TDA8954 NXP Semiconductors, TDA8954 Datasheet - Page 13

• Manufacturer Part Number: TDA8954
• Description: The TDA8954 is a stereo or mono high–efficiency Class D audio power amplifier in asingle IC featuring low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8954_1
Product data sheet
8.4.3 Window Protection (WP)
8.4.4 Supply voltage protection
Window Protection (WP) checks the conditions at the output terminals of the power stage
and is activated:
If the supply voltage drops below the minimum supply voltage threshold, V
circuit will be activated and the system will shut down. Once the supply voltage rises
above V
If the supply voltage exceeds the maximum supply voltage threshold, V
circuit will be activated and the power stages will be shut down. When the supply voltage
drops below V
An additional UnBalance Protection (UBP) circuit compares the positive analog supply
voltage (on pin VDDA) with the negative analog supply voltage (on pin VSSA) and is
triggered if the voltage difference exceeds a factor of two (V
2 × V
V
Fig 9.
th(ubp)
•
•
During the start-up sequence, when the TDA8954 is switching from Standby to Mute.
Start-up will be interrupted if a short-circuit is detected between one of the output
terminals and one of the supply pins. The TDA8954 will wait until the short-circuit to
the supply lines has been removed before resuming start-up. The short circuit will not
generate large currents because the short-circuit check is carried out before the
power stages are enabled.
When the amplifier is shut down completely because the OCP circuit has detected a
short circuit to one of the supply lines.
Section
lines has been removed.
WP will be activated when the amplifier attempts to restart after 100 ms (see
DDA
, the system restarts after 100 ms.
th(uvp)
). When the supply voltage difference drops below the unbalance threshold,
Current limiting
8.4.2). The amplifier will not start-up again until the short circuit to the supply
again, the system will restart after a delay of 100 ms.
th(ovp)
V
I
DIAG2
MAX
I
again, the system will restart after a delay of 100 ms.
OUT
Rev. 01 — 24 December 2009
short to VDDP applied
current
limiting
protection
circuit
short
switch off amplifier
t
2 × 210 W class-D power amplifier
DDA
010aaa563
> 2 × |V
TDA8954
© NXP B.V. 2009. All rights reserved.
th(ovp)
SSA
th(uvp)
| OR |V
, the OVP
, the UVP
SSA
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