According to my understanding, PB11 refers to a pin in the STM32 series of microcontrollers, which can be used as a PWM output. Pulse Width Modulation (PWM) is a method of regulating a signal by changing the pulse width of the signal to control the average value of the output level.
However, whether or not to configure the PB11 pin as a PWM output port depends on the development board and programming environment you are using. When using the STM32 series microcontrollers, you can configure the PB11 pin as a PWM output port by configuring the appropriate registers and using the associated library functions. Consult the relevant development documentation, data book, or resources to learn how to properly configure the PB11 pin as the PWM output port.
According to different models of the chip, pb11 multiplexing function is different, some models with pwm function.