TDF8599TH datasheet(17/52 Pages) NXP

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TDF8599_1

Product data sheet

Rev. 01 — 13 November 2008

17 of 52

NXP Semiconductors

TDF8599

Class-D power ampliﬁer with load diagnostics

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 set, diagnostic information is also given. Any detected offset shuts down both

channels when bit IB2[D7] is not set. To restart the TDF8599 in I2C-bus mode, pin EN

must be toggled or DCP disabled by connecting pin DCP to pin GND.

In non-I2C-bus mode, when an offset is detected, DCP always gives diagnostic

information on pin DIAG and shuts down both channels. Connecting pin DCP to pin GND

disables DCP.

8.5.6 Supply voltages

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

threshold (typically 7.5 V). 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 (typically 27 V). 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 the 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.

Table 10.

Overview of TDF8599 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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