Part Number: TPA3139D2
Tool/software:
I have designed this for BD mode and its working now I want to convert the design to 1SPW mode .After configuring the speaker is not working so I need some review and confirmation on the calculation i have made
which one is positive and which one is negative in this mode ?
is the connection for SPW mode is correct ?
The supply used is 5V and the speaker spec is as mentioned below
Based on the PLIMIT calculation
The "virtual" rail is approximately 5.7 times (with BD mode) and 11.4 times (with 1SPW mode) the voltage at the PLIMIT pin.
RL 4 Ohm RS 0.3ohm
-
RL=4Ω (speaker)
-
RS=0.3Ω (MOSFET + filter resistance)
-
Desired unclipped output power:
- POUT(unclipped)=2/1.25W=1.6W
- SPW mode, where:VP=11.4×VPLIMIT
- POUT=(0.8696⋅VP)2/8
- (0.8696⋅VP)2=12.8
- VP=4.113V
- VP=11.4⋅VPLIMIT
- VP = 0.3608V
- VPLIMIT=(R12/(R2+R2))*vcc
- R2=0.0722(R1+R2)
- R2=0.0778⋅R1
- R2=0.0778⋅100kΩ=7.78kΩ
after setting this value not seeing any output from Amp its is always in ideal mode ..
