TDF8599ATH/N2/S6CY Datasheet TDF8599ATH/N2,518, TDF8599ATH/N2,512, TDF8599ATH/N2/S6CY | P16-P18

Product data sheet Rev. 02 — 30 June 2009 16 of 54

NXP Semiconductors

TDF8599A

C-bus controlled dual channel class-D power ampliﬁer

• During the start-up sequence:

– When the TDF8599A is switched from standby to mute (t

d(stb-mute)

). When a short

circuit on one of the output terminals (i.e. between V

or GND) is detected, the

start-up procedure is interrupted and the TDF8599A waits for open circuit outputs.

No large currents ﬂow in the event of a short circuit to the supply lines because the

check is performed before the power stages are enabled.

• During operation:

– A short to one of the supply lines trips OCP causing the ampliﬁer channel to

shutdown. After 50 ms the ampliﬁer channel restarts and WP is activated.

However, the corresponding ampliﬁer channel will not start-up until the supply line

short circuit has been removed.

8.5.5 DC offset protection

DC Protection (DCP) is activated when the DC content in the demodulated output voltage

exceeds a set threshold (typically 2 V). DCP is active in both Mute mode and Operating

mode. Figure 14 shows how false triggering of the DCP by low frequencies in the audio

signal is prevented using the external capacitor (C

) to generate a cut-off frequency.

In I

C-bus mode, DC offsets generate a voltage shift around the bias voltage. When the

voltage shift exceeds threshold values, the offset alarm bit DB1[D2] is set and if bit

IB1[D7] is not set, diagnostic information is also given. Any detected offset shuts down

both channels when bit IB2[D7] is not set. To restart the TDF8599A in I

C-bus mode, pin

EN must be toggled or DCP disabled by connecting pin DCP to pin AGND.

Fig 14. DC offset protection and diagnostic output

001aak078

OUT1P

OUT1N

V to I

OUT2P

OUT2N

DCP

DIAG

switch off channels

IB1[D6] IB2[D6]

V to I

ref

DB1[D2]

IB1[D7]

IB2[D7]

50 kΩ

Product data sheet Rev. 02 — 30 June 2009 17 of 54

NXP Semiconductors

TDF8599A

C-bus controlled dual channel class-D power ampliﬁer

In non-I

C-bus mode, when an offset is detected, DCP always gives diagnostic

information on pin DIAG and shuts down both channels.

Connecting a capacitor between pins DCP and AGND enables DC offset protection.

Connecting pin DCP to pin AGND disables DCP in both I

C-bus and non-I

C-bus mode.

8.5.6 Supply voltages

UnderVoltage Protection (UVP) is activated when the supply voltage drops below the UVP

threshold. UVP triggers the UVP circuit causing the system to ﬁrst mute and then stop

switching. When the supply voltage rises above the threshold level, the system restarts.

OverVoltage Protection (OVP) is activated when the supply voltage exceeds the OVP

threshold. The OVP (or load dump) circuit is activated and the power stages are

shutdown.

An overview of all protection circuits and the ampliﬁer states is given in Table 10.

8.5.7 Overview of protection circuits and ampliﬁer states

[1] When fault is removed.

[2] Ampliﬁer gain depends on the junction temperature and size of the heat sink.

[3] TFP inﬂuences restart timing depending on heat sink size.

[4] Shorted load causes a restart of the channel every 50 ms.

[5] Latched protection is reset by toggling pin EN or by disabling DCP in I

C-bus mode.

[6] In I

C-bus mode deep supply voltage drops will cause a Power-On Reset (POR). The restart requires an

C-bus command.

8.6 Diagnostic output

8.6.1 Diagnostic table

The diagnostic information for I

C-bus mode and non-I

C-bus mode is shown in Table 11.

The instruction bitmap and data bytes are described in Table 14 and Table 15.

Pins DIAG and CLIP have an open-drain output which must have an external pull-up

resistor connected to an external voltage. Pins CLIP and DIAG can show both ﬁxed and

C-bus selectable information.

Table 10. Overview of TDF8599A protection circuits and ampliﬁer states

Protection circuit name Ampliﬁer state

Complete

shutdown

Channel

shutdown

Restart

[1]

TFP N

[2]

[3]

OTP Y N Y

[3]

OCP N Y Y

[4]

WP N Y Y

DCP Y N N

[5]

UVP Y N Y

[6]

OVP Y N Y

Product data sheet Rev. 02 — 30 June 2009 18 of 54

NXP Semiconductors

TDF8599A

C-bus controlled dual channel class-D power ampliﬁer

Pin DIAG goes LOW when a short circuit to one of the ampliﬁer outputs occurs. The

microprocessor reads the failure information using the I

C-bus. The I

C-bus bits are set

for a short circuit. These bits can be reset with the I

C-bus read command.

Even after the short has been removed, the microprocessor knows what was wrong after

reading the I

C-bus. Old information is read when a single I

C-bus read command is

used. To read the current information, two read commands must be sent, one after

another.

When selected, pin DIAG gives the current diagnostic information. Pin DIAG is released

instantly when the failure is removed, independent of the I

C-bus latches.

When OCP is triggered, the open-drain DIAG output is activated. The diagnostic output

signal during different short circuit conditions is illustrated in Figure 15.

8.6.2 Load identiﬁcation (I

C-bus mode only)

8.6.2.1 DC load detection

DC load detection is only available in I

C-bus mode and is controlled using bit IB2[D2].

The default setting is logic 0 for bit IB2[D2] which disables DC load detection. DC load

detection is enabled when bit IB2[D2] = 1. Load detection takes place before the class-D

ampliﬁer output stage starts switching in Mute mode and the start-up time from Standby

mode to Mute mode is increased by t

det(DCload)

(see Figure 16).

Table 11. Available data on pins DIAG and CLIP

Diagnostic I

C-bus mode Non-I

C-bus mode

Pin DIAG Pin CLIP Pin DIAG Pin CLIP

Power-on reset yes yes yes yes

UVP or OVP yes no yes no

Clip detection no selectable no yes

Temperature pre-warning no selectable no yes

OCP/WP yes no yes no

DCP selectable no yes no

OTP yes no yes no

Fig 15. Diagnostic output for short circuit conditions

001aai786

AMPLIFIER

RESTART

shorted load

pull up V

AGND = 0 V

≈50 ms

≈50 ms≈50 ms

RESTART

short to GND or V

line

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TDF8599ATH/N2/S6CY

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IC POWER AMP CLASS D I2C 36HSOP

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TDF8599ATH/N2/S6CY

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