Quick Start Procedure - Analog Devices Linear LT3383 Demo Manual

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
Arrow.com. Arrow.com.
Downloaded from Downloaded from
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