SLUSD49A September 2017 – January 2019 UCC256303
Refer to the PDF data sheet for device specific package drawings
The output of the pick lower block goes into a pick higher block, which selects the higher of the pick lower block output and the burst mode threshold setting.
The burst mode multiplexer selects between BMT and ground. During soft start, the multiplexer selects ground. The startup process is open loop and controlled by the soft start ramp. Burst mode is not enabled during soft start phase.
After soft start, the higher of the two inputs are sent to the differential amplifier. The other output is a comparator output FBLessThanBMT. It is sent to the waveform generator state machine to control burst mode and system external shut down.