TDF8599ATH Просмотр технического описания (PDF) - NXP Semiconductors.

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TDF8599ATH

I2C-bus controlled dual channel 135 W/4Ω, single channel 250 W/2Ω class-D power amplifier with load diagnostics

NXP Semiconductors. 

NXP Semiconductors

TDF8599A

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

001aai771

450

500

fosc (kHz)

OSCSET

TDF8599A

OSCIO

Master

OSCSET

Rosc

Cosc TDF8599A

fosc

R

OSCIO

Slave 1

Fig 5. Master and slave configuration

OSCSET

TDF8599A

OSCIO

Slave 2

001aak075

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 TDF8599A

is switched off by pulling down pin EN. If the external clock fails, the watchdog timer forces

the TDF8599A 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.

TDF8599A_2

Product data sheet

Rev. 02 — 30 June 2009

© NXP B.V. 2009. All rights reserved.

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