (1/8W is fine) though the resistors need to 1% tolerance. Please note that the

recommended resistor values are slightly different than those used in the TA0104A. This was

done intentionally to produce a symmetrical supply range for VPP and VNN.

Processing

Modulation

4.99k

20k

1/2 TDA2500

1.02K

AGND

19.7k

1020

1.02K

1.0K

2.02

GNDKELVIN1

FDBKN1

T r i p a t h T e c h n o l o g y , I n c . - T e c h n i c a l I n f o r m a t i o n

18.7K 1/4W

TDA2500 – KL/ Rev. 0.9/05.05

OUTPUT 1

GROUND