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inductor for boost converter

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LaserTazerPhaser:
Are these any good for a fixed frequency 1.4Mhz boost converter?

https://lcsc.com/product-detail/Power-Inductors_Sunltech-Tech-SLP1265S101MTT_C254897.html

https://lcsc.com/product-detail/Power-Inductors_Shun-Xiang-Nuo-Elec-SMDRS1275-221M_C163690.html

The current handling is fine however the core material might have such high losses it might melt the solder as there is nothing depicted in datasheets pertinent to their operating frequencies. There are no graphs about inductance to frequency in datasheets.

LaserTazerPhaser:
What specifically is needed to determine if the core material is capable of a particular switching frequency?

LaserTazerPhaser:

--- Quote from: blueskull on August 30, 2019, 12:00:49 am ---
--- Quote from: LaserTazerPhaser on August 29, 2019, 11:31:27 pm ---What specifically is needed to determine if the core material is capable of a particular switching frequency?

--- End quote ---

I can't tell the material from its look, but the construction (cylindrical design with a blue color sealed top) looks suspiciously close to those 52kHz LM2576/150kHz LM2596 module inductors.

Also, why on earth do you need 100uH for a 1.4MHz boost converter? DCM is not essentially bad.

--- End quote ---

Going to determine if they will increase efficiency, considering the load current is very small.

LaserTazerPhaser:

--- Quote from: blueskull on August 30, 2019, 12:20:05 am ---
--- Quote from: LaserTazerPhaser on August 30, 2019, 12:15:49 am ---Going to determine if they will increase efficiency, considering the load current is very small.

--- End quote ---

If ripple is accepted, consider a smaller inductor and use pulse skipping mode.

A CCM boost converter is never ZVS, thus parasitic capacitance of a high inductance choke can contribute quite some loss.

--- End quote ---

There are certain values which will increase efficiency, and 100uH might be around that value. These appear fine for the high frequency operation.

https://lcsc.com/product-detail/Power-Inductors_Changjiang-Microelectronics-Tech-FXC1040-101M_C191165.html

https://lcsc.com/product-detail/Power-Inductors_Shun-Xiang-Nuo-Elec-SMMS1360-101M_C149534.html

LaserTazerPhaser:

--- Quote from: blueskull on August 30, 2019, 12:32:07 am ---
--- Quote from: LaserTazerPhaser on August 30, 2019, 12:28:57 am ---Will try other values by swaping them into the board. These appear fine for the high frequency operation.

--- End quote ---

They look good. Look like second sources of Vishay IHLx.

--- End quote ---

Do boost ICs become damaged from no load other than its voltage divider going into its feedback terminal?

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