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View Full Version : Adaptor differences! (5V 1A) vs (5.5V 500mA) ?

nycBulent
27-06-2008, 09:52 AM
Question is related to voltage and amper: original touch cruise's adaptor is marked as "output: 5V 1A LPS"
I have another one that I bought for my ex HTC Kaiser; this adaptor is marked as "output: 5.5V 500mA"
Can I use the second one for touch cruise? Is there a general rule when it comes to such electracal small differences?
Thank you.
Rudegar
27-06-2008, 09:59 AM
the amps never matter they are pulled not pushed

the volts can cause issues as usb is 5volts and
not 5.5volts so by following the std a device could still
be toast if provides with 5.5volt but i doubt it though
DennisMoore
27-06-2008, 01:13 PM
No reason to doubt that.

In fact I saw some cellphones with USB-Charging capabilities, which didn't work after charging with a little more than 5 Volts.

Seems to be different from phone to phone if >5V does damage or not.
InfX
27-06-2008, 04:00 PM
I would refrain from feeding 5V device with a 5.5V power source, especially considering this 5.5V is probably going straight into to the VBus line of the USB client hardware, not just into charging circuits.

Also, saying that "the amps never matter they are pulled not pushed" is WRONG. Indeed, the device "pulls" the current from the power supply, but if it attempts to pull more than the power supply can provide, you may end up frying the power supply, and i mean, frying it literally, like in "overheating and melting it up".


BTW, sorry about such a nasty first post, but i really don't like the though of someone possibly frying a device because of a forum post.
satfly
27-06-2008, 08:05 PM
I just measured the output of my OEM charger, it was 5.24V so a bit more than the standard 5V. Would this be a problem?

I always thought that the current from USB chargers was seldom exactly 5V anyway.
jeanpaulik
27-06-2008, 09:58 PM
I just measured the output of my OEM charger, it was 5.24V so a bit more than the standard 5V. Would this be a problem?

I always thought that the current from USB chargers was seldom exactly 5V anyway.

Don't panic, you are in the good range: :)
"The specification provides for no more than 5.25 V and no less than 4.75 V (5 Vą5%) between the positive and negative bus power lines"
(http://en.wikipedia.org/wiki/USB)

And i presume that you 've made the measurement without any device connected to the power supply ?