2.3.6 Parallel Module Synchronization Setting:
The 2-module parallel configuration uses the SYNC (pin 7) and CLKOUT (pin 29) pins for module synchronization.
The Host CLKOUT signal provides the clock reference for PWM synchronization and should be connected to the Client SYNC pin for parallel operation, as shown in the typical application circuit.
| Synchronization Mode | HOST SYCN | EXT SYNC INPUT Requirements |
|---|---|---|
| Internal | Leave Open | Not Used |
| External | Clock Input Supply to HOST SYNC pin | Input Voltage Threshold (High) ≥ 0.775 × VCC; Input Voltage Threshold (Low) ≤ 0.45 × VCC; SYNC Clock Frequency = 2 × PWM frequency; Allowed SYNC Frequency: 568 kHz to 1.5 MHz |
Note: The external SYNC clock is applied at 2 × PWM frequency so the device can derive the required timing for its two-phase interleaved switching architecture and maintain proper phase alignment. The SYNC signal frequency applied must also result in a higher switching frequency than the free running frequency