Other Parts Discussed in Thread: CSD95480RWJ,
We have a circuit application to move energy back and forth between a 12 volt energy storage system (large battery with makeup power supply) and a battery being tested from 8 to 6 volts. In one mode the system will be charging the test article at a constant current from 6 to 8 volts and the power stage will be operated as a buck converter as it is defined in the data sheet. This would be the constant current mode and the controller will be slowly slowly increasing the duty cycle of the PWM signal until the test article reaches 8V and then the controller would reduce the PWM to continue charging the test article at 8V with a slowly decreasing current. To do this the controller will be reducing the PWM slowly until the system reached a minimum target current where the battery is considered charged. While reducing the charge current at the constant voltage mode, the PWM should slowly be lowered to a theoretical zero current point of Vout/Vin or 8/12= 66.7%
The question now is if the controller outputs a smaller PWM signal , say 65% will this power stage start to operate in boost mode taking power from the test article at 8V and boost it up to the 12V energy storage system. If this was a conventional half bridge it would, but is there something in the power stage circuitry that prevents it from operating in boost mode.
We realize that the skip pin should be high at this point to turn off diode emulation, the fundamental question is if this power stage can operate in boost mode if setup and controlled properly.