參數(shù)資料
型號(hào)： TDA8929T/N1,118
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 音頻／視頻放大
英文描述： 2 CHANNEL, AUDIO AMPLIFIER, PDSO24
封裝： PLASTIC, SO-24
文件頁(yè)數(shù)： 8/36頁(yè)
文件大?。?/td> 479K
代理商： TDA8929T/N1,118
2001 Dec 11
16
Philips Semiconductors
Preliminary specication
Controller class-D audio amplier
TDA8929T
14 SWITCHING CHARACTERISTICS
VP = ±25 V; Tamb =25 °C; measured in Fig.10; unless otherwise specied.
Notes
1. Frequency set with ROSC, according to the formula in the functional description.
2. For tracking the external oscillator has to switch around SGND + 2.5 V with a minimum voltage of VOSC(ext).
14.1
Minimum pulse width
The minimum obtainable pulse width of the PWM output signal of a class-D system, sets the maximum output voltage
swing after the demodulation filter and also the maximum output power. Delays in the power stages are the main cause
for the minimum pulse width being not equal to zero. The TDA8926 and TDA8927 power stages have a minimum pulse
width of tW(min) = 220 ns (typical). Using the TDA8929T controller, the effective minimum pulse is reduced by a factor of
two during clipping. For the calculation of the maximum output power at clipping the effective minimum pulse width during
clipping is 0.5tW(min).
For the practical useable minimum and maximum duty factor
(δ) which determines the maximum output power:
× 100% < δ <
× 100%
Using the typical values of the TDA8926 and TDA8927 power stages:
3.5% <
δ < 96.5%.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Switching frequency
fosc
oscillator frequency
ROSC = 30.0 k
309
317
329
kHz
ROSC =27k;
see Fig.12
360
kHz
fosc(r)
oscillator frequency range
note 1
210
600
kHz
VOSC
maximum voltage at pin OSC
frequency tracking
SGND + 12
V
VOSC(trip)
trip level at pin OSC for tracking
frequency tracking
SGND + 2.5
V
ftrack
frequency range for tracking
frequency tracking
200
600
kHz
VOSC(ext)
voltage at pin OSC for tracking
note 2
5
V
t
W(min)
f
osc
×
2
-------------------------------
1
t
W(min)
f
osc
×
2
-------------------------------
–
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