7.4.1 Pulse Width Modulation (PWM) Operation

The TPSM82480 is based on a predictive OFF-time peak current control topology, operating with PWM in continuous conduction mode for current loads larger than half the ripple current. The switching frequency is typically 2.2MHz. Both the master and follower phase regulate to the same VOUT level, each with a separate current loop, using the same peak current set point, cycle by cycle. This provides excellent peak current balancing, independent of inductor dc resistance matching. Since the follower phase operates with an adaptive delay to the master phase, phase shifted operation is always obtained. If the load current decreases, the device runs with the master phase only (see Phase Add/Shed and Current Balancing).

PWM only mode can be forced by pulling MODE pin High. If MODE is set Low, the device features an automatic transition into Power Save Mode, entered at light loads, running in discontinuous conduction mode (DCM).