TDF8599TH datasheet(13/52 Pages) NXP

No de pièce	TDF8599TH

Description	I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier with load diagnostics

PDF	52 Pages

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Fabricant	NXP [NXP Semiconductors]

Site Internet	http://www.nxp.com

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13 / 52 page

TDF8599_1

Product data sheet

Rev. 01 — 13 November 2008

13 of 52

NXP Semiconductors

TDF8599

Class-D power ampliﬁer with load diagnostics

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 Figure 9 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 9). An example of using 1

⁄

2 π phase shift for BD modulation is shown in

Figure 13.

a. Bridge half 1.

b. Bridge half 2 switched in the opposite phase to bridge half 1.

Fig 11. AD modulation

a. Phase switching cycle.

b. Inverted signal to the modulator.

Fig 12. BD modulation

001aai779

INxP

OUTxP

001aai780

INxN

OUTxN

001aai781

INxP

OUTxP

OUTxP, OUTxN

001aai782

INxN

OUTxN

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