led-driver/led-driver.kicad_pcb, branch master 450 mA, 17 W LED Driver based around the LM3409(HV) Increase UVLO turn-on to 43 V 2020-01-01T22:59:13+00:00 David Phillips david@sighup.nz 2019-09-24T09:12:38+00:00 295347cb01201de0d022414480819af9b9605c32 The initial design assumed that the UVLO was a feature of the LM3409 not needed by this board. It was set at the datasheet values of 10.1 V turn-on with 1.1 V of hysteresis. However, during testing, I have found that the supply will sink a maximum of around 600 mA into the load when operated into dropout. The LM3409 datasheet confirms that this is expected behaviour. Since the supply is designed for LEDs modules with a forward voltage of 37 V, this patch changes the UVLO to just over 43 volts, meaning that we do not run the LEDs above the supply's design current of 450 mA. 
The initial design assumed that the UVLO was a feature of the LM3409 not needed
by this board. It was set at the datasheet values of 10.1 V turn-on with 1.1 V
of hysteresis. However, during testing, I have found that the supply will sink
a maximum of around 600 mA into the load when operated into dropout. The LM3409
datasheet confirms that this is expected behaviour. Since the supply is
designed for LEDs modules with a forward voltage of 37 V, this patch changes
the UVLO to just over 43 volts, meaning that we do not run the LEDs above the
supply's design current of 450 mA.
Reduce clearances, margin on MSOP footprint 2019-05-31T10:09:32+00:00 David Phillips david@sighup.nz 2019-05-31T09:58:10+00:00 a73063c4da5b3d818251334c249e4941e762a0e9 Reduction of the soldermask margin allows soldermask to be placed between the landing pads for the leads, which should aid soldering. Reduction of the pad clearance should stop DRC from complaining about nets too close together. 
Reduction of the soldermask margin allows soldermask to be placed between the
landing pads for the leads, which should aid soldering. Reduction of the
pad clearance should stop DRC from complaining about nets too close together.
Rescue symbols, minor revisions to PCB 2019-05-31T10:08:43+00:00 David Phillips david@sighup.nz 2019-05-31T09:54:26+00:00 acbfbe0cd8654f316550b56d2d7954805f34698a This commits previous work that took place sporadically between the last commit a year and a half ago, and now. 
This commits previous work that took place sporadically between the last
commit a year and a half ago, and now.
Add PCB prototype, schematic, gitignore 2017-09-10T05:35:10+00:00 David Phillips david@sighup.nz 2017-09-07T08:03:44+00:00 6a0376d6806df09b3b6002908a675c35fddae689