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DEMO MANUAL DC2984A
QUICK START PROCEDURE
Follow the procedure below to familiarize yourself with
the DC2984A.
1. Refer to Figure 2, configure the jumpers on the demo
board as follows:
JP1 = VIN
JP2 = VIN
JP3 = VIN
JP4-JP10 = DFT
JP11 = ON
JP12 = ON
2. Set PS1 to 5V, with 5A current limit. Turn on PS1. All
the regulators should come up in a default sequence:
B2 & B3 -> L2 -> B1 & B4 -> L1 & L3
3. The PGOOD LED D2 should stay off, indicating all out-
puts are in regulation. Check the output voltage of all
the regulators, they should read close to the following
values:
V
= 1.2V
VM1
V
= 1.5V
VM2
V
= 2.48V
VM3
V
= 1.81V
VM4
2
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V
= 1.2V
VM5
V
= 0.8V
VM6
V
= 1.8V
VM7
4. Set each electronic load to its corresponding current
level indicated in Figure 2. Turn on each load. The
PGOOD LED D2 should stay off, indicating all the out-
puts are still in regulation under loads. Note that if there
are not enough electronic loads for all the regulators,
this test can be done sequentially.
5. Optional: The default input of the three LDOs are from
VIN. To increase the efficiency, the LDOs can be pow-
ered from BUCK3 by configuring JP1-JP3 to V(B3).
They can also be powered from external source by
configuring these jumpers to EXT and connecting an
external supply to the corresponding VIN_LDOX.
6. Optional: The power up sequence can be programmed
by configuring JP4-JP10 to PGM/OFF . Referring to
Power Up Sequence Programming Section shown
in Figure 2, connect the SEQ_START (TP21) to the
enable test point of the first regulators to power
up. Then connect the subsequent regulators enable
test points (TP5-TP11) to the corresponding VX_
SEQ (TP14-TP20) according to the desired startup
sequence. If the enable test point of a regulator is not
connected and the jumper is at PGM/OFF position, this
regulator is turned off.
Rev. 0
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