Given the power supply shipped with my netburner (7.5v @ 1.2A), how much power and current is available for extension hardware? I think the MOD5270 takes 3.3v and (?) 300 mA. Don't know about the rest, and can't find it documented.
Thanks.
How much extra power on MOD-70-DEV with MOD5270
Re: How much extra power on MOD-70-DEV with MOD5270
The power supply (walwort) provides way more power then the switching power supply can deliver. The limiting factor here is going to be the switching power supply and the related power supply components on the Dev-Board. On this board the switching power supply is rated at 1.5A, you can look at the data sheet for it here:
http://focus.ti.com/lit/ds/symlink/mc33063a.pdf
I would estimate that 1A of 3.3V should not be an issue but we have not done any in-house endurance tests at high power consumption. I probably would not push this switcher to 1.5A for long periods of time if you want it to last. We designed this supply to safely be able to power 2-3 times a modules power consumption but did not design for large external power draws. If the switcher (U1) or the diode (D1) get too hot to touch, then you are probably drawing too much current.
The MOD-DEV-100 Dev-Board has a much higher quality switching power supply that is rated for 3A at 3.3V. We also have a stripped down development board called the MOD-DEV-50 which sports the same switching supply as the MOD-DEV-100 but is about the same size as the Dev-70.
http://focus.ti.com/lit/ds/symlink/mc33063a.pdf
I would estimate that 1A of 3.3V should not be an issue but we have not done any in-house endurance tests at high power consumption. I probably would not push this switcher to 1.5A for long periods of time if you want it to last. We designed this supply to safely be able to power 2-3 times a modules power consumption but did not design for large external power draws. If the switcher (U1) or the diode (D1) get too hot to touch, then you are probably drawing too much current.
The MOD-DEV-100 Dev-Board has a much higher quality switching power supply that is rated for 3A at 3.3V. We also have a stripped down development board called the MOD-DEV-50 which sports the same switching supply as the MOD-DEV-100 but is about the same size as the Dev-70.
Re: How much extra power on MOD-70-DEV with MOD5270
I would take a look at the part number on the switcher chip, and then the datasheet. At fully rated current most components will require a heat sink, so you need to derate it w/o one.