Linear ANALOG DEVICES DC2631A, Demo Manual, Page: 2 / 18

2
DEMO MANUAL
DC2631A-A/DC2631A-B
Rev. 0
QUICK START PROCEDURE
The evaluation setup for demonstration circuit 2631A-A/
A-B is straight forward. Refer to the diagram shown
in Figure 1.
Next, follow the procedure below:
1) With power off, connect the input supply, load and
meters as shown in Figure 1. Preset the load to 0A
and the V
IN
supply to 0V.
2) Place the RUN1, RUN2 and 5V BIAS jumpers in the
ON position.
3) Slowly increase the input voltage to 12.0V while moni-
toring V
OUT1
and/or V
OUT2
.
4) At an input voltage of 12.0V, check V
OUT1
and/or V
OUT2
.
The output voltage(s) should be within the regulation
limits shown in the Performance Summary table.
5) Apply full load to the output(s) and re-measure the out-
put voltages. They should be within the regulation limits.
6) After the basic performance has been verified, the
other aspects of performance can be measured
and observed.
DYNAMIC LOAD CIRCUITS
The DC2631A-A/DC2631B-B provides a load step circuit
for V
OUT1
and V
OUT2
. Each load step circuit consists of a
load step MOSFET with a 2mΩ sense resistor at its source.
To use it, connect the output of a pulse generator between
the PULSE GEN pin and the GND pin. Monitor the load
step signal across the ISTEP
+
and ISTEP
–
pins. Monitor
the output voltage with the V
OUT
BNC. See Figure 2 for the
setup. For safe operation for a 0A to 200A load step, limit
the duty cycle to 5% or less. The load step responses are
shown in Figure 9 through Figure 11.
Note 1:
200 LFM airflow or more is recommended when full load
is applied to both outputs of the -A assembly or when full
load is applied to the output of the -B assembly. Thermal
images are shown in Figure 7 and Figure 8.
Note 2:
When powering the board, first connect the input supply
to the DC2631A. Next, turn-on the input supply. Do not
hot plug. This could cause large input voltage transients
that may damage the converter.
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C, for the -B Assembly
PARAMETER CONDITIONS VALUE
Input Voltage Range 7V to 14V
V
OUT1
V
IN
= 7V to 14V, I
OUT1
= 0A to 200A 1.0V ± 1.5%
I
OUT1
V
IN
= 7V to 14V, V
OUT1
= 1.0V 200A
V
OUT1
Typical Efficiency (See Figure 6) V
IN
= 12V, I
OUT1
= 200A 90.0% Typical
Nominal Switching Frequency 400kHz