TDF8599 NXP Semiconductors, TDF8599 Datasheet - Page 16

• 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
8.5.4 Window protection
8.5.5 DC Protection
Window Protection (WP) checks the PWM output voltage before switching from Standby
mode to Mute mode (outputs switching) and is activated as follows:
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 (C
Fig 15. DC offset protection and diagnostic output
•
•
During the start-up sequence:
– When the TDF8599 is switched from standby to mute (t
During operation:
– A short to one of the supply lines activates OCP causing the amplifier channel to
circuit on one of the output terminals (i.e. between V
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.
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.
IB1[D6]
V to I
Rev. 01 — 13 November 2008
IB2[D6]
DB1[D7]
S
V to I
F
Q
) to generate a cut-off frequency as shown in
IB1[D7]
IB2[D7]
S4
S3
Class-D power amplifier with load diagnostics
V
switch off channels
ref
50 k
OUT1P
OUT1N
OUT2P
OUT2N
DCP
DIAG
P
and GND) is detected, the
d(stb-mute)
001aai785
TDF8599
© NXP B.V. 2008. All rights reserved.
). When a short
C F
Figure
16 of 52
15.