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LM5170: not able to Control the converter output using ISETD. Current stays very low both with Battery and Resistive Load (50-150mA)

Part Number: LM5170
Other Parts Discussed in Thread: LM5171

Tool/software:

Using LM5170 as a Bidirectional Converter to Charge/Discharge a Battery 12V to 24V HV port. Cannot get the Battery Charging to work which is Buck Mode for LM5170, the battery is always discharging to the Circuit. 

Using ISETD as the primary control, the max current seen is 50-150mA. The Design Value is up to 2.5A per leg, and I am running Both the Channels.

For Engineering Validation I am trying to Control ISETD with a function Generator using 100KHz PWM with 20-50% Duty Cycle. But the current stays very low. 

With Battery Load: 20-80mA Discharge only even in Buck Mode (Charging)

With Resistor Load 24ohms : Max current seen is 170mA (75% Duty Cycle)

Please advice what I can try. Attached is the schematic