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It looks like there were a couple of issues with the design:
First, the schottky diodes were not sufficiently derated. (60V diodes for a 54V output). I confirmed that the diodes across M2 and M4 were blown short.
Second, the spacing rules for the PCB layout was too close (they were at the...
I've updated the Vshutdown on my board to 14V minimum, set my max V to 55 and my float voltage to 54, using the same values from the modified DC2134A above. It started working, if inefficiently, when I applied 48V to the input, similarly to how the modified evaluation board behaved (The power...
I have an update:
I tried modifying the DC2134A evaluation board to match my board more closely using components that I had on-hand
I replaced RCBAT1 with 100mOhms (.5A charge current limit)
I replaced R8 with 360kOhm and R10 with 17.8kOhm (Charge voltage ~53V)
I replaced R9 with 390kOhm and...
I'm not using the Ilimit pin because my understanding was that the inductor sense resistors were supposed to handle that. Also, none of the application examples in the datasheet use it.
I'm not legally allowed to share the layout.
All,
I'm currently working on a design that's trying to use the LTC4020 battery charger, and I'm at a loss to understand what I'm doing wrong. Here's my schematic.
When I apply 48V to Vin, I get between 24V and 38V on Vout, and nothing on the battery terminal (with no battery connected) and...
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