Rear car inductor lights with remore SMPS?

[treez]

Hello,
We have 30 rear car indicator LEDs which are running from BJT based linear regulators (three LEDs in each string, and a pass BJT in each string, running from the 12V car battery).

However, the indicator current has just been increased to 120mA, and now the SOT89 BJTs are running hot (443mW total in each SOT89 BJT). Therefore we wish to change to a SMPS LED driver solution.

Would there be any problems with us having a 12V to 60V boost converter on the remote rear lamp control PCB, and then bussing this 60V to the rear LED indicator PCB, and then having two ZXLD1366 buck LED drivers on the indicator PCB to drive the 30 LEDs?

I mean, is there a problem since its 60V that would be going on and off as the indicator relay switches to give the indication.....? That is, the 60V would be going on and off in the connector to the LED indicator PCB, and this may cause too much sparking in the connector contacts?.....obviously before it was just going on and off with 12V....but would a move to 60V cause sparking problems in the connector contacts as the indicators flash ON and OFF?

ZXLD1366 LED driver
**broken link removed**

 

[chuckey]

60 V is above the 50V ELV limit so special personnel protection insulation would be required.
Frank

 

[treez]

thanks, are you sure the safe limit is 50V?....I thought SELV was 42VDC?