That's an excellent point. What is the limiting factor? Depending on the output characteristic. If you load it with a square wave at twice the peak current, You can get twice the average internal power dissipation due to output loading.
Thanks for commenting John. The LED's are off Ebay. Unfortunately, no data sheet. Taking into consideration the 70ma. max of the 595, I did some testing and came up with 150 ohms for the series resistors. I figured if I had an overcurrent situation, I could lower the 5V and 2.5V supplies a little. Here's a link to the LED's. There diffused and not the greatest but I figured it's a start.
n't=20
f an=20
p=20
.5=20
ide=20
or=20
=20
volt=20
te=20
=20
This is not how significant figures are interpreted. When the manufacturer = says +/-70mA for absolute VCC/GND currents, they are only stating one signi= ficant figure, the '7'. If they were specifying the limit to three digits, = they would have stated 70.0mA, which would be ridiculous. That means for pu= rposes of comparing a current against the limit, you would round it to one = significant figure, which means any result in the range 65.1mA to 75.0mA is= equal to 70mA and does not exceed the limit. A further consideration is th= e guard banding of the absolute maximum ratings. This means the factor by w= hich the test current level known to produce significant damage/failure is = scaled down to (probably) guarantee 99.9% of product survive, and it is usu= ally an integer multiple. Do you really think an IC will do just find at IC= C=3D70mA but somehow mysteriously pop at 80mA? Not going to happen. Since t= he MOS in the HC/HCT family is hard pressed to deliver even 10mA per output= with a 2.2V LED in series with a 2.5V bias, across all temperatures ( see = figures 11 & 13 here
+/-70mA for absolute VCC/GND currents, they are only stating one significant figure, the '7'.
If the limit were 65, or 75, they would have said so.
"70" sounds like two digits to me.
If they were specifying the limit to three digits, they would have stated 70.0mA, which would be ridiculous. That means for purposes of comparing a current against the limit, you would round it to one significant figure, which means any result in the range 65.1mA to
75.0mA is equal to 70mA and does not exceed the limit.So, a 10 volt max rated electrolytic cap doesn't exceed its limits at
15 volts?-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
ne.
mA to 1.12A due to 50% duty (worst case).
sgroup.
output voltage magnitude is a substantial percentage of the total you want= to deliver to the LEDs, and he's already working with fairly small current= limiting resistors.
don't
te more
ut to be about right for a 2.5V drive and the most common red/green bicolor= LEDs with Vf in the 2.0-2.2V range for If~10mA, meaning no external resist= ors are required. There will probably be more uncertainty in light output d= ue to the LEDs than the 595s making it kind of pointless to do any more tha= n that. Power dissipation-wise, the 5V square is no more efficient than the= 2.5V rail splitter, all it does is spread the waste energy to a mass of re= sistors that are otherwise unnecessary.
' nonsense.
=20
=20
I did not email a response to you. Are you sure you don't have some box che= cked about receiving follow-ups? I notice if I click respond to a post with= a gmail account, the little CC box to their address pops up. I unchecked i= t for that last response to you, so it wasn't anything I did. And the box i= s unchecked for this response. Responding to non-gmail posts does not bring= up the CC box.
didn't
an
side
volt
says +/-70mA for absolute VCC/GND currents, they are only stating one significant figure, the '7'.
You happen to be mistaken. It's not like this is a secret science, look it up.
No- that's different, there is historical custom there.
didn't
an
2.5side
or
volt
operate
says +/-70mA for absolute VCC/GND currents, they are only stating one significant figure, the '7'.
How is it "different"? 10 is really 10, but 70 is 75, by historical custom?
How much current is safe to run through a diode rated at 1 amp max?
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
checked about receiving follow-ups? I notice if I click respond to a post with a gmail account, the little CC box to their address pops up. I unchecked it for that last response to you, so it wasn't anything I did. And the box is unchecked for this response. Responding to non-gmail posts does not bring up the CC box.
