I just received this USB 5 volt charger from Banggood and popped it open to see what was inside. Not withstanding the fact it is just floating inside the case and the inductor is hanging by its leads.
The circuit appears to be pretty much as the reference design in the datasheet and the switching frequency is ~350KHz. So unless I'm mistaken in identifying the IC would it be fair to say this should not be operated from a 24 volt supply?
The diode gives a 1 volt extra margin and chip performance may tolerate more than absolute rating but not last as long. ... By an unknown amount. Quality products would use a dab of PU adhesive on the coil. What u expect for wun dallah ?
I remember when Made in Japan in the 60's meant unreliable cheap products. Now their reliability is best. Swiss are better but also most expensive.
When I was young many years ago my AM radio was made in Japan and had 6 transistors. My friend's radio had molded into its case "12 Transistors". Inside 6 of them were connected together in a circle but were not connected to the radio circuit.
The excellent hearing aids I have as a demo are Swiss (Phonak). I tried some Danish ones (Widex) but I didn't like their sound.
It's apparent to me that whoever designed this product didn't really understand the ic they were using. The MP1482 is a synchronous buck regulator, meaning that it doesn't need a freewheeling diode. And though I can't be certain without closer examination of the board, it sure looks to me that D1 is in that position.
It's apparent to me that whoever designed this product didn't really understand the ic they were using. The MP1482 is a synchronous buck regulator, meaning that it doesn't need a freewheeling diode. And though I can't be certain without closer examination of the board, it sure looks to me that D1 is in that position.
It's apparent to me that whoever designed this product didn't really understand the ic they were using. The MP1482 is a synchronous buck regulator, meaning that it doesn't need a freewheeling diode. And though I can't be certain without closer examination of the board, it sure looks to me that D1 is in that position.