Quick Start Procedure - Linear DC2048A Demo Manual

DEMO MANUAL DC2048A

Quick start proceDure

Using short twisted pair leads for any power connections,
with all loads and power supplies off, refer to Figure 3 for
the proper measurement and equipment setup.
Follow the procedure below:
1. Before connecting PS1 to the DC2048A, PS1 must have
its current limit set to 300mA and PS2 must have its
current limit set to 500mA. For most power supplies
with a current limit adjustment feature the procedure
to set the current limit is as follows. Turn the voltage
and current adjustment to minimum. Short the output
terminals and turn the voltage adjustment to maximum.
Adjust the current limit to 300mA for PS1 and 500mA
for PS2. Turn the voltage adjustment to minimum and
remove the short between the output terminals. The
power supply is now current limited to 300mA and
500mA respectively.
Verify that there is not a battery installed in the BH1
battery holder.
2. Initial Jumper, PS and LOAD settings:
JP1 = 0 JP2 = 0 JP3 = 0 JP4 = 0
JP5 = 0 JP6 = 0 JP7 = 0
JP8 = 0 JP9 = 0 JP10 = 0
JP11 = OFF
PS1 = OFF PS2 = OFF
LOAD1 = OFF LOAD2 = OFF
3. Connect PS1 to the V
and slowly increase voltage to 2.0V while monitoring
the input current. If the current remains less than 5mA,
increase PS1 to 5.0V.
4. Set LOAD1 to 50mA. Verify voltage on V
the V 1.8V range in Table 1. Verify that the output
OUT
ripple voltage is between 20mV and 60mV. Verify that
PGVOUT is high. Decrease LOAD1 to 5mA.Verify that
PGVOUT is high. Decrease PS1 to 0V.
5. Set JP1, JP2, JP3, JP4 to 1. Slowly increase PS1 to
16V and verify that V
and verify that V is within the V
OUT
Table 1.
4
terminals, then turn on PS1
IN
is within
OUT
is off. Increase PS1 to 19V
OUT
1.8V range of
OUT
6. Decrease PS1 to 0V and disconnect PS1 from V
the current limit of PS1 to 25mA as described above.
7. Connect PS1 to AC1 and slowly increase PS1 volt-
age to 2.0V while monitoring the input current. If the
current remains less than 5mA, increase PS1 to 19V.
Verify voltage on V
OUT
Table 1.Decrease PS1 to 0V, swap the AC1 connection
to AC2 and repeat the test. Decrease PS1 to 0V and
disconnect PS1 from AC2.
8. Set JP5 to 1, JP6 to 1, and JP7 to 1. Connect PS1 to
the V turret. Increase PS1 to 19V and set LOAD1 to
IN
50mA. Verify voltage on V
range in Table 1. Verify that the output ripple voltage is
between 20mV to 60mV. Set PS1 to 0V and disconnect
PS1.
9. Set JP1 to 1; JP2, JP3, JP4 and JP5 to 0; JP6 and JP7
to 1; PS1 to 0V and disconnect PS1. Connect PS2 to the
BAT Terminals, then turn on PS2 and slowly increase
voltage to 1.0V while monitoring the input current. If
the current remains less than 5mA, increase PS2 to
2.0V. Verify voltage on V
range in Table 1. Verify that the output ripple voltage
is between 20mV to 60mV.
10. Increase PS2 to 3.0V. Verify voltage on V
the V 3.0V range in Table 1. Verify that the output
OUT
ripple voltage is between 20mV to 60mV.
11. Increase PS2 to 5.0V. Verify voltage on V
the V 3.0V range in Table 1. Verify that the output
OUT
ripple voltage is between 20mV to 60mV. Decrease
PS2 to 0V and disconnect PS2.
12. Set the current limit of PS1 to 300mA as described
above. Connect PS1 to the V
1, JP6 to 1 and JP7 to 1. Set PS1 to 14V.Connect a
jumper lead from V
OUT
off. Move JP11 jumper to EN and verify that LDO_OUT
is now 1.2V. Increase Load 2 to 50mA and verify than
LDO is within the 1.2V range in Table 1. Verify that
PGLDO is high.
13. Set JP8 to 1, JP9 to 1, JP10 to 1, verify that LDO_OUT
is slightly below V
OUT
is within the V 1.8V range in
OUT
is within the V
OUT OUT
is within the V
OUT OUT
is within
OUT
is within
OUT
terminals. Set JP5 to
IN
to LDO_IN. Verify that LDO is
. Verify that PGLDO is low.
. Set
IN
5.0V
3.0V
dc2048af