I have three emails from you. To: the newsgroup and CC: to me. You are the ONLY one I get email from. Not sure what you mean by gmail post. My posts go out the frontier SMTP server. My return address is indeed gmail.
Doesn't like this post produced a direct email.
didn't
of an
up
2.5side
or
volt
operate
says +/-70mA for absolute VCC/GND currents, they are only stating one significant figure, the '7'.
We know that in the case of the ecap they mean 10. , the decimal there makes it two figures. *AND* we also know it is permissible to work with voltages which when round up to 10. , but never with voltages which round down. Are you sure the diode rating does not say 1.0A? The headlines might say 1A.
checked about receiving follow-ups? I notice if I click respond to a post = with a gmail account, the little CC box to their address pops up. I uncheck= ed it for that last response to you, so it wasn't anything I did. And the b= ox is unchecked for this response. Responding to non-gmail posts does not b= ring up the CC box.
=20
It has something to do with your FROM field being gmail, that's the address= it keeps trying to CC to. It's not my problem. The CC box is unchecked on = this post too.
didn't
of an
up
2.5side
"0" or
and
2.5 voltoperate
Any
manufacturer says +/-70mA for absolute VCC/GND currents, they are only stating one significant figure, the '7'.
up.
two figures. *AND* we also know it is permissible to work with voltages which when round up to 10. , but never with voltages which round down.
What nonsense.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
didn't
outputs of an
set up
for 2.5
other side
"0" or
and
2.5 volt aoperate
Any
manufacturer says +/-70mA for absolute VCC/GND currents, they are only stating one significant figure, the '7'.
up.
it two figures. *AND* we also know it is permissible to work with voltages which when round up to 10. , but never with voltages which round down.
Nah- you're nonsense- see
On Sat, 23 Jun 2012 20:49:31 -0400, "MFudalla" wrote:
--- OK, thanks.
Here's a better sim, which more clearly shows the use of a single 5V supply and the output of the '595 with its equivalent output resistance with about a 16 mA load on it.
Version 4 SHEET 1 2348 748 WIRE -48 -752 -144 -752 WIRE 160 -752 -48 -752 WIRE 464 -752 160 -752 WIRE 880 -752 464 -752 WIRE 1488 -752 880 -752 WIRE 1600 -752 1488 -752 WIRE 1664 -752 1600 -752 WIRE 1664 -720 1664 -752 WIRE 880 -688 880 -752 WIRE 1488 -688 1488 -752 WIRE 624 -672 560 -672 WIRE 736 -672 688 -672 WIRE 832 -672 736 -672 WIRE 1600 -672 1600 -752 WIRE 1600 -672 1536 -672 WIRE -48 -624 -48 -752 WIRE 1600 -624 1536 -624 WIRE 1664 -624 1664 -656 WIRE 1664 -624 1600 -624 WIRE 160 -576 160 -752 WIRE 208 -576 160 -576 WIRE 528 -576 432 -576 WIRE 1040 -576 1024 -576 WIRE 1136 -576 1104 -576 WIRE 1232 -576 1200 -576 WIRE 1312 -576 1296 -576 WIRE 1600 -576 1600 -624 WIRE 1664 -576 1664 -624 WIRE 560 -560 560 -672 WIRE 608 -560 560 -560 WIRE 736 -560 736 -672 WIRE 736 -560 688 -560 WIRE 208 -512 32 -512 WIRE 496 -512 432 -512 WIRE 880 -464 880 -592 WIRE 912 -464 880 -464 WIRE 1024 -464 1024 -576 WIRE 1024 -464 992 -464 WIRE 1312 -464 1312 -576 WIRE 1376 -464 1312 -464 WIRE 1488 -464 1488 -608 WIRE 1488 -464 1456 -464 WIRE 1600 -464 1600 -512 WIRE 1664 -464 1664 -496 WIRE 1664 -464 1600 -464 WIRE 1760 -464 1664 -464 WIRE -48 -448 -48 -544 WIRE 32 -448 32 -512 WIRE 32 -448 -48 -448 WIRE 64 -448 32 -448 WIRE 160 -448 128 -448 WIRE 208 -448 160 -448 WIRE 560 -448 560 -560 WIRE 560 -448 432 -448 WIRE 1664 -432 1664 -464 WIRE -48 -416 -48 -448 WIRE 1600 -416 1600 -464 WIRE 464 -384 464 -752 WIRE 464 -384 432 -384 WIRE 560 -368 560 -448 WIRE 608 -368 560 -368 WIRE 736 -368 688 -368 WIRE 1024 -352 1024 -464 WIRE 1040 -352 1024 -352 WIRE 1136 -352 1104 -352 WIRE 1232 -352 1200 -352 WIRE 1312 -352 1312 -464 WIRE 1312 -352 1296 -352 WIRE 1488 -336 1488 -464 WIRE 880 -320 880 -464 WIRE 1600 -320 1600 -352 WIRE 1600 -320 1536 -320 WIRE 1664 -320 1664 -352 WIRE 1664 -320 1600 -320 WIRE -48 -304 -48 -336 WIRE 64 -304 -48 -304 WIRE 160 -304 160 -448 WIRE 160 -304 128 -304 WIRE 160 -288 160 -304 WIRE 496 -288 496 -512 WIRE 496 -288 160 -288 WIRE 1760 -288 1760 -464 WIRE -144 -272 -144 -752 WIRE 1600 -272 1536 -272 WIRE 1664 -272 1664 -320 WIRE 160 -256 160 -288 WIRE 560 -240 560 -368 WIRE 624 -240 560 -240 WIRE 736 -240 736 -368 WIRE 736 -240 688 -240 WIRE 832 -240 736 -240 WIRE -144 -160 -144 -192 WIRE 160 -160 160 -192 WIRE 160 -160 -144 -160 WIRE 528 -160 528 -576 WIRE 528 -160 160 -160 WIRE 880 -160 880 -224 WIRE 880 -160 528 -160 WIRE 1488 -160 1488 -256 WIRE 1488 -160 880 -160 WIRE 1600 -160 1600 -272 WIRE 1600 -160 1488 -160 WIRE 1664 -160 1664 -208 WIRE 1664 -160 1600 -160 WIRE 1760 -160 1760 -208 WIRE 1760 -160 1664 -160 WIRE -144 -64 -144 -160 WIRE 0 0 0 0 FLAG -144 -64 0 SYMBOL Misc\\NE555 320 -480 M0 SYMATTR InstName U2 SYMBOL cap 176 -256 M0 WINDOW 0 -33 32 Left 2 WINDOW 3 -39 58 Left 2 SYMATTR InstName C2 SYMATTR Value 100n SYMBOL diode 64 -432 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D3 SYMATTR Value 1N4148 SYMBOL diode 128 -320 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D4 SYMATTR Value 1N4148 SYMBOL res -32 -640 M0 SYMATTR InstName R8 SYMATTR Value 47k SYMBOL nmos 832 -320 R0 SYMATTR InstName M2 SYMATTR Value FDS6930A SYMBOL voltage -144 -288 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL res -32 -432 M0 SYMATTR InstName R1 SYMATTR Value 47k SYMBOL pmos 832 -592 M180 SYMATTR InstName M1 SYMATTR Value FDS6685 SYMBOL voltage 1760 -304 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 24 96 Invisible 2 SYMATTR Value PULSE(0 5 0 100n 100n 100ms 200ms) SYMATTR InstName V2 SYMBOL res 1008 -480 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 110 SYMBOL diode 688 -256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D5 SYMATTR Value 1N4148 SYMBOL res 704 -384 