Datasheet

TPA3113D2
www.ti.com SLOS650E –AUGUST 2009–REVISED JULY 2012
GVDD Supply
The GVDD Supply is used to power the gates of the output full bridge transistors. It can also be used to supply
the PLIMIT voltage divider circuit. Add a 1μF capacitor to ground at this pin.
DC Detect
TPA3113D2 has circuitry which will protect the speakers from DC current which might occur due to defective
capacitors on the input or shorts on the printed circuit board at the inputs. A DC detect fault will be reported on
the FAULT pin as a low state. The DC Detect fault will also cause the amplifier to shutdown by changing the
state of the outputs to Hi-Z. To clear the DC Detect it is necessary to cycle the PVCC supply. Cycling S D will
NOT clear a DC detect fault.
A DC Detect Fault is issued when the output differential duty-cycle of either channel exceeds 14% (for example,
+57%, -43%) for more than 420 msec at the same polarity. This feature protects the speaker from large DC
currents or AC currents less than 2Hz. To avoid nuisance faults due to the DC detect circuit, hold the SD pin low
at power-up until the signals at the inputs are stable. Also, take care to match the impedance seen at the positive
and negative inputs to avoid nuisance DC detect faults.
The minimum differential input voltages required to trigger the DC detect are show in table 2. The inputs must
remain at or above the voltage listed in the table for more than 420 msec to trigger the DC detect.
Table 3. DC Detect Threshold
AV(dB) Vin (mV, differential)
20 112
26 56
32 28
36 17
PBTL Select
TPA3113D2 offers the feature of parallel BTL operation with two outputs of each channel connected directly. If
the PBTL pin (pin 14) is tied high, the positive and negative outputs of each channel (left and right) are
synchronized and in phase. To operate in this PBTL (mono) mode, apply the input signal to the RIGHT input and
place the speaker between the LEFT and RIGHT outputs. Connect the positive and negative output together for
best efficiency. For an example of the PBTL connection, see the schematic in the APPLICATION INFORMATION
section.
For normal BTL operation, connect the PBTL pin to local ground.
Short-Circuit Protection and Automatic Recovery Feature
TPA3113D2 has protection from overcurrent conditions caused by a short circuit on the output stage. The short
circuit protection fault is reported on the FAULT pin as a low state. The amplifier outputs are switched to a Hi-Z
state when the short circuit protection latch is engaged. The latch can be cleared by cycling the SD pin through
the low state.
If automatic recovery from the short circuit protection latch is desired, connect the FAULT pin directly to the SD
pin. This allows the FAULT pin function to automatically drive the SD pin low which clears the short-circuit
protection latch.
Thermal Protection
Thermal protection on the TPA3113D2 prevents damage to the device when the internal die temperature
exceeds 150°C. There is a ±15°C tolerance on this trip point from device to device. Once the die temperature
exceeds the thermal set point, the device enters into the shutdown state and the outputs are disabled. This is not
a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 15°C. The device
begins normal operation at this point with no external system interaction.
Thermal protection faults are NOT reported on the FAULT terminal.
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