Post Go back to editing

MAX16127 OVSET/UVSET rising & falling edge dependencies, Avoid gate absolute maximum limits

Thread Summary

The user inquires about the MAX16127 EVKIT's hysteresis and voltage differences, recommendations for operating above 35V, the role of the 75V Zener diode, and discrepancies in resistor selection formulas. The support engineer recommends using a 38V Zener diode at the input to protect against gate voltage exceeding 45V, explains that the 330uF capacitor (C4/C10) filters high-frequency noise and stabilizes output voltage, and suggests the MAX16128/29 for higher voltage operation with a Zener diode clamp. The -60V to +90V full-featured solution is for transient protection, not extended normal operation.
AI Generated Content
Category: Hardware
Product Number: MAX16127

1. In MAX16127 EVKIT, there's 0.6V & 1.4V difference in rising & falling edge w.r.t UVSET & OVSET respectively. What are the parameters influencing this variation? Hysterisis of 0.05*1,225V & schottky diode of 0.3V?

2. If we're planning to use the MAX16127 over 35V(Our req: max.38V) then what are you recommendation? I have below implementation in mind, let me know an optimal solution:

           a. if we provide low tolerance 38V zener diode at the input so that we can avoid gate voltage exceeding 45V or

           b. provide low tolerance 45V zener diode at the gate pin w.r.t ground? 

3. What does -60V to +90V full featured solution? Only transients support? Also, it'd be helpful if you could explain the importance of 75V zener diode at D1 in evaluation schematics. 

4. What are the consequences if we use OVSET resistors connect to TERM pin(Just like MAX16126) instead of recommendation for MAX16127? Will it fail to operate in voltage limiter mode?

5. Do you have any new solution which is operable above 35V in normal operation?