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LT8705A, LTC4000 operation error

Category: Hardware
Product Number: LT8705A, LTC4000


For our project, the LT8705A#AEFE and LTC4000#EGN were chosen to output the fuel cell and battery in parallel via diodes.

The conditions we designed are:

Input: 36V, Output: 48V, 5A
Battery charging voltage: 46.2V
Battery charging current: 1.0-2.0A (variable)
Battery Cell: 11CELL

If we test as designed, lt8705a generates heat and normal voltage is not output from INTVcc and LDO33 pins.

Therefore, if the LTC4000 is removed and the current is measured by operating at 36V, 500mA is output and still heat is generated.

We do not know if the FET (Q1) is faulty, but the output voltage seems to float very low at 3.5V.

We want to solve this problem, but we can't.

We refer to the reference circuit diagram and design it according to our specifications. Please let me know if there are any problems or other problems with the schematic we designed during this process.

thank you.


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