LTM8065 how to select optional SBD and bulk cap

Question

Hi, 
 I'm DFAE in Japan. Our customer designs the power supply with LTM8025. He'd like to know how to select optional schottky diode and input bulk cap on figure below. 
 Could you please help us to select them ? 
 
 Regards, 
 Hiroyuki

tkozono · Accepted Answer

Hi Hiroyuki, 
 Sizing the input cap depends on many factors. Your AC input current will depend on your input voltage, output voltage and output current. Sizing the cap will also depend on your system requirements, including EMI and the capability of your input supply (current slew rate). You can download LTspice and LTpowerCAD to assist in calculating the input current and ESR losses. You can also contact an ADI FAE if you need more assistance. 
 The schottky diode will need to handle the power from the turn-on transient described in the datasheet. LTspice can also help demonstrate how much energy is transferred to the output during turn-on. This will depend on the capacitor sizes, capacitor ESL and voltage slew rate of your input supply. 
 As you can see, the first step is to simulate your design in LTspice. Then using that information you can design or tweak the capacitor and schottky diode parts.)

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LTM8065 how to select optional SBD and bulk cap

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