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I feel that it is PCB line interference. Please eliminate the issues of whether the ground wire of the control part, the ground wire of the power part, the current sampling point, the voltage sampling point, and the signal line pass by the strong interference source.
The comp pin also has a capacitance to the ground, so the voltage here will be Sawtooth wave wave rather than PWM. Personally, I think a triode with large magnification will be connected in series on the optocoupler, and PWM dimming by the triode may be more in line with your requirements.
The inside of the COMP pin is a constant current source, and the voltage of this pin is controlled by the optocoupler. If it is a constant current source, the voltage will also be clamped by the optocoupler. If it is a constant voltage source, will it damage the optocoupler?
If you haven't misunderstood it, you need a metal clamp for fixing the framework when winding the transformer. If so, we suggest you find a metal processing factory to customize and use aluminum ingot cutting for processing.
This is a deformation of a non isolated power supply, and BUCK is prone to problems when producing output voltages above 15V (I am not sure if it may be a driver level issue), so chip manufacturers usually recommend this approach. Alternatively, a single winding inductor can be used to output at...
Perhaps there are differences in people's understanding of the heat sink. I just feel that the focus is on how to control the heat source to not emit too much heat. If the heat source does not generate much heat, it means high efficiency, and there is no need for a large radiator. And some...
The pins of the British BS standard do not look like this. They are two square contacts with plastic sheaths and must have a protective ground wire contact, which means they must have three pins. The protective ground wire contact foot of a low-power power supply can be made of plastic.
If the effective value of the input AC voltage is Urms, then its peak value is 1.414 * Urms;
Therefore, the output voltage of a unidirectional half wave rectification circuit with capacitive filtering is Uo=1.414 * Urms;
In this way, when the input voltage is the maximum value of negative half...
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