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Enable Switch
By default, DJT090s are set to PMBus start up mode. To use external switch turn on/off the modules,
ensure the EVM is operating properly with PMBus control FIRST, then user can set the DJT090s to
EN pin start up mode and operate with a mechanical switch. For changing the startup mode, refer
to PMBus commands. For the toggle switch, toggle left is ON, toggle right is OFF.
SYNC
To measure SYNC signal, SMA connector is recommended to be populated at IN/OUT_SYNC. For use
external SYNC, consult local ABB FAEs for more info.
START EVM
The input voltage for the EVM is from 7V to 14.4V, and the input voltage must not exceed 15V. The in
current must be limited. Choose the current limitation properly based on the output power and input
voltage. All ABB measurement are evaluated at 12V rated input. The default output of DJT090 EVM is
set to be 1.2V. Connect ABB USB to I2C dongle to PMBus port (notice pin 1 location) with PC, then
use ABB DPI-CLI tool to start the DJT090 (PMBus turn on is required for the first time, it can be
changed to EN turn on via PMBus once the EVM is confirmed to be functional correctly). All EVM
board is pre-
configured in the factory, user doesn’t require to perform any additional configuration
before turning on the EVM. Refer to DPI-CLI User Guide for detailed PMBus commands. The standby
turn-on power along with pulse load leakage can go up to 20W. To achieve ideal transient
performance, input power and output power must feed in symmetrically. User is recommended to
use all the on-board terminals to pass power and distribute current evenly (use same length/size
cable for input/output). See following diagram for one example of connections. By default, the 8
channels are set to interleaving and have a phase shift of 45 degree from each other. Channel 0x10
is the master device (360 degree) and output the SYNC signal. Master can be set to any device. If less
than 8 units paralleling is desired, refer to channel reduction section for detailed steps.
0x10 (master)
0x12
0x14
0x16
0x1E
0x1C
0x1A
0x18
Default PMBus Address
