Hi everyone,
I’m working on a high-voltage DC-DC converter project, and I’m evaluating the FFSH30120ADN-F155 fast recovery diode (Fairchild). From what I’ve gathered, it’s rated at 1200 V with a 200 µA reverse leakage current, and the listing mentions essentially no recovery time. It seems like a solid candidate for my design, but I want to make sure I’m not missing anything before I commit.
Project context
It’s a high-voltage boost converter, switching at around 50–100 kHz.
The diode would be handling flyback / freewheeling duties in the circuit.
I’m also considering thermal behavior and board layout, since space is tight.
My questions for the experts here
Do you think 200 µA leakage at 1200 V will cause meaningful efficiency loss or heating in practice? Has anyone here actually used this diode (or something similar) in SMPS or converter designs? How was the switching behavior at those frequencies? Would you recommend pairing it with an RC snubber or other damping to reduce ringing and improve performance? Would you recommend sticking with this silicon diode, or would it be smarter to invest in SiC or GaN alternatives for efficiency and thermal headroom?
I’d really appreciate any advice or real-world feedback. I’m trying to balance cost, efficiency, and reliability for this converter, and while the FFSH30120ADN-F155 looks like a good fit, I’d like to hear from those with more hands-on experience.
Thanks in advance!
J
I’m working on a high-voltage DC-DC converter project, and I’m evaluating the FFSH30120ADN-F155 fast recovery diode (Fairchild). From what I’ve gathered, it’s rated at 1200 V with a 200 µA reverse leakage current, and the listing mentions essentially no recovery time. It seems like a solid candidate for my design, but I want to make sure I’m not missing anything before I commit.
Project context
It’s a high-voltage boost converter, switching at around 50–100 kHz.
The diode would be handling flyback / freewheeling duties in the circuit.
I’m also considering thermal behavior and board layout, since space is tight.
My questions for the experts here
Do you think 200 µA leakage at 1200 V will cause meaningful efficiency loss or heating in practice? Has anyone here actually used this diode (or something similar) in SMPS or converter designs? How was the switching behavior at those frequencies? Would you recommend pairing it with an RC snubber or other damping to reduce ringing and improve performance? Would you recommend sticking with this silicon diode, or would it be smarter to invest in SiC or GaN alternatives for efficiency and thermal headroom?
I’d really appreciate any advice or real-world feedback. I’m trying to balance cost, efficiency, and reliability for this converter, and while the FFSH30120ADN-F155 looks like a good fit, I’d like to hear from those with more hands-on experience.
Thanks in advance!
J