I use LTC3813 to do 2kw boost converter ,but i saw low side mosfet PWM as below picture,its frequency change,this behavior is normal or abnormal?
bulk voltage=75v ,and connect to 12V DC/DC load 20A
CH1: Low side MOSFET PWM
CH2: BULK voltage
CH4: Boost choke current
And, i found data sheet advice add resistor from Ioff to Ith to fix this issue,but it can really fix this behavior?
Base on above description, can you suggest any ideal to fix this behavior?
I cannot see a typical application circuit in datasheet so I don't think there is a reference design for a 2kW power. But in theory it can be possible since the limiting factors will be the…
Hi ADI partner,
After checked that the frequency will be adjustable due to load is variable so we think it is fine for it.
BTW, does ADI can provide any suggestion for LT3813 can achieve to 1.5kW~2kW output ability ?
Customer would like ADI can recommend for above spec. for their new design.
I cannot see a typical application circuit in datasheet so I don't think there is a reference design for a 2kW power. But in theory it can be possible since the limiting factors will be the external power components inductor and switches. Please check your design using LTspice.
I don't think the varying switching is ideal. If the output voltage and input voltage are fixed, I don't expect the duty cycle to be changing. Please try to improve through the compensation components.
Please connect to a local ADI FAE.