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TDA8950_1 © NXP B.V. 2008. All rights reserved.
Preliminary data sheet Rev. 01 — 9 September 2008 14 of 39
NXP Semiconductors
TDA8950
2 × 150 W class-D power amplifier
12. Dynamic characteristics
12.1 Switching characteristics
[1] When using an external oscillator, the f
osc(ext)
frequency (500 kHz minimum, 900 kHz maximum) will result
in a PWM frequency f
track
(250 kHz minimum, 450 kHz maximum) due to the internal clock divider. See
Section 8.2.
Fig 8. Behavior of mode selection pin MODE
Standby Mute On
5.5
coa021
V
MODE
(V)
4.23.02.20.80
V
O
(V)
V
O(offset)(mute)
V
O(offset)(on)
slope is directly related to the time-constant
of the RC network on the MODE pin
Table 8. Dynamic characteristics
V
P
=
±
35 V; T
amb
= 25
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Internal oscillator
f
osc(typ)
typical oscillator
frequency
R
OSC
= 30.0 kΩ 325 345 365 kHz
f
osc
oscillator frequency 250 - 450 kHz
External oscillator or frequency tracking
V
OSC
voltage on pin OSC SGND + 4.5 SGND + 5 SGND + 6 V
V
trip(OSC)
trip voltage on pin
OSC
- SGND + 2.5 - V
f
track
tracking frequency
[1]
250 - 450 kHz