TDF8599BTH datasheet(19/54 Pages) NXP

Part #	TDF8599BTH

Description	I2C-bus controlled dual channel 43 W/4 W, single channel 85 W/1 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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19 / 54 page

TDF8599B_1

Product data sheet

Rev. 01 — 29 July 2009

19 of 54

NXP Semiconductors

TDF8599B

I2C-bus controlled dual channel class-D power ampliﬁer

The capacitor connected to pin SEL_MUTE (see Figure 3 on page 6) is used to create an

inaudible current test pulse, drawn from the positive ampliﬁer output. The diagnostic

‘speaker load’ (or ‘open load’), based on the voltage difference between pins OUTxP and

OUTxN is shown in Figure 18.

Remark: DC load detection identiﬁes a short circuited speaker as a valid speaker load.

OCP detection, using byte DB1[D3] for channel 1 and byte DB2[D3] for channel 2,

performs diagnostics on shorted loads. However, the diagnostics are performed after the

DC load detection cycle has ﬁnished and once the ampliﬁer is in Operating mode.

The result of the DC load detection is stored in bits DB1[D4] and DB2[D4].

Fig 16. DC load detection circuit

Fig 17. DC load detection procedure

Fig 18. DC load detection limits

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PWM

CONTROL

DRIVER

HIGH

PGND1

OUTN

OUTP

DRIVER

LOW

PWM

CONTROL

DRIVER

HIGH

PGND2

DRIVER

LOW

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out (V)

tdet(DCload)

td(stb-mute)

t (s)

out

−

out+

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Ω

Ω 350 Ω

SPEAKER LOAD

OPEN LOAD

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