Hello there,
I have been designing a product around the LMZ14202H regulator. Basically, we have a product we want to operate in the range of 12-36VDC. All is well until we get to about 32VDC at which point when power is applied to the regulator circuit (cold boot up/zero voltage state), it fails almost immediately and becomes a direct short on my power supply feeding this test circuit; after which point the regulator is toast and will no longer function. If I replace with a new regulator, everything works fine when I keep it below 32VDC.
Using the TI suggested component values as per the spec sheet for a 12VDC output, with the change of the CSS capacitor being 0.1uf now because I thought this issue was related to a high inrush current on the load. This issue existed prior to this change also, with the suggested value of 4200pF cap. Here are the component values:
RFBT: 34K
RFBB: 2.43K
RON: 249K
COUT: 47uF
CSS: 4700pF and also tried 0.1uF
Any ideas where to look that might be causing the issue?