SNVSCM3 June 2024 LM5171
PRODUCTION DATA
Each LM5171 synchronizes to an external clock, and the clock signals must have appropriate phase delays among them for proper multiphase interleaving operation. The interleave angle between the two phases of each LM5171 can be programmed to 180° or 240° by the OPT pin. The SYNCIN and SYNCOUT are phase shifted by 90° with each other. Higher stage phases (More than 8) can be implemented using HOST MCU generating SYNCIN pulses for set of each 8 phase block. Table 6-2 summarizes the settings of the external clocks and the OPT pin state for multiphase configurations.
NUMBER OF PHASES | PHASE SHIFT BETWEEN EXTERNAL CLOCKS FOR MULTIPHASE INTERLEAVING | OPT LOGIC STATE(1) | CH-2 PHASE LAGGING VS CH-1 | NUMBER OF LM5171 CONTROLLERS NEEDED | NUMBER OF EXTERNAL CLOCKS NEEDED |
---|---|---|---|---|---|
2 | 180° | 1 | 180° | 1 | 1 or 0 |
3 | 120° | 0 | 240° | 2 | 2 |
4 | 90° | 1 | 180° | 2 | 2 |
6 | 60° or 120° | 1 | 180° | 3 | 3 |
8 | 45° | 1 | 180° | 4 | 2 |