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TDF8599B 数据表(PDF) 8 Page - NXP Semiconductors

部件名 TDF8599B
功能描述  I2C-bus controlled dual channel 43 W/4 W, single channel 85 W/1 W class-D power amplifier with load diagnostics
PDF  54 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

TDF8599B 数据表(HTML) 8 Page - NXP Semiconductors

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TDF8599B_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 29 July 2009
8 of 54
NXP Semiconductors
TDF8599B
I2C-bus controlled dual channel class-D power amplifier
The value of the resistor Rosc sets the clock frequency based on Equation 1:
(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 on page 6.
In Slave mode, an internal watchdog timer on pin OSCIO is triggered when the TDF8599B
is switched off by pulling down pin EN. If the external clock fails, the watchdog timer forces
the TDF8599B to switch off.
8.3.2 Spread spectrum mode (Master mode)
Spread spectrum mode is a technique of modulating the oscillator frequency with a slowly
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 6). When pin SSM is connected to pin AGND, Spread spectrum mode is disabled.
Fig 4.
Clock frequency as a function of Rosc
Fig 5.
Master and slave configuration
f
osc
12.45
10
9
×
R
osc
---------------------------- Hz
[]
=
fosc (kHz)
300
500
450
350
400
001aak224
20
30
10
40
50
Rosc
(k
Ω)
0
001aak218
OSCSET
OSCIO
Master
Cosc
R
fosc
Rosc
TDF8599B
OSCSET
OSCIO
Slave 1
TDF8599B
OSCSET
OSCIO
Slave 2
TDF8599B



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