求翻译：SN3506A可对FB引脚输入PWM信号调节LED亮度（见图7）。滤波的PWM信号可作为DC电压对LED电流进行调节。PWM信号的频率影响输出电压纹波，推荐2.8V的PWM信号频率高于2kHz。固定PWM信号的频率并改变信号占空比即可调节LED亮度。是什么意思？

sn3506a fb pin input pwm signal to adjust the led brightness (see Figure 7). The pwm signal of the filter can be used as a dc voltage led current regulation. pwm signal frequency of the output voltage ripple, recommended the 2.8v frequency of the pwm signal is higher than 2khz. Fixed pwm frequency o

May 3506 SN A FB pin input signal conditioning PWM LED brightness (see figure 7 ). Filtering of signals can be as DC PWM LED voltage to current regulation. Impact PWM signal frequency output voltage wave tattoo, recommended the PWM V 2.8 higher than 2 kHz signal frequency. Fixed PWM signals and chan

SN3506A may input the PWM signal to the FB pin to adjust the LED brightness (to see Figure 7).The filter PWM signal may carry on the adjustment as the DC voltage to the LED electric current.The PWM signal frequency influence output voltage ripple, recommends 2.8V the PWM signaling frequency to be hi

SN3506A the FB pin input PWM signal control LED brightness (see Figure 7). The PWM signal can be used as filter DC voltage to control the LED current. Frequency output voltage ripple of the PWM signal, PWM signal frequency higher than the 2kHz of the recommended 2.8V. Fixed frequency and changes the