Linear Technology LTC1563-2CGN, Universal Lowpass Filter DC338A-A DC338A-A Fiche De Données

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dc1978af

DEMO MANUAL DC1978A

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.

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.