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TDA8588BJ Datasheet(PDF) 48 Page - NXP Semiconductors

Part No. TDA8588BJ
Description  I2C-bus controlled 4 x 50 Watt power amplifier and multiple voltage regulator
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

 48 page
background image
2004 Feb 24
48
Philips Semiconductors
Product specification
I2C-bus controlled 4
× 50 Watt power
amplifier and multiple voltage regulator
TDA8588J; TDA8588xJ
Beep input circuit
Beep input circuit to amplify the beep signal from the microcontroller to all 4 amplifiers (gain = 0 dB). Note that this circuit
will not affect amplifier performance.
Noise
The outputs of regulators 1 to 5 are designed to give very low noise with good stability. The noise output voltage depends
on output capacitor Co. Table 11 shows the affect of the output capacitor on the noise figure.
Table 11 Regulator noise figures
Note
1. Measured in the frequency range 20 Hz to 80 kHz.
Stability
The regulators are made stable by connecting capacitors to the regulator outputs. The stability can be guaranteed with
almost any output capacitor if its Electric Series Resistance (ESR) stays below the ESR curve shown in Fig.32. If an
electrolytic capacitor is used, its behaviour with temperature can cause oscillations at extremely low temperature.
Oscillation problems can be avoided by adding a 47 nF capacitor in parallel with the electrolytic capacitor. The following
example describes how to select the value of output capacitor.
REGULATOR
NOISE FIGURE (
µV) at IREG = 10 mA; note 1
Co =10 µFCo =47 µFCo = 100 µF
1
225
195
185
2
750
550
530
3
120
100
95
4
225
195
185
5
320
285
270
mdb589
From
microcontroller
1.7 k
0.22
µF
100
2.2
µF
47 pF
TDA8588
ACGND
Fig.31 Application diagram for beep input.




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