Datasheet

TPA3110D2
SLOS528D –JULY 2009–REVISED JULY 2012 www.ti.com
Table 2. PLIMIT Typical Operation
Output Voltage
Test Conditions () PLIMIT Voltage Output Power (W)
Amplitude (V
P-P
)
PVCC=24V, Vin=1Vrms, 6.97 36.1 (thermally limited) 43
RL=8Ω, Gain=26dB
PVCC=24V, Vin=1Vrms, 2.94 15 25.2
RL=8Ω, Gain=26dB
PVCC=24V, Vin=1Vrms, 2.34 10 20
RL=8Ω, Gain=26dB
PVCC=24V, Vin=1Vrms, 1.62 5 14
RL=8Ω, Gain=26dB
PVCC=24V, Vin=1Vrms, 6.97 12.1 27.7
RL=8Ω, Gain=20dB
PVCC=24V, Vin=1Vrms, 3.00 10 23
RL=8Ω, Gain=20dB
PVCC=24V, Vin=1Vrms, 1.86 5 14.8
RL=8Ω, Gain=20dB
PVCC=12V, Vin=1Vrms, 6.97 10.55 23.5
RL=8Ω, Gain=20dB
PVCC=12V, Vin=1Vrms, 1.76 5 15
RL=8Ω, Gain=20dB
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
TPA3110D2 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
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