TDF8599B datasheet(16/54 Pages) NXP

16 / 54 page

NXP Semiconductors

TDF8599B

I2C-bus controlled dual channel 43 W/2 Ohm, single channel 85 W/1 Ohm class-D power amplifier with

load diagnostics

TDF8599B

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 2 — 23 August 2016

16 / 54

In I2C-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 TDF8599B in I2C-bus mode, pin

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

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

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

[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.

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