Analog Devices Linear DC2331A-A, Demo Manual

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DEMO MANUAL
DC2331A-A/DC2331A-B
Rev. 0
QUICK START PROCEDURE
5. Set the phase selection jumpers as shown below:
JP3 GND
JP2 VCC
JP1 VCC
6. Connect the input power supply with power off, load
and meters as shown in Figure 1, Proper Equipment
Setup for DC2331A-A. See the next section, Power Con-
nections Between Assemblies and Optional Heatsinks,
for tips on how to connect input and output power.
7. After all connections are made, turn on the input
power and verify that the input voltage is between
14V and 56V.
8. Remove the clip-on lead that connects the SHDN
terminal to GND. Verify that the output voltage is 12V.
See the note after step 17 below.
Follow Steps 9–17 to Use DC2331A-A and DC2331A-B
with the Multi-Chip (Master-Slave) Feature:
9. Use a single DC2331A-A assembly and one or more
DC2331A-B assemblies:
• DC2331A-A has one power section for the LT3763
primary controller and an additional four power
sections for its LT8550 which is configured as a
master.
• DC2331A-B does not have a primary controller, and
its LT8550 is configured as a slave with four power
sections.
NOTE: It is easiest to do steps 10–13 before the
SHDN terminals, ribbon cable and power wiring are
connected:
10. Set the MODE jumpers JP4:
• On the master assembly DC2331A-A, set JP4 to
FLOAT if phase shedding is desired or to GND if
phase shedding is not desired.
• On the slave assemblies DC2331A-B, set JP4 to
FLOAT.
11. Set the SYNC jumpers JP5:
• On the master assembly DC2331A-A, set JP5
to GND.
• On the slave assemblies DC2331A-B, set JP5
to SYNC_U1.
12. Set the phase selection jumpers for the master
DC2331A-A as shown below, depending on the number
of slave DC2331A-Bs:
DC2331A-A +
DC2331A-B
(One Slave)
DC2331A-A + DC2331A-B and DC2331A-B
(Two Slaves)
DC2331A-A DC2331A-A
JP3 GND JP3 VCC
JP2 FLOAT JP2 VCC
JP1 FLOAT JP1 GND
13. Set the phase selection jumpers for the slave
DC2331A-B(s) as shown below, depending on the
number of slave DC2331A-Bs:
DC2331A-A +
DC2331A-B
(One Slave)
DC2331A-A + DC2331A-B and DC2331A-B
(Two Slaves)
DC2331A-B First DC2331A-B Second DC2331A-B
JP3 GND JP3 GND JP3 GND
JP2 VCC JP2 VCC JP2 FLOAT
JP1 VCC JP1 VCC JP1 FLOAT
14. Prepare to use the SHDN terminal to control the startup:
• Connect all the SHDN terminals together using
clip-on leads and then GND any of the SHDN ter-
minals with an additional clip-on lead.
15. In accordance with Figure 2, Proper Equipment Setup
for DC2331A-A and DC2331A-B:
• Connect the ribbon cable provided with DC2331A-B
to interface the control logic between the mas-
ter DC2331A-A and a single or multiple slave
DC2331A-B(s). Each DC2331A-A/-B has two iden-
tical ribbon cable headers, so daisy-chain ribbon
cables are not required, even for systems with
multiple slave assemblies.