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LTM4619EV Datasheet(PDF) 10 Page - Linear Technology |
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LTM4619EV Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LTM4619 10 4619f Mode Selections and Phase-Locked Loop The LTM4619 can be enabled to enter high efficiency Burst Mode operation, constant-frequency pulse-skipping mode, or forced continuous conduction mode. To select the forced continuous operation, tie the MODE/PLLIN pin to a DC voltage below 0.8V. To select pulse-skipping mode of operation, tie the MODE/PLLIN pin to INTVCC. To select Burst Mode operation, float the MODE/PLLIN pin. Frequency Synchronization A phase-lock loop is available on the LTM4619 to synchro- nize the internal clock to an external clock source connected on the MODE/PLLIN pin. The clock high level needs to be higher than 1.6V and the clock low level needs to be lower than 1V. The frequency programming voltage and or the programming voltage divider must be removed from the FREQ/PLLFLTR pin when synchronizing to an external clock. The FREQ/PLLFLTR pin has the required onboard PLL filter components for clock synchronization. The LTM will default to forced continuous mode while being clock synchronized. Channel 1 is synchronized to the rising edge on the external clock, and channel 2 is 180 degrees out-of-phase with the external clock. APPLICATIONS INFORMATION Frequency Selection The switching frequency of the LTM4619’s controllers can be selected using the FREQ/PLLFLTR pin. If the MODE/ PLLIN pin is not being driven by an external clock source, the FREQ/PLLFLTR pin can be set from 0V to 2.4V to pro- gram the controller’s operating frequency from 250kHz to 780kHz using a voltage divider to INTVCC (see Figure 19). The typical frequency is 780kHz. If the output is too low or the minimum on-time is reached, the frequency needs to decrease to enlarge the turn-on time. Otherwise, a significant amount of cycle skipping can occur with cor- respondingly larger current and voltage ripple. Refer to the figure of Output Voltage vs Minimum On-Time to choose a proper frequency. Figure 2. Switching Frequency vs FREQ/PLLFLTR Pin Voltage FREQ PIN VOLTAGE (V) 0 0.5 1 1.5 2 4619 F02 2.5 0 100 300 400 500 900 800 700 200 600 |
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