L

P

L

S

OUT

L

2

R

x V

R + 2 x R

P

=

for unclipped power

2 x R

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TPA3110D2-Q1

Power Limit Function

Vin=1.13

Freq=1kHz RLoad=8W

VPP

PLIMIT = 1.8V Pout = 5W

PLIMIT = 3V Pout = 10W

PLIMIT = 6.96V Pout = 11.8W

Vinput

TPA3110D2-Q1

SLOS794B – SEPTEMBER 2012 – REVISED SEPTEMBER 2015

www.ti.com

7.4.3

SD Operation

The SD pin can be used to enter the shutdown mode which mutes the amplifier and causes the TPA3110D2-Q1

to enter a low-current state. This mode can also be triggered to improve power-off pop performance.

7.4.4 PLIMIT

The PLIMIT pin limits the output peak-to-peak voltage based on the voltage supplied to the PLIMIT pin. The peak

output voltage is limited to four times the voltage at the PLIMIT pin.

Figure 35. PLIMIT Circuit Operation

The PLIMIT circuit sets a limit on the output peak-to-peak voltage. The limiting is done by limiting the duty cycle

to fixed maximum value. This limit can be thought of as a virtual voltage rail which is lower than the supply

connected to PVCC. This virtual rail is four times the voltage at the PLIMIT pin. This output voltage can be used

to calculate the maximum output power for a given maximum input voltage and speaker impedance.

(1)

Where:

16

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