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17:21
<
whitequark >
hi folks
17:21
<
whitequark >
can someone help us (me and my coworker)? wpwrak, DocScrutinizer05?
17:23
<
whitequark >
so we have this board with a boost converter...
http://imgur.com/ytojaUl . The only things ever soldered are IC1, C1, L1, C2, R1, R2
17:23
<
whitequark >
(and the battery)
17:24
<
whitequark >
for about half a hour the whole contraption eats 1mA and dutifully outputs 3V3
17:25
<
whitequark >
after that it starts to draw about 7A of current and explodes
17:25
<
whitequark >
the schematics, component values and layout are copied from the datasheet verbatim
17:26
<
whitequark >
the L1 has lower current rating, but is otherwise the same as the recommended component.
17:26
<
whitequark >
why the hell does it explode?!
17:32
<
larsc >
have you messured the temperature
17:32
<
wpwrak >
those russian terrorists again ...
17:33
<
whitequark >
larsc: well, it cannot possibly heat up while consuming 1mA@1.5V
17:33
<
whitequark >
(and it doesn't)
17:33
<
pcercuei >
some component burns, and creates a short circuit?
17:33
<
larsc >
read one 1A, sorry
17:34
<
qi-bot >
larsc meant: "read 1A, sorry"
17:35
<
whitequark >
pcercuei: nope, just the IC itself
17:35
<
whitequark >
and it's not like it can burn: again, 1mA idle
17:37
<
larsc >
so the datasheet claims it has a different pinout
17:38
<
whitequark >
larsc: oh?
17:38
<
larsc >
tps61220, right?
17:39
<
larsc >
looks different, although it is kind of strange that you should still get 3.3V
17:39
<
whitequark >
larsc: not sure I follow; I just compared and it's the same
17:41
<
whitequark >
where does it differ ?
17:41
<
larsc >
ah, the pins are just not in order in the schematic
17:42
<
whitequark >
well, so the current plan is to buy a bunch of chips from a different supplier (and hopefully different batch)
17:43
<
whitequark >
and ask TI why the hell does that happen
17:43
<
larsc >
in the end they are going to be fake ICs
17:44
<
whitequark >
from farnell ?
17:45
<
larsc >
hm, maybe not
17:45
<
whitequark >
Country of origin: US
17:45
<
whitequark >
so unlikely
17:48
<
larsc >
and it is a 20 not a 21?
17:50
<
larsc >
and you checked that all the pins are connected correctly on the pcb?
17:51
<
whitequark >
(and if not, why would it explode?)
17:51
<
whitequark >
I mean, I'm trying to imagine a failure mode where it would explode, and I wouldn't know how to cause that deliberately
17:51
<
whitequark >
it has over-current and over-voltage protection
17:52
<
whitequark >
over-temperature.
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17:55
<
whitequark >
as you can see it has a diode between L and Vout
17:55
<
whitequark >
so if you just short Vout to ground, it will first shutdown and then explode
18:01
<
larsc >
I'd say it looks ok
18:06
<
wpwrak >
what exactly explodes ? L1 ? IC1 ? both ?
18:07
<
whitequark >
L1 heats up too, but not enough to explode
18:08
<
wpwrak >
it's interesting that your battery would let something like that happen
18:08
<
whitequark >
AA batteries can provide quite a bit of transient current
18:11
<
wpwrak >
maybe try connecting a resistive load to see if it does that on its own or if the explosion is preceded by a load change
18:12
<
wpwrak >
(resistive load) and remove/disconnect/halt the MCU and the display
18:12
<
whitequark >
wpwrak: oh, there's nothing except IC1 and associated passive components on the board at all
18:16
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18:56
<
viric >
wpwrak: here some people say that Spain tries to force the british use the military
18:57
<
viric >
to later they use the military against Catalonia
18:57
<
viric >
saying "the british were first"
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19:28
<
wpwrak >
if the people get restless, start a war. what a novel idea ;-)
19:34
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19:38
<
viric >
peace is only what comes after war.
19:41
<
viric >
a fleet of three british warships go to Gibraltar
19:41
<
viric >
the Spanish gov said that one spanish ship will go too
19:42
<
viric >
we will see how mad it gets
19:43
<
larsc >
viric: between wars
19:44
<
larsc >
wait... Britain declared war on Spain?
19:45
<
viric >
larsc: I wanted to make the point on "war -> peace -> degradation of peace -> war -> ..."
19:46
<
viric >
but I was only playing with words.
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19:52
<
larsc >
I wonder what they are going to do when the military gets there
19:52
<
pcercuei >
play cards?
19:52
<
viric >
spain being there, it will be ridiculous for sure
19:53
<
viric >
I wonder if it will be as epic as the Perejil reconquest
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19:55
<
larsc >
why do they even fight about a dead rock?
19:55
<
viric >
:) interesting attitude, eh?
19:57
<
viric >
larsc: I guess we don't understand high politics
19:58
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19:59
<
viric >
"In 1871, the Spanish Congress debated abandoning the peñón, since by that time it had lost its military interest, but in the end the proposal was dropped."
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20:09
<
larsc >
I guess in the end its not really about the dead rock itself. And if there are frictions between the two parties, better this than fighting over a populated area
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20:18
<
viric >
bah, barely
20:18
<
viric >
I bet the king of spain shares 'girls' with the king of morocco. They are good friends.
20:19
<
viric >
last week the king of spain went to Morocco to request indult to a big pedofile, and dozens of drugdealers
20:20
<
viric >
and the other king agreed.
20:22
<
wpwrak >
it's good to be above the law
20:27
<
viric >
there is a hit book nowadays, banned accross all country, about the royal family
20:29
<
wpwrak >
heh, didn't know you were in malaysia ;-)
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20:50
<
larsc >
well, animal farm taught us that the pigs are more equal ;)
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21:14
<
viric >
yes, that attitude.
21:25
<
viric >
hm the mayor of london got into the topic. Accuses spain of going back to Franco regime, and hopes that the fleet going to Gibraltar with 'elite troops' does not go there 'by chance'.
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