JAJSIO5B July 2019 – February 2020 LMR36506-Q1
ADVANCE INFORMATION for pre-production products; subject to change without notice.
The part operates in Forced Pulse Width Modulation (FPWM) mode when the MODE/SYNC pin is pulled high (connected to VCC) or synchronized to an external clock among the MODE/SYNC pin trimmed variants or when the RT pin variants are factory pre-set with the inductor zero cross disabled. In this mode, diode emulation is turned off and the part remains in CCM over the full-load range. In FPWM operation, the frequency of operation is constant and fixed unless the minimum tON_MIN or tOFF_MIN are exceeded, which causes the part to enter DCM. In these cases, the FPWM operation is still maintained, but the switching frequency is folded back (reduced) in order to maintain proper output voltage regulation.