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 10k SYMBOL diode 624 -656 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D7 SYMATTR Value 1N4148 SYMBOL res 704 -576 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL diode 1040 -560 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 1136 -560 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL diode 1232 -560 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D6 SYMATTR Value 1N4148 SYMBOL diode 1104 -368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D8 SYMATTR Value 1N4148 SYMBOL diode 1200 -368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D9 SYMATTR Value 1N4148 SYMBOL diode 1296 -368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D10 SYMATTR Value 1N4148 SYMBOL sw 1488 -592 R180 WINDOW 0 32 15 Left 2 WINDOW 3 32 44 Left 2 SYMATTR InstName S1 SYMBOL sw 1488 -240 R180 WINDOW 0 32 15 Left 2 WINDOW 3 32 44 Left 2 SYMATTR InstName S2 SYMBOL diode 1616 -352 R180 WINDOW 0 49 32 Left 2 WINDOW 3 32 -1 Left 2 SYMATTR InstName D12 SYMATTR Value 1N4148 SYMBOL diode 1616 -512 R180 WINDOW 0 47 33 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D13 SYMATTR Value 1N4148 SYMBOL cap 1648 -720 R0 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL res 1648 -592 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL cap 1648 -272 R0 SYMATTR InstName C3 SYMATTR Value 100n SYMBOL res 1648 -448 R0 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL res 1472 -480 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 70 TEXT 72 -136 Right 2 !.tran .5 startup uic TEXT 440 -592 Left 2 ;1 TEXT 440 -528 Left 2 ;2 TEXT 440 -464 Left 2 ;3 TEXT 440 -408 Left 2 ;4 TEXT 184 -400 Left 2 ;5 TEXT 184 -464 Left 2 ;6 TEXT 184 -528 Left 2 ;7 TEXT 184 -592 Left 2 ;8 TEXT -128 -104 Left 2 !.model SW SW(Ron=1 Roff= 1g Vt=2.5 Vh=0)
-- JF
Just for grins:
Version 4 SHEET 1 2348 748 WIRE 32 -816 -208 -816 WIRE 368 -816 128 -816 WIRE 464 -816 432 -816 WIRE 656 -816 624 -816 WIRE 704 -816 688 -816 WIRE 880 -816 864 -816 WIRE 1392 -816 1328 -816 WIRE 1584 -816 1536 -816 WIRE -208 -784 -208 -816 WIRE 368 -784 368 -816 WIRE 432 -784 432 -816 WIRE 656 -784 656 -816 WIRE 688 -784 688 -816 WIRE 880 -784 880 -816 WIRE 1328 -784 1328 -816 WIRE 1584 -784 1584 -816 WIRE -176 -752 -272 -752 WIRE 32 -752 -176 -752 WIRE 336 -752 32 -752 WIRE 784 -752 336 -752 WIRE 1472 -752 784 -752 WIRE 1648 -752 1472 -752 WIRE 1712 -752 1648 -752 WIRE 1712 -720 1712 -752 WIRE 784 -688 784 -752 WIRE 1472 -688 1472 -752 WIRE 496 -672 432 -672 WIRE 608 -672 560 -672 WIRE 736 -672 608 -672 WIRE 1648 -672 1648 -752 WIRE 1648 -672 1520 -672 WIRE 1104 -656 1008 -656 WIRE 1296 -656 1216 -656 WIRE -176 -624 -176 -752 WIRE 1008 -624 1008 -656 WIRE 1296 -624 1296 -656 WIRE 1648 -624 1520 -624 WIRE 1712 -624 1712 -656 WIRE 1712 -624 1648 -624 WIRE 1648 -592 1648 -624 WIRE 1712 -592 1712 -624 WIRE 32 -576 32 -752 WIRE 80 -576 32 -576 WIRE 400 -576 304 -576 WIRE 1024 -576 1008 -576 WIRE 