TDF8599BTH datasheet(17/54 Pages) NXP

17 / 54 page

TDF8599B_1

Product data sheet

Rev. 01 — 29 July 2009

17 of 54

NXP Semiconductors

TDF8599B

I2C-bus controlled dual channel class-D power ampliﬁer

In non-I2C-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 I2C-bus and non-I2C-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 I2C-bus mode.

[6]

In I2C-bus mode deep supply voltage drops will cause a Power-On Reset (POR). The restart requires an

I2C-bus command.

8.6 Diagnostic output

8.6.1 Diagnostic table

The diagnostic information for I2C-bus mode and non-I2C-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

I2C-bus selectable information.

Table 10.

Overview of TDF8599B protection circuits and ampliﬁer states

Protection circuit name

Ampliﬁer state

Complete

shutdown

Channel

shutdown

Restart[1]

TFP

N[2]

Y[3]

OTP

Y[3]

OCP

Y[4]

DCP

N[5]

UVP

Y[6]

OVP

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