LT3999 Synchronous Rectifier and higher output current

Hi there

I'm in the process of designing a power supply using the LT3999 and have a few questions:

1.) Can you recommend a synchronous rectifier  that could be used with the LT3999

2.) Is it possible to enhance the output current capability? (I need 5.5V@3A @Uin=15V)

3.) When simulating with LTSpice (15V Uin, +-12V Uout) changing the output current will change the output voltage, is this normal behavior?

Simulation file:

Thank you very much!

  • 0
    •  Analog Employees 
    on Sep 1, 2019 11:30 PM over 1 year ago
    1. In datasheet TYPICAL APPLICATION section, there are applications with different input output voltage and rectifier part #. Find their suitable application and choose the according  rectifiers.
    2. Max current limit is built-in. it’s for IC protection and no way to change it.
    3. LT3999 has no feedback loop. Changing load current will change the output current because of the forward power path impedance.