Optional logic input that enables diode emulation when in the low state. In diode emulation mode, the low-side NMOS is latched off for the remainder of the PWM cycle after detecting reverse current flow (current flow from output to ground through the low- I side NMOS). When DEMB is high, diode emulation is disabled allowing current to flow in either direction through the low-side NMOS. A 50-kΩ pull-down resistor internal to the LM5117 holds DEMB pin low and enables diode emulation if the pin is left floating.
