Texas Instruments TPA3130D2 Evaluation Module TPA3130D2EVM TPA3130D2EVM 데이터 시트
제품 코드
TPA3130D2EVM
OUTP
OUTN
OUTP
-
OUTN
Speaker
Current
OUTP
OUTN
OUTP
-
OUTN
Speaker
Current
OUTP
OUTN
OUTP
-
OUTN
Speaker
Current
0 V
0 V
PVCC
No Output
Positive Output
Negative Output
0 A
0 A
0 V
-
PVCC
SLOS708C – APRIL 2012 – REVISED NOVEMBER 2013
TPA3116/18/30D2 MODULATION SCHEME
The TPA31xxD2 family has the option of running in either BD modulation or 1SPW modulation; this is set by the
MODSEL pin.
MODSEL pin.
MODSEL = GND: BD-modulation
This is a modulation scheme that allows operation without the classic LC reconstruction filter when the amp is
driving an inductive load with short speaker wires. Each output is switching from 0 volts to the supply voltage.
The OUTPx and OUTNx are in phase with each other with no input so that there is little or no current in the
speaker. The duty cycle of OUTPx is greater than 50% and OUTNx is less than 50% for positive output voltages.
The duty cycle of OUTPx is less than 50% and OUTNx is greater than 50% for negative output voltages. The
voltage across the load sits at 0V throughout most of the switching period, reducing the switching current, which
reduces any I
driving an inductive load with short speaker wires. Each output is switching from 0 volts to the supply voltage.
The OUTPx and OUTNx are in phase with each other with no input so that there is little or no current in the
speaker. The duty cycle of OUTPx is greater than 50% and OUTNx is less than 50% for positive output voltages.
The duty cycle of OUTPx is less than 50% and OUTNx is greater than 50% for negative output voltages. The
voltage across the load sits at 0V throughout most of the switching period, reducing the switching current, which
reduces any I
2
R losses in the load.
Figure 31. BD Mode Modulation
20
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