Hello,
We've made a design for a LED driver for 2 x 10 Leds with the LM3492HC, based on the reference design in AN-2231.
Unfortunately when we connect Vin supply of 12V, we get not output voltage at all at the VCC (from the 5.5V LDO).
The EN pin is currently not connected at all. The LED load is also disconnected until the fundamental problem of the LDO will be solved...
Looking at the Block diagram in datasheet it seems that the LDO VCC output shouldn't be affected at all by any input pin?
We've spent hours and couldn't understand what's wrong.
Ofir