TDF8590TH NXP Semiconductors, TDF8590TH Datasheet - Page 5

• Manufacturer Part Number: TDF8590TH
• Description: The TDF8590TH is a high-efficiency class-D audio power amplifier with low powerdissipation for application in car audio systems
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDF8590TH_2
Product data sheet
6.3 Pulse width modulation frequency
The value of the RC time constant should be dimensioned for 500 ms. If the 100 F
capacitor is left out of the application the voltage on pin MODE will be applied with a much
smaller time constant, which might result in audible pop noises during start-up (depending
on DC output offset voltage and used loudspeaker).
In order to fully charge the coupling capacitors at the inputs, the amplifier will remain
automatically in Mute mode for approximately 150 ms before switching to Operating
mode. A complete overview of the start-up timing is given in
The output signal of the amplifier is a PWM signal with a switching frequency that is set by
an external resistor R
for the carrier frequency is between 300 kHz and 350 kHz. An external resistor R
30 k sets the frequency to 310 kHz.
Fig 4. Timing on mode selection input
0 V (SGND)
0 V (SGND)
V
V
MODE
2.5 V
MODE
5 V
5 V
ext(OSC)
Rev. 02 — 23 April 2007
standby
standby
2
connected between pins OSC and V
80 W SE (4 ) or 1
100 ms
100 ms
mute
50 ms
50 ms
160 W BTL (8 ) class-D amplifier
Figure
switching
operating
switching
operating
audio
audio
TDF8590TH
SSA
4.
001aad837
. An optimum setting
time
time
© NXP B.V. 2007. All rights reserved.
ext(OSC)
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