The appropriate switching frequency for your LED
Which switching frequency we should choose?
The led switching frequency bears directly on led. As such, requirements must be considered from this two-fold vantage point,
- Viewed from the noise point，Keep your lowest switching frequency as far from these 20K as possible.
switching frequency of low-intensity noise can be resolved .when the lowest switching frequency has been below 25-30K.
- From a EMI perspective, The highest switching frequency should not be setup to the 150K .the point are stand at the threshold of EMI drop
A high quality of DC regulator can be obtained by adjusting the switching frequency in a modest variety.
Dimmer technology
We can through PWM dimmer technology, to adjust the led ‘light and shade degree. compared with analog electronic light-controlled technology, it has many virtues, such as strong robustness and convenient storage of signals. this article presents a brief discussion about the related technologies of Dimming LED.
The PWM Frequency must be more than 100HZ . this value should be greater or equal to 100 Hz can be easily accepted by human eyes. in here Have a purpose and success criteria for this PWM technology .The light bright of LED is proportional to the duty cycle of pulse .the current of PWM can not be adjusted too low. otherwise, the led color will lead to discolour .