Other Parts Discussed in Thread: LM2842,
Hello,
I am using four LMZ23608 in current share mode in my design in order to supply a high number of addressable LEDs. The microcontroller which generates the input signal to the LEDs is supplied independently by an LM2842 from the same 24 V power rail which is also operating as a 5 V standby supply.
When LED activity is requested the microcontroller controls the enable input of all LMZ23608 and also generates 90 degree phase shifted clocks for the modules.
From the datasheet I have read in chapter 7.3.1 "Synchronization Input":
Applying a sustained logic 1 corresponds to 0-Hz PWM frequency and will cause the module to stop switching.
What exactly does "stop switching" mean in this case? Assuming the microcontroller would fail or have a software bug that leads to enable pins and sync inputs being stuck high, will the module shut down safely or could it stop switching with the FET conducting and connect my 5 V power plane to the 24 V rail?
I am asking because in this case a software bug could lead to a catastrophic failure of my design by blowing the polymer capacitors on the 5 V rail.
Thanks in advance for any clarification.
Thomas