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The LMZ36002 switching frequency can also be synchronized to an external clock from 200 kHz to 1 MHz. Synchronizing to an external clock provides optimized system noise performance; see recommended operating range for the allowable operating ranges in the LMZ36002 datasheet. To implement the synchronization feature, connect a clock signal to the CLK pin with a duty cycle between 10% and 90%. The clock signal amplitude must transition lower than 0.4 V and higher than 2.0 V. The start of the switching cycle is synchronized to the rising edge of the CLK pin. Before the external clock is present the device operates in RT mode and the switching frequency is set by the RRT resistor. Select RRT to set the frequency close to the external synchronization frequency. When the external clock is present, the CLK mode overrides the RT mode. If the external clock is removed or fails at logic high or low, the LMZ36002 will switch at the frequency programmed by the RRT resistor after a time-out period. Connect the CLK pin (pin 8) to AGND if not used.

PTM Published on: 2016-02-16