8.4.2 Active Mode
The TPS560430-Q1 is in Active Mode when both VEN and VIN are above their respective operating threshold. The simplest way to enable the TPS560430-Q1 is to connect the EN pin to VIN pin. This allows self-startup when the input voltage is in the operating range: 4.0 V to 36 V. Please refer to Enable section for details on setting these operating levels.
In Active Mode, depending on the load current, the TPS560430-Q1 will be in one of four modes:
- Continuous conduction mode (CCM) with fixed switching frequency when load current is above half of the peak-to-peak inductor current ripple (for both PFM and FPWM versions).
- Discontinuous conduction mode (DCM) with fixed switching frequency when load current is lower than half of the peak-to-peak inductor current ripple in CCM operation (only for PFM version).
- Pulse frequency modulation mode (PFM) when switching frequency is decreased at very light load (only for PFM version).
- Forced pulse width modulation mode (FPWM) with fixed switching frequency even at light load (only for FPWM version).