TDF8599A datasheet(13/54 Pages) NXP

Part #	TDF8599A

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

PDF	54 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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13 / 54 page

TDF8599A_2

Product data sheet

Rev. 02 — 30 June 2009

13 of 54

NXP Semiconductors

TDF8599A

I2C-bus controlled dual channel class-D power ampliﬁer

8.4.2 Phase staggering (Slave mode)

In Slave mode with phase lock operation enabled, a phase shift with respect to the

incoming clock signal can be selected to distribute the switching moments over time. In

non-I2C-bus mode, 1

⁄

2 π phase shift can be programmed using pin MOD. In I

2C-bus mode,

ﬁve different phase shifts (1

⁄

4 π,

⁄

3 π,

⁄

2 π,

⁄

3 π,

⁄

4 π) can be selected using the I

2C-bus

bits (IB3[D1:D3]). See Table 8 for selection of the phase shift in non-I2C-bus mode with pin

MOD. An additional capacitor must be connected to pin SSM when 1

⁄

4 π phase shift is

used (see Figure 8). An example of using 1

⁄

2 π phase shift for BD modulation is shown in

Figure 12.

a. Phase switching cycle.

b. Inverted signal to the modulator.

Fig 11. BD modulation

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INxP

OUTxP

OUTxP, OUTxN

001aai782

INxN

OUTxN

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