TDF8599 NXP Semiconductors, TDF8599 Datasheet - Page 17

• Manufacturer Part Number: TDF8599
• Description: I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier
• Manufacturer: NXP Semiconductors

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NXP Semiconductors
TDF8599_1
Product data sheet
8.5.6 Supply voltages
8.5.7 Overview of protection circuits and amplifier states
In I
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 I
must be toggled or DCP disabled by connecting pin DCP to pin GND.
In non-I
information on pin DIAG and shuts down both channels. Connecting pin DCP to pin GND
disables DCP.
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.
[1]
[2]
[3]
[4]
[5]
[6]
Protection circuit name
TFP
OTP
OCP
WP
DCP
UVP
OVP
2
C-bus mode, DC offsets generate a voltage shift around the bias voltage. When the
When fault is removed.
Amplifier gain depends on the junction temperature and size of the heat sink.
TFP influences restart timing depending on heat sink size.
Shorted load causes a restart of the channel every 50 ms.
Latched protection is reset by toggling the pin EN or by disabling DCP in I
In I
I
2
C-bus command.
2
C-bus mode deep supply voltage drops will cause a Power-On Reset (POR). The restart requires an
2
Table
C-bus mode, when an offset is detected, DCP always gives diagnostic
Overview of TDF8599 protection circuits and amplifier states
10.
Rev. 01 — 13 November 2008
Amplifier state
Complete
shutdown
N
Y
N
N
Y
Y
Y
Class-D power amplifier with load diagnostics
[2]
Channel
shutdown
N
N
Y
Y
N
N
N
[2]
2
C-bus mode.
2
C-bus mode, pin EN
TDF8599
© NXP B.V. 2008. All rights reserved.
Restart
Y
Y
Y
Y
N
Y
Y
[3]
[3]
[4]
[6]
[5]
[1]
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