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TDF8599 Datasheet(PDF) 9 Page - NXP Semiconductors |
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TDF8599 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 52 page 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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