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dc1635afc
DEMO MANUAL DC1635A
QUICK START PROCEDURE
Demonstration circuit 1635A is easy to set up to evaluate
the performance of LTC4412 and LTC4414. Refer to Figure
1 for proper measurement equipment setup of both circuits
and follow the procedures below.
LTC4412 Circuit
1. With all power off, connect auxiliary (V
AUX1
) and primary
(V
IN1
) power supplies capable of 2A each, the system
load and meters as shown in Figure 1.
2. Preset the system load to 0A and the input supplies to
0V, 0A current limit.
3. Connect the system load to the output terminals, V
OUT1
and GND1.
4. Turn on the supplies, setting the current limit up to 2A.
Adjust the voltages to the desired value, up to 18V. The
higher voltage of the two supplies should appear at the
output.
5. Turn the load on and adjust as necessary.
6. Adjust the supplies and observe how the output switches
over to follow the higher voltage of the two sources.
LTC4414 Circuit
1. With all power off, connect auxiliary (V
AUX2
) and primary
(V
IN2
) power supplies capable of 8A each, the system
load, and meters as shown in Figure 1.
2. Preset the system load to 0A and the input supplies to
0V, 0A current limit.
3. Connect the system load to the output terminals, V
OUT2
and GND2.
4. Turn on the supplies, setting the current limit up to 8A.
Adjust the voltages to the desired value, up to 36V. The
higher voltage of the two supplies should appear at the
output.
5. Turn the load on and adjust as necessary.
6. Adjust the supplies and observe how the output switches
over to follow the higher voltage of the two sources.
Optional
7. For improved current handling, install additional MOS-
FETs, select from different package footprints, or shunt
the two circuits at V
IN
, V
OUT
and GND.
8. For source-load back-to-back isolation, remove jumpers
JMP1 and JMP2, and/or JMP3 and JMP4, then install
additional MOSFETs back-to-back as shown in Figure 2.
9. For external control of the primary source power path,
remove the 0Ω jumper on the CTL1 or CTL2 pin, R2 or
R5 respectively. Apply the logic-control signal on CTL1
or CTL2 as necessary.
