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It could be a problem of PCB Layout. Whenever you have a Switching node, please make sure that the length (or Area) of the node on PCB board is as small as possible.
Otherwise it will act as antenna, which will interfere (emission EMI) with other circuitry.
One more problem could be the loop...
Re: how to get the power switch's size (w/L) in dc-dc conver
Why do you need W/L of the power FET.
Generally they only mention RON (ON resistance) of the switch in the data sheets. I dont think you will know unless you are a designer. You can calculate W/L approximately if you know Un && Cox...
Re: selection of switching frequency in Power supply design-
--If you are using high switching frequency, it means more EMI nosie.
--But if you are using high switching frequency, your inductor value is reduced. that is an size advantage
--higher the swiching frequncy, higher the swiching...
Re: 24v,4amps dc source
I think your question is not clear.
For what application you need 24V/4A DC source.
you want to convert 110V AC to 24V DC with 4A load current capability.
Re: shutdown circuit
----check the DC current for Different supply voltages in shutdown mode. Generally by applying Active low (it can be active high) part goes into shutdown mode.
---Check the VIH and VIL levels of shutdown voltage.
---Transient response of the system (or part) with VIH...
Dividing ground plane is very important if your designing the pcb for power management applications. I dont't about your design, but if you have a switching regulator in your design, you better separate grounds for anlog and digital pins on the pcb. sometimes they have separate PGND and AGND...
Re: DOUBT ON LDO DESIGN
I think they can be different sometimes. If you have a pull down on one of your pins (for ex: EN pin on LDO), ground current can be different from quiescent current.
If you measure the current on gnd node they are same always. but if we measure quiescent current going...
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