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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

8.5.4 Window protection

Window Protection (WP) checks the PWM output voltage before switching from Standby

mode to Mute mode (outputs switching) and is activated as follows:

• During the start-up sequence:

– When the TDF8599 is switched from standby to mute (td(stb-mute)). When a short

circuit on one of the output terminals (i.e. between VP and GND) is detected, the

start-up procedure is interrupted and the TDF8599 waits for open circuit outputs.

No large currents flow in the event of a short circuit to the supply lines because the

check is performed before the power stages are enabled.

• During operation:

– A short to one of the supply lines activates OCP causing the amplifier channel to

shutdown. After 50 ms the amplifier channel restarts and WP is activated.

However, the corresponding amplifier channel will not start-up until the supply line

short circuit has been removed.

8.5.5 DC Protection

DC Protection (DCP) is activated when the DC content in the demodulated output voltage

exceeds a set threshold (typically 2 V). DCP is active in both Mute mode and Operating

mode. False triggering of the DCP by low frequencies in the audio signal is prevented

using the external capacitor (CF) to generate a cut-off frequency as shown in Figure 15.

OUT1P

OUT1N

OUT2P

V to I

V to I

IB1[D6]

IB2[D6]

Vref

50 kΩ

OUT2N

DCP

DB1[D7]

SQ

IB1[D7]

DIAG

S4

IB2[D7]

switch off channels

S3

Fig 15. DC offset protection and diagnostic output

CF

001aai785

TDF8599_1

Product data sheet

Rev. 01 — 13 November 2008

© NXP B.V. 2008. All rights reserved.

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