SNVSAP9A March 2017 – February 2018 LM25141-Q1
PRODUCTION DATA.
To synchronize the LM25141-Q1 to an external source, apply a logic level clock signal to the DEMB pin. The synchronization range is 350 kHz to 550 kHz when the internal oscillator is set to 440 kHz. When the internal oscillator is set to 2.2 MHz, the synchronization range is 1.8 MHz to 2.6 MHz. If there is a valid RT resistor and a synchronization signal, the LM25141-Q1 with ignore the RT resistor and synchronize the controller to the external clock. Under low VIN conditions, when the minimum off-time is reached (100 ns), the synchronization clock is ignored to allow the frequency to drop to maintain output voltage regulation.