I have fried NDB7875 now, because of ded Mosfet on FlexMod P3
I want to do problem analysis to make sure I not going to repeat this again.
Setup:
FlexMod P3.3 with Bigger heatsink then original and Fan blowing on it
NDB7875 in copper AIXIZ module inserted in 12mm heatsink housing, fan blowing on it as well
Current 2.4A
Vin 24V
Vmod 5V (full power)
Not even 5 minute of playing with wood burning, I hear crack.... and LD is off. No smoke no smell. Driver heatsink was hot, but I could hold my hand on it for some time.
Diode was warm
In result, mosfet has crack on it!
Diode fried inside all leads to central crystal are melted (checked under microscope)
T fuse is blown.
I don't think I really pushed it (I mean driver) 2.4A for this LD (480mV on power resistor of FlexMod) is normal according to dtr-lpf
Everything was soldered, nothing shorted.
Diode reads infinity right now.
Potential cause: Mosfet overheat and short inside, sending some massive voltage to LD? My PSU is 24V 20A so it can fry stuff....
I dont have another ideas. May you be guys have ideas/suggestions?
PS. Where can I see schematic of FlexMod P3.3?
I want to do problem analysis to make sure I not going to repeat this again.
Setup:
FlexMod P3.3 with Bigger heatsink then original and Fan blowing on it
NDB7875 in copper AIXIZ module inserted in 12mm heatsink housing, fan blowing on it as well
Current 2.4A
Vin 24V
Vmod 5V (full power)
Not even 5 minute of playing with wood burning, I hear crack.... and LD is off. No smoke no smell. Driver heatsink was hot, but I could hold my hand on it for some time.
Diode was warm
In result, mosfet has crack on it!
Diode fried inside all leads to central crystal are melted (checked under microscope)
T fuse is blown.
I don't think I really pushed it (I mean driver) 2.4A for this LD (480mV on power resistor of FlexMod) is normal according to dtr-lpf
Everything was soldered, nothing shorted.
Diode reads infinity right now.
Potential cause: Mosfet overheat and short inside, sending some massive voltage to LD? My PSU is 24V 20A so it can fry stuff....
I dont have another ideas. May you be guys have ideas/suggestions?
PS. Where can I see schematic of FlexMod P3.3?