1120 -576 1088 -576 WIRE 1216 -576 1184 -576 WIRE 1296 -576 1280 -576 WIRE 432 -560 432 -672 WIRE 480 -560 432 -560 WIRE 608 -560 608 -672 WIRE 608 -560 560 -560 WIRE 80 -512 -96 -512 WIRE 368 -512 304 -512 WIRE 1648 -480 1648 -528 WIRE 1712 -480 1712 -512 WIRE 1712 -480 1648 -480 WIRE 784 -464 784 -592 WIRE 896 -464 784 -464 WIRE 1008 -464 1008 -576 WIRE 1008 -464 976 -464 WIRE 1296 -464 1296 -576 WIRE 1344 -464 1296 -464 WIRE 1472 -464 1472 -608 WIRE 1472 -464 1424 -464 WIRE 1712 -464 1712 -480 WIRE 1808 -464 1712 -464 WIRE -176 -448 -176 -544 WIRE -96 -448 -96 -512 WIRE -96 -448 -176 -448 WIRE -64 -448 -96 -448 WIRE 32 -448 0 -448 WIRE 80 -448 32 -448 WIRE 432 -448 432 -560 WIRE 432 -448 304 -448 WIRE 1712 -432 1712 -464 WIRE -176 -416 -176 -448 WIRE 1648 -416 1648 -480 WIRE 336 -384 336 -752 WIRE 336 -384 304 -384 WIRE 432 -352 432 -448 WIRE 480 -352 432 -352 WIRE 608 -352 560 -352 WIRE 1008 -352 1008 -464 WIRE 1024 -352 1008 -352 WIRE 1120 -352 1088 -352 WIRE 1216 -352 1184 -352 WIRE 1296 -352 1296 -464 WIRE 1296 -352 1280 -352 WIRE 1472 -336 1472 -464 WIRE 784 -320 784 -464 WIRE 1648 -320 1648 -352 WIRE 1648 -320 1520 -320 WIRE 1712 -320 1712 -352 WIRE 1712 -320 1648 -320 WIRE -176 -304 -176 -336 WIRE -64 -304 -176 -304 WIRE 32 -304 32 -448 WIRE 32 -304 0 -304 WIRE 32 -288 32 -304 WIRE 368 -288 368 -512 WIRE 368 -288 32 -288 WIRE 1808 -288 1808 -464 WIRE -272 -272 -272 -752 WIRE 1008 -272 1008 -304 WIRE 1088 -272 1008 -272 WIRE 1296 -272 1296 -304 WIRE 1296 -272 1216 -272 WIRE 1648 -272 1520 -272 WIRE 1712 -272 1712 -320 WIRE 32 -256 32 -288 WIRE 432 -240 432 -352 WIRE 496 -240 432 -240 WIRE 608 -240 608 -352 WIRE 608 -240 560 -240 WIRE 736 -240 608 -240 WIRE -272 -160 -272 -192 WIRE 32 -160 32 -192 WIRE 32 -160 -272 -160 WIRE 400 -160 400 -576 WIRE 400 -160 32 -160 WIRE 784 -160 784 -224 WIRE 784 -160 400 -160 WIRE 1472 -160 1472 -256 WIRE 1472 -160 784 -160 WIRE 1648 -160 1648 -272 WIRE 1648 -160 1472 -160 WIRE 1712 -160 1712 -208 WIRE 1712 -160 1648 -160 WIRE 1808 -160 1808 -208 WIRE 1808 -160 1712 -160 WIRE -272 -64 -272 -160 FLAG -272 -64 0 SYMBOL cap 48 -256 M0 WINDOW 0 -33 32 Left 2 WINDOW 3 -39 58 Left 2 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL diode -64 -432 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 0 -320 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL res -160 -640 M0 SYMATTR InstName R1 SYMATTR Value 47k SYMBOL nmos 736 -320 R0 SYMATTR InstName M2 SYMATTR Value FDS6699S SYMBOL voltage -272 -288 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL res -160 -432 M0 SYMATTR InstName R2 SYMATTR Value 47k SYMBOL pmos 736 -592 M180 SYMATTR InstName M1 SYMATTR Value FDS6575 SYMBOL voltage 1808 -304 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 24 96 Invisible 2 SYMATTR Value PULSE(0 5 0 100n 100n 100ms 200ms) SYMATTR InstName V2 SYMBOL res 992 -480 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 110 SYMBOL diode 560 -256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D4 SYMATTR Value 1N4148 SYMBOL res 576 -368 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL diode 496 -656 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D3 SYMATTR Value 1N4148 SYMBOL res 576 -576 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL diode 1024 -560 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D5 SYMATTR Value 1N4148 SYMBOL diode 1120 -560 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D6 SYMATTR Value 1N4148 SYMBOL diode 1216 -560 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D7 SYMATTR Value 1N4148 SYMBOL diode 1088 -368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D8 SYMATTR Value 1N4148 SYMBOL diode 1184 -368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D9 SYMATTR Value 1N4148 SYMBOL diode 1280 -368 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D10 SYMATTR Value 1N4148 SYMBOL sw 1472 -592 R180 WINDOW 0 32 15 Left 2 WINDOW 3 32 44 Left 2 SYMATTR InstName S1 SYMBOL sw 1472 -240 R180 WINDOW 0 32 15 Left 2 WINDOW 3 32 44 Left 2 SYMATTR InstName S2 SYMBOL diode 1664 -352 R180 WINDOW 0 49 32 Left 2 WINDOW 3 32 -1 Left 2 SYMATTR InstName D12 SYMATTR Value 1N4148 SYMBOL diode 1664 -528 R180 WINDOW 0 47 33 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D11 SYMATTR Value 1N4148 SYMBOL cap 1696 -720 R0 SYMATTR InstName C2 SYMATTR Value 1n SYMBOL res 1696 -608 R0 SYMATTR InstName R7 SYMATTR Value 1meg SYMBOL cap 1696 -272 R0 SYMATTR InstName C3 SYMATTR Value 1n SYMBOL res 1696 -448 R0 SYMATTR InstName R8 SYMATTR Value 1meg SYMBOL res 1440 -480 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 70 SYMBOL Misc\\NE555 192 -480 M0 SYMATTR InstName U1 TEXT -56 -136 Right 2 !.tran .5 startup uic TEXT 312 -592 Left 2 ;1 TEXT 312 -528 Left 2 ;2 TEXT 312 -464 Left 2 ;3 TEXT 312 -408 Left 2 ;4 TEXT 56 -400 Left 2 ;5 TEXT 56 -464 Left 2 ;6 TEXT 56 -528 Left 2 ;7 TEXT 56 -592 Left 2 ;8 TEXT -256 -104 Left 2 !.model SW SW(Ron=1 Roff= 1g Vt=2.5 Vh=0) TEXT 1112 -656 Left 2 ;RED LED TEXT 1096 -272 Left 2 ;GREEN LED TEXT 1408 -816 Left 2 ;CMOS OUT TEXT 712 -816 Left 2 ;HALF-BRIDGE TEXT 480 -816 Left 2 ;SHOOT-THRU TEXT 504 -784 Left 2 ;KILLER TEXT 48 -816 Left 2 ;PWM
-- JF
The wording of the 70 mA limit in my old TI databook is 'stress ratings only and functional operation ... is not implied'.
The chosen package (DIP or surface mount), and the size of the solder pads (for heatsinking) might make a difference. The limiting factor, as I see it, is the crabbiest critic present at your design review...
(for heatsinking)
The limitation is metal migration, AIUI. *Someone* at the design review should flag such a violation. This is a no-no.
??? LM317 ???? ?? ????? ????? ??? ???? ???? ?????? ?? Variable Voltage. ?? ???? ????? ( input, a dj, output) ??? ?????? ??? ????? ???? ? ?? 1.5 ????? ?? ????? ??? Output 1.25 ???? ??? 37 ???? ??? ????
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