SLVSH95 July 2024 TPS546C25
ADVANCE INFORMATION
The telemetry sub-system in the controller core supports the following measurements:
The ADC output is a single conversion of each measurement without rolling window averaging for fast refresh rate of these key system parameter. All above parameters are measured sequentially while the output current is measured more often than the others. This sequence design allows each IOUT telemetry value to be updated within 95µs, while each of the rest of telemetry value to be updated within 190µs.
The output voltage sense telemetry senses the differential voltage across VOSNS to GOSNS pin. The minimum READ_VOUT value is clamped at 0V. When the internal voltage divider is selected, the READ_VOUT value is scaled based on the VOUT_SCALE_LOOP value selected when setting the output voltage.
When the external voltage divider is selected, the VOUT at the ADC input is internally scaled by the VOUT_SCALE_MONITOR value selected, and the VOUT_SCALE_LOOP is always set to 1. The user can maximize the dynamic range of the sensed signal based the expected VOUT setting as described in the table in VOUT_SCALE_MONITOR. If the VOUT_SCALE_MONITOR value is chosen such that the maximum allowed VO
The output current sense telemetry senses the average of low-side FET current from the start to the end of each low-side FET on time which provides the average inductor current. To achieve high accuracy and wide report range, the device automatically sets the current sense gain. The value for READ_IOUT is
Where
The die temperature sense telemetry senses the controller die temperature. The power stage (PS) die implements overtemperature protection and the PS die temperature is not reported through telemetry sub-system. READ_TEMP1 is the PMBus READ_TEMP1 register value in decimal.