TDA8932T NXP Semiconductors, TDA8932T Datasheet - Page 10

Audio Amplifiers 2X15W BTL CLASS D AMP+VOLCTRL

TDA8932T

Manufacturer Part Number
TDA8932T
Description
Audio Amplifiers 2X15W BTL CLASS D AMP+VOLCTRL
Manufacturer
NXP Semiconductors
Datasheet

Specifications of TDA8932T

Product
Class-D
Output Power
50 W
Available Set Gain
36 dB
Common Mode Rejection Ratio (min)
56 dB
Thd Plus Noise
0.015 %
Operating Supply Voltage
22 V
Maximum Power Dissipation
5000 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Audio Load Resistance
8 Ohms
Dual Supply Voltage
+/- 11 V
Input Signal Type
Differential
Minimum Operating Temperature
- 40 C
Output Signal Type
Differential, Single
Supply Type
Single or Dual
Supply Voltage (max)
36 V
Supply Voltage (min)
10 V
Output Type
1-Channel Mono or 2-Channel Stereo
Package / Case
SOIC-32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
TDA8932T/N1,112

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NXP Semiconductors
TDA8932_2
Preliminary data sheet
8.4.4 Window Protection (WP)
8.4.5 Supply voltage protection
The WP checks the PWM output voltage before switching from Sleep mode to Mute mode
(outputs switching) and is activated:
If the supply voltage drops below 10 V, the UnderVoltage Protection (UVP) circuit is
activated and the system will shut down directly. This switch-off will be silent and without
pop noise. When the supply voltage rises above the threshold level, the system is
restarted again after 100 ms.
If the supply voltage exceeds 36 V the OverVoltage Protection (OVP) circuit is activated
and the power stages will shut down. It is re-enabled as soon as the supply voltage drops
below the threshold level. The system is restarted again after 100 ms.
It should be noted that supply voltages > 40 V may damage the TDA8932. Two conditions
should be distinguished:
An additional UnBalance Protection (UBP) circuit compares the positive analog supply
voltage (V
voltage difference between them exceeds a certain level. This level depends on the sum
of both supply voltages. The unbalance threshold levels can be defined as follows:
1. If the supply voltage is pumped to higher values by the TDA8932 application itself
2. If a supply voltage > 40 V is caused by other or external causes, then the TDA8932
In case of a short to one of the supply lines, this will trigger the OCP and the amplifier
will be shut down. During restart the window protection will be activated. As a result
the amplifier will not start until 100 ms after the short to the supply lines is removed.
In case of impedance drop (e.g. due to dynamic behavior of the loudspeaker) the
same protection will be activated. The maximum output current is again limited to 4 A,
but the amplifier will not switch off completely (thus preventing audio holes from
occurring). The result will be a clipping output signal without any artifacts.
During the start-up sequence, when pin POWERUP is switched from Sleep mode to
Mute mode. In the event of a short-circuit at one of the output terminals to V
V
open-circuit outputs. Because the check is done before enabling the power stages, no
large currents will flow in the event of a short-circuit.
When the amplifier is completely shut down due to activation of the OCP because a
short-circuit to one of the supply lines is made, then during restart (after 100 ms) the
window protection will be activated. As a result the amplifier will not start until the
short-circuit to the supply lines is removed.
(see also
supply voltage will decrease and the TDA8932 is protected against any overstress.
will shut down, but the device can still be damaged since the supply voltage will
remain > 40 V in this case. The OVP protection is not a supply voltage clamp.
LOW-level threshold: V
HIGH-level threshold: V
SSP1
, V
DDA
DDP2
) and the negative analog supply voltage (V
Section
or V
Rev. 02 — 12 December 2006
SSP2
14.3), the OVP is triggered and the TDA8932 is shut down. The
the start-up procedure is interrupted and the TDA8932 waits for
P(th)(ubp)l
P(th)(ubp)h
<
>
8
8
5
3
V
V
HVPREF
HVPREF
SSA
) and is triggered if the
Class-D audio amplifier
TDA8932
© NXP B.V. 2006. All rights reserved.
DDP1
10 of 45
,

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