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TDF8599 数据表(PDF) 9 Page - NXP Semiconductors

部件名 TDF8599
功能描述  I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier with load diagnostics
PDF  52 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

TDF8599 数据表(HTML) 9 Page - NXP Semiconductors

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TDF8599_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 13 November 2008
9 of 52
NXP Semiconductors
TDF8599
Class-D power amplifier with load diagnostics
The value of the resistor Rosc sets the carrier frequency based on the following formula:
(1)
In Master mode, Spread spectrum mode and frequency hopping can be enabled. In Slave
mode, phase staggering and phase lock operation can be selected. An external clock can
be used as the master-clock on pin OSCIO of the slave devices. When using an external
clock it must remain active during the shutdown sequence to ensure that all devices are
switched off and able to enter the off state as described in Section 8.2.
8.3.2 Spread spectrum mode (Master mode)
Spread spectrum mode is a technique of modulating the oscillator frequency with a slow
varying signal to broaden the switching spectrum, thereby reducing the spectral density of
the EMI. Connecting a capacitor (CSSM) to pin SSM enables Spread spectrum mode (see
Figure 7). When pin SSM is connected to pin AGND, Spread spectrum mode is disabled.
The capacitor on pin SSM (CSSM) sets the spreading frequency when Spread spectrum
mode is active. The current (ISSM) flowing in and out of pin SSM is typically 5 µA. This
gives a triangular voltage on pin SSM that sweeps around the voltage set by pin OSCSET
± 5 %. The voltage on pin SSM is used to modulate the oscillator frequency.
Fig 5.
Oscillator frequency as function of Rosc
Fig 6.
Master and slave configuration
f
osc
12.45
10
9
×
R
osc
---------------------------- Hz
[]
=
fosc (kHz)
300
500
450
350
400
001aai771
20
30
10
40
50
Rosc
(k
Ω)
0
001aai772
OSCSET
OSCIO
Master
Cosc
R
fosc
Rosc
TDF8599
OSCSET
OSCIO
Slave 1
TDF8599
OSCSET
OSCIO
Slave 2
TDF8599



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