Audio Amplifiers 2X15W BTL CLASS D AMP+VOLCTRL

TDA8932T

Manufacturer Part NumberTDA8932T
DescriptionAudio Amplifiers 2X15W BTL CLASS D AMP+VOLCTRL
ManufacturerNXP Semiconductors
TDA8932T datasheet
 


Specifications of TDA8932T

ProductClass-DOutput Power50 W
Available Set Gain36 dBCommon Mode Rejection Ratio (min)56 dB
Thd Plus Noise0.015 %Operating Supply Voltage22 V
Maximum Power Dissipation5000 mWMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTAudio Load Resistance8 Ohms
Dual Supply Voltage+/- 11 VInput Signal TypeDifferential
Minimum Operating Temperature- 40 COutput Signal TypeDifferential, Single
Supply TypeSingle or DualSupply Voltage (max)36 V
Supply Voltage (min)10 VOutput Type1-Channel Mono or 2-Channel Stereo
Package / CaseSOIC-32Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesTDA8932T/N1,112  
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NXP Semiconductors
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.
8.4.4 Window Protection (WP)
The WP checks the PWM output voltage before switching from Sleep mode to Mute mode
(outputs switching) and is activated:
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
SSP1
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.
8.4.5 Supply voltage protection
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:
1. If the supply voltage is pumped to higher values by the TDA8932 application itself
(see also
supply voltage will decrease and the TDA8932 is protected against any overstress.
2. If a supply voltage > 40 V is caused by other or external causes, then the TDA8932
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.
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:
LOW-level threshold: V
HIGH-level threshold: V
TDA8932_2
Preliminary data sheet
, V
or V
the start-up procedure is interrupted and the TDA8932 waits for
DDP2
SSP2
Section
14.3), the OVP is triggered and the TDA8932 is shut down. The
) and the negative analog supply voltage (V
DDA
8
<
P(th)(ubp)l
5
8
>
P(th)(ubp)h
Rev. 02 — 12 December 2006
Class-D audio amplifier
) and is triggered if the
SSA
V
HVPREF
V
3
HVPREF
TDA8932
,
DDP1
© NXP B.V. 2006. All rights reserved.
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