TDF8599 데이터 시트보기 (PDF) - NXP Semiconductors.

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TDF8599

I2C-bus controlled dual channel 43 W/2Ωsingle channel 85 W/1Ω class-D power amplifier with load diagnostics

NXP Semiconductors. 

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

Table 10. Overview of TDF8599 protection circuits and amplifier states

Protection circuit name

Amplifier state

Complete

shutdown

Channel

shutdown

TFP

N[2]

N[2]

OTP

Y

N

OCP

N

Y

WP

N

Y

DCP

Y

N

UVP

Y

N

OVP

Y

N

Restart[1]

Y[3]

Y[3]

Y[4]

Y

N[5]

Y[6]

Y

[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.

TDF8599_1

Product data sheet

Rev. 01 — 13 November 2008

© NXP B.V. 2008. All rights reserved.

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