Yes, we test the TPS2051 every time we test a board. It is standard practice. And we have gotten very god at replacing them when the use connects 6V to them because they don't read the manual or the label on the connector..
Gerald On Fri, Jan 10, 2014 at 10:41 PM, Loren Amelang <[email protected]>wrote: > Trying to understand this... It seems you are saying the default state of >> the TPS65215C is to have the AC pin internally connected to the USB pin. >> But the datasheet says: >> ----- >> AC input is prioritized over USB input, i.e. if both inputs are valid, >> current is pulled from the AC input and not USB. If both, AC and USB >> supplies are available, the power-path switches to USB input if VAC drops >> below 4.1 V (fixed threshold). >> >> Note that the rise time of VAC and VUSB must be less than 50 ms for the >> detection circuits to operate properly. If the rise time is longer than 50 >> ms, the IC may fail to power up. >> >> The linear charger periodically applies a 10-mA current source to the BAT >> pin to check for the presence of a battery. This will cause the BAT >> terminal to float up to > 3 V which may interfere with AC removal detection >> and the ability to switch from AC to USB input. For this reason, it is not >> recommended to use both AC and USB inputs when the battery is absent. >> ----- >> >> So there is the official word on all the power supply rise-time issues >> people report! >> >> ----- >> AC and USB Input Discharge >> AC and USB inputs have 90-µA internal current sinks which are used to >> discharge the input pins to avoid false detection of an input source. The >> AC sink is enabled when USB is a valid supply and VAC is below the >> detection threshold. Likewise, the USB sink is enabled when AC is a valid >> supply and VUSB is below the detection limit. >> >> Both current sinks can be forced OFF by setting the [ACSINK, USBSINK] >> bits to 11b. Both bits are located in register 0x01 (PPATH). >> ----- >> >> There is an even more important reason for never having AC and USB >> connected simultaneously. >> >> Sure sounds to me like the TPS65215C never turns on both FETs at the same >> time. >> >> >> But as I asked before, the reality is best known from the RMA stream - do >> people actually fry their TPS2051 switches? >> >> Loren >> >> >> On Wednesday, January 8, 2014 5:33:51 AM UTC-8, Gerald wrote: >> 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 >> >> -- > 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.
