I see the TPS2051 in the USB Host section of the schematic, but it is fed from SYS_5V. Isn't that _after_ the TPS65217C shuts everything off when the input voltage exceeds an average of 6V?
I guess if you're being absolutely proper, the 2051 says 6.0V absolute max and the 65217 says it limits to a max of 6.4V even though 6.0V is typical. But the 2051 says output voltage range is -0.3 V to V(IN) + 0.3 V, so the internal transistor must be able to handle at least 6.3V... And I'd be amazed if they couldn't handle far more unless they are trying to feed a current overload - from which they should protect themselves. Seems like since these are both TI products, they'd be designed to work together? So my real question - do you actually see these frying in the real world? On Thursday, December 5, 2013 6:38:01 PM UTC-8, Gerald wrote: > > And if you go to 6V, it will blow up the power control switch for the USB > host, rated at 5.5VDC maximum. > > Gerald > > > > On Thu, Dec 5, 2013 at 8:27 PM, <[email protected] <javascript:>> wrote: > >> Just dug into this... My notes: >> >> BBB Power: >> No onboard input voltage regulation! Input jack connects directly to >> TPS65217C PM IC. >> >> From tps65217c.pdf: >> ----- >> Absolute Maximum Supply voltage range, >> USB, AC: -0.3 to 20 V >> RECOMMENDED OPERATING CONDITIONS - Supply voltage, USB, AC: 4.3 to 5.8 V >> Maximum Input >> current from AC: 2.5 A >> VIN(OVP) Input over voltage detection threshold >> USB, AC: 5.8 (typ)6 (max)6.4 V >> provides a linear battery charger for single-cell Li-ion and Li-Polymer >> batteries... >> ----- >> >> The 5V rails VDD_5V and SYS_5V go to the LEDs, the expansion connector, >> the DVI/HDMI connector, and the USB connectors. Unless you are using these >> for something which needs regulated +5V, the wider 4.3 to 5.8 V limits will >> keep the board itself happy. >> >> It will safely disconnect from an input that exceeds about 6V, and can >> then handle up to 20V. But it is _not_ protected from reverse polarity! >> >> >> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
