ADUM4146 Peak Current

Hi texasinstrumentsisdeadtome,

For Q1: yes the resistor needs to be adjusted to meet your 6A requirement. The 4.6A is the output drive with 2ohm external resistor. 
the supply voltage also have something to do with the output peak current due to the V/R.

For Q2: the LTSpice models for the ADuM4146 is currently in the stage of testing. Hopefully before this month ends, we have the model released. There is a small difference with 4146 vs the 413x models especially the DESAT circuit timings. For the Miller Clamp, yes, they are just the same. 

For PSA1: Thanks for this info, can you advise why we should put the RBlank in between diodes? The current Rblank location is for it to provide higher charging current to larger Cblank with the same blanking time which is beneficial in a noisy environment (Rblank is optional since we have internal 500uA bias current already. If the Rbank is in connected to the cathode of the diode, would it be in reversed biases preventing the extra charging current to charge Cblank?

Thanks and regards,

Jefferson

jeco said:

For Q2: the LTSpice models for the ADuM4146 is currently in the stage of testing. Hopefully before this month ends, we have the model released. There is a small difference with 4146 vs the 413x models especially the DESAT circuit timings. For the Miller Clamp, yes, they are just the same. 

Jefferson, Got it and thanks on Q1/Q2 i will wait for the model

jeco said:

If the Rbank is in connected to the cathode of the diode, would it be in reversed biases preventing the extra charging current to charge Cblank?

sorry im dumb. I meant to Say anode i always forget which side is which. Cathode is the side with whiskers. 

Resistor should be connected to anode because in the current position like u guys have it in the d/s during normal operation you will get a voltage divider with DESAT pin as the middle point when the power switch pulls its collector or emitter down which is undesreable and your threshold is not gonna be what you think it and its gonna trip early 100%. depending on the value it might be above desat thresh at all times lol if u put the resistor between RDESAT and anode you can control blanking time and threshold seperately, DESat equation willbe same as before, rdesat equation will be similar to the one u wrote but use sum of rlim and rdesat

jeco said:

For Q2: the LTSpice models for the ADuM4146 is currently in the stage of testing. Hopefully before this month ends, we have the model released. There is a small difference with 4146 vs the 413x models especially the DESAT circuit timings. For the Miller Clamp, yes, they are just the same. 

Jefferson, Got it and thanks on Q1/Q2 i will wait for the model

jeco said:

If the Rbank is in connected to the cathode of the diode, would it be in reversed biases preventing the extra charging current to charge Cblank?

sorry im dumb. I meant to Say anode i always forget which side is which. Cathode is the side with whiskers. 

Resistor should be connected to anode because in the current position like u guys have it in the d/s during normal operation you will get a voltage divider with DESAT pin as the middle point when the power switch pulls its collector or emitter down which is undesreable and your threshold is not gonna be what you think it and its gonna trip early 100%. depending on the value it might be above desat thresh at all times lol if u put the resistor between RDESAT and anode you can control blanking time and threshold seperately, DESat equation willbe same as before, rdesat equation will be similar to the one u wrote but use sum of rlim and rdesat

alright good talk lol