Linear Technology DC1978A, Руководство пользователя

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dc1978af
DEMO MANUAL DC1978A
SETUP PROCEDURE FOR MULTIBOARD ARRAYS
Figure 12. Array of Multiple DC1978A Demo Boards
Multiple DC1978As can be combined to control up to 36
independent power supplies. This demonstrates the co-
ordinated fault responses and accurate time base shared
across multiple LTC2974 chips.
Procedure:
1. Stack the boards together by plugging J1 of the second
DC1809A board into J3 of the first DC1809A board.
2. Connect the 12V V
IN
across the boards using the ba-
nana cables as shown in Figure 12 below. Preserve the
correct polarity (connect V
IN
to V
IN
and GND to GND).
3. The USB to I
2
C/SMBus/PMBus controller may be
plugged into either board. If both LTC2974s do not show
up in the GUI, click the hourglass icon to enumerate
the I
2
C bus and find the addresses of the parts. Make
sure to set different addresses for each LTC2974.
4. The addresses of the LTC2974 are set by the jumpers
JP1 and JP2 on DC1809A and the settings have to be
unique for each board in the array.
5. Since the individual control lines are connected across
the boards (CONTRL0 is a common bus across all
boards in the array, as are CONTROL1 CONTROL2
and CONTROL3), make sure that all control pins on all
DC1809A boards are set to the selected active state.
6. Relaunch LTpowerPlay. After launching, LTpowerPay
will enumerate the entire board array and build a rep-
resentative system tree and read all hardware settings
into the GUI.