Other Parts Discussed in Thread: LM5060-Q1
Hello -
I am developing a 500 W generator and need to implement load dump / over-voltage protection. Our system electronics cannot be exposed to input of >75V, but during a load dump the rectified voltage of the alternator can reach 80-100V momentarily. We have looked at LTC4367 for example, which would allow us to implement a hysteretic, PWM voltage regulation when the voltage goes above our specified limit -- however, this chip and other similar chips from Linear Technology are only rated to regulate up to 60V, whereas we need to regulate to 70-75V. The TPS2400 from TI on the other hand would allow us to protect our electronics by shutting off the input, but this is not acceptable for our application because it would cause the system to shut down entirely.
Could anyone suggest a device from TI that can monitor an incoming voltage and regulate/pass through depending on a user-settable upper limit of 70-75V? Are there any other devices that might behave in a similar way that are built for load dump or over-voltage surge protection? I believe this would just be an IC that switches a FET on and off and relies on some external capacitance to maintain the output voltage at a certain level.
Additionally, are there any suggests for an alternate method of clipping this voltage during a load dump with out using large, high-power components? My apologies for any technical mistakes in this write-up; I come from mechanical engineering.
Respectfully,
-AA
