TDF8599B Просмотр технического описания (PDF) - NXP Semiconductors.
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TDF8599B Datasheet PDF : 54 Pages
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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:
f osc = 1----2---.-4-R--5--o---×s--c--1---0----9[Hz]
(1)
50
Rosc
(kΩ)
40
30
20
10
0
300
350
400
Fig 4. Clock frequency as a function of Rosc
001aak224
450
500
fosc (kHz)
OSCSET
TDF8599B
OSCIO
Master
OSCSET
Rosc
Cosc TDF8599B
fosc
R
OSCIO
Slave 1
Fig 5. Master and slave configuration
OSCSET
TDF8599B
OSCIO
Slave 2
001aak218
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.
TDF8599B_1
Product data sheet
Rev. 01 — 29 July 2009
© NXP B.V. 2009. All rights reserved.
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