Timeline for Disable buck regulator output on startup and hold enable pin high for 1.5-2ms
Current License: CC BY-SA 3.0
15 events
| when toggle format | what | by | license | comment | |
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| Nov 14, 2016 at 9:43 | history | tweeted | twitter.com/StackElectronix/status/798099110339444736 | ||
| Nov 13, 2016 at 0:05 | vote | accept | iceman1979 | ||
| Nov 12, 2016 at 23:54 | history | edited | iceman1979 | CC BY-SA 3.0 |
fixed URLs
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| Nov 12, 2016 at 23:50 | history | edited | D.A.S. | CC BY-SA 3.0 |
added 21 characters in body
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| Nov 12, 2016 at 22:13 | history | edited | iceman1979 | CC BY-SA 3.0 |
added 1215 characters in body
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| Nov 12, 2016 at 13:02 | comment | added | iceman1979 | I guess I misread it then. Thanks for the tidbit about the feedback pin idea. That sounds like a good option. | |
| Nov 11, 2016 at 11:03 | comment | added | rioraxe | I took a look at the datasheet. Section 5.3 Soft-start explains the issue. During the initial DIM-high period, one possible way to trick the device not to run may be to raise the FB pin voltage. That can be accomplished by couple of summing resistors and a transistor to inject some current. That way you do not need to insert an extra device (e.g. MOSFET) into the power path. | |
| Nov 11, 2016 at 2:31 | comment | added | iceman1979 | Yes the output needs to be switched off so the laser does not come on. :) | |
| Nov 10, 2016 at 23:57 | comment | added | ThreePhaseEel | Do you need to switch the output off while this is happening as well? | |
| Nov 10, 2016 at 22:08 | comment | added | iceman1979 | Thanks, I'll google up on RC controlled one shot gates. The pulse time needed is about 1.5 to 2ms. | |
| Nov 10, 2016 at 19:28 | answer | added | D.A.S. | timeline score: 1 | |
| Nov 10, 2016 at 19:19 | comment | added | D.A.S. | Define time for " held high for a brief period" THis can easily be done in software or hardware with an RC controlled one shot gate.. without burning out Laser from excess pulse width but sufficient to start at low PWM without hysteresis. 1us? 1ms? | |
| Nov 10, 2016 at 19:15 | answer | added | studentforlife | timeline score: 0 | |
| Nov 10, 2016 at 18:49 | review | First posts | |||
| Nov 10, 2016 at 18:55 | |||||
| Nov 10, 2016 at 18:40 | history | asked | iceman1979 | CC BY-SA 3.0 |