The TPS65215C passes what ever voltage is supplied to it out heat pin as long as it is not over 7.2V, which is mote than 5V. So, while the TPS65217C can run at 6V, the TPS2051 cannot,.
Gerald On Tue, Jan 7, 2014 at 10:37 PM, Loren Amelang <[email protected]>wrote: > 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]> 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]. >>> >>> 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. > -- 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.
