I ran into issue with DPH5005 when using external battery pack Ultimate Speed UMAP 12000 A2. When DPH5005 is switched ON (output is by default disabled and unloaded), battery pack immediately shuts-off (presumably due to over-current "protection"). This is really annoying.
I ran few test on startup conditions:
- Battery pack is capable of 11-13V at 8A continuous, shut-off limit is around 9.5A.
- With 12V input, DPH5005 PSU consumes 32 mA (less than factory, because fan board is disabled with thermo switch)
- To startup, PSU need needs DC 12V with at least 180 mA current limit (tested with DC PS with CC), otherwise it does not start - it is stuck consuming maximum current limit at 3.0-3.1V.
- Inrush current measurements (with 12V 60A supply) showed peaks of 76A (capacitor charge with switch bounce), 1.6ms delay with no current, then 3.7ms period with 17-20A current. Second inrush depends on when PS was last turned on.
Due to very high peak currents, DPH5005 triggers battery pack over-current protection and cannot start-up (only after few tries) - almost unusable
![Sad :(](https://www.eevblog.com/forum/Smileys/default/sad.gif)
I can connect directly to internal battery, but that would eliminate over-discharge protection.
What can be done to slow down protection in battery pack or reduce inrush current to <9.5A? I would be fine with limited (say 100W maximum) input power.
EDIT: solution was found, see post below.