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Hi,
We are considering the circuit configuration shown in the attached image.
Could you please check if there are any problems with the constants of the peripheral components, FETs and inductors?
Q1:CSD19502Q5B, Q2:CSD19502Q5B, Q3:CSD17303Q5, Q4:CSD17303Q5, L:SRP1580CA-2R0M
capacitor constants:ex.)153p -> 15x10^3pF -> 15nF
resistance constants:ex.) 93.1KF -> 93.1kOhm(1%)
<Conditions>
LM34936RHFR
Vin=4.5V to 24V, Vout=12V, Iout=10A(max)
Best Regards,
Nishie
Hi Nishie,
Please use LM5176 Design Calculator (Rev. A) for a first check as these 2 devices are using the same regulation scheme.
Best regards,
Feng Ji
Hi Feng-san,
I will check with the documents you gave me.
I just want you to comment on whether there is any problem in selecting FET.
Should I check with the FET team instead of you?
Best Regards,
Nishie
Hi Nishie,
I would think Q3:CSD17303Q5, Q4:CSD17303Q5 are good choice.
Please reconsider Q1:CSD19502Q5B, Q2:CSD19502Q5B because:
1. Min Vin=5V means the gate driver voltage may be 4.5V, CSD19502Q5B will show much higher Rds(on).
2. Considering 24V max input voltage, 80V rating is a bit over designed. I think 40V or 60V will be good.
Best regards,
Feng Ji
Hi Feng-san,
Thank you for your support!
I will pass along information to my customer.
Best Regards,
Nishie
Hi Feng-san,
I received an additional question from a customer, so let me discuss it with you.
Since you said about Q1 and Q2 ”Considering 24V max input voltage, 80V rating is a bit over designed. I think 40V or 60V will be good.”.
Is there any problem if the Q1 to Q4 FETs are CSD18513Q5A?
Best Regards,
Nishie
Hi Nishie,
We can use CSD18513Q5A as a starting point.
Best Regards,
Feng Ji