ZHCSRU8 February 2024
PRODUCTION DATA
The resistor divider code for MSEL2 pin of the loop controller device (U1) selects the soft-start values. The resistor to AGND determines the number of devices sharing common output and the overcurrent thresholds. Use Table 6-10 and Table 6-11 to select the resistor values. In this two-phase design, the desired settings can be selected by floating the MSEL2 pin. This action selects 3ms soft-start time, the highest current limit thresholds and two-phase configuration.
In stackable configuration, follower modules use the resistor from MSEL2 to AGND to program IOUT_OC_WARN_LIMIT, IOUT_OC_FAULT_LIMIT, MFR_SPECIFIC_28 (STACK_CONFIG), and INTERLEAVE. The loop follower receive all other pin programmed values from the loop controller over the back-channel communication (BCX_CLK and BCX_DAT) as part of the power-on reset function. In this two-phase design, the desired settings can be selected by floating the MSEL2 pin of the loop follower device. This action selects the 30/39A current limit thresholds and programs the loop follower device to be the 180° out of phase from the loop controller device.