my class d design:
(1) triangle wave 300kHz (PWM)
(2)15V Vcc to the FULL H-bridge
(3)the output filter is butterworth 2nd order with bridge tied load configuration(BTL)
It is very strange.
When the freq of sin wave below 10kHz is applied as audio input , the output peak-peak sin wave is about 1V to 15v.
When the freq of sin wave increases from 10kHz, the output peak-peak voltage starts to increase.
As the input sin wave with freq 20Khz, the output peak-peak voltage becomes larger than 30V(about -10V to 30V).
I know that using BTL configuration, the output voltage will double.
However, in my design, why input signal below 10kHz cannot have double output voltage?
Why the output signal becomes larger as its freq starts to increase from10kHz?
Maybe I have wrong concept. Please help me. Thanks.
...very urgent...
thanks
(1) triangle wave 300kHz (PWM)
(2)15V Vcc to the FULL H-bridge
(3)the output filter is butterworth 2nd order with bridge tied load configuration(BTL)
It is very strange.
When the freq of sin wave below 10kHz is applied as audio input , the output peak-peak sin wave is about 1V to 15v.
When the freq of sin wave increases from 10kHz, the output peak-peak voltage starts to increase.
As the input sin wave with freq 20Khz, the output peak-peak voltage becomes larger than 30V(about -10V to 30V).
I know that using BTL configuration, the output voltage will double.
However, in my design, why input signal below 10kHz cannot have double output voltage?
Why the output signal becomes larger as its freq starts to increase from10kHz?
Maybe I have wrong concept. Please help me. Thanks.
...very urgent...
thanks