[TriEmbed] Fwd: Re: Power Supply Testing - Am I over or under thinking this?

[Pete Soper]

(oops, used the wrong "reply" and this just went to Martin the first time.


-------- Original Message --------
Subject: 	Re: [TriEmbed] Power Supply Testing - Am I over or under 
thinking this?
Date: 	Tue, 24 Jun 2014 22:26:13 -0400
From: 	Pete Soper <pete at soper.us>
To: 	Martin Brooke <martin.brooke at duke.edu>



The tests I'll be doing with one of these is measuring the temperature 
rise for a given current output using an IR thermometer. We think the 
thermal pad soldered pretty well, and Chip designed in a via connection 
of the pad to a relatively large ground plane on the bottom side. Per 
datasheet figure 5 
<http://datasheet.octopart.com/TPS63031DSKT-Texas-Instruments-datasheet-10283974.pdf> 
it appears the challenge will come with low input voltage (i.e. like 
with an almost flat lithium cell) and high current output. I don't 
expect to see .8A output sustained in this case (I expect the thermal 
protection to cut in quickly). That is, I'll be surprised if the setup 
can get by without a great deal of airflow and/or extra heat sink area 
to reach its current limit in boost mode while still a mile away from 
the spec lower limit for input voltage.

-Pete

On 06/24/2014 01:46 PM, Martin Brooke wrote:
> The data sheet Figure 12 says that at 100mA load current you will be 
> around 90% +-5% efficient for Battery 5.5V to 2.6 V  after 2.6V you 
> are on your own!  For 250mA the efficiency will be a bit  worse 
> particularly at the lower voltages.
>
> The voltage will stay at 3.3 V very precisely over that range but will 
> have a small ripple that will not change.
>
> I think it will do what you want if used correctly.
>
>
>
>
>
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