3
dc1997a-af
DEMO MANUAL
DC1997A-A/DC1997A-B
QUICK START PROCEDURE
Dynamic Load Circuit (Optional)
Demonstration circuit DC1997A-A/DC1997A-B provides
a simple load-step circuit consisting of a MOSFET and
sense resistor for each rail. To apply a load step, follow
the steps below.
1. Pre-set the amplitude of a pulse generator to 0.0V and
the duty cycle to 5% or less.
2. Connect the scope to the VOUT BNC connectors for
the rail under test with a coax cable. To monitor the
load-step current, connect the scope probe across the
ISTEP+/- turrets for that rail.
3. Connect the output of the pulse generator to the PULSE
turret for the rail under test and connect the return to
the adjacent GND turret.
4. With the converter running, slowly increase the am-
plitude of the pulse generator output to provide the
desired load step pulse height. The scaling for the load
step signal is 5mV/Amp.
Figure 1. Proper Measurement Equipment Setup
A
V
OUT2
LOAD
I
OUT2
I
IN
+
–
A
V
OUT1
LOAD
I
OUT1
+
–
V
+
–
V
+
–
V
OUT2
*
V
OUT1
*
DC1997A F01
V
IN
SUPPLY
*MONITOR THE OUTPUT VOLTAGE ACROSS
EITHER COUT2 OR COUT7 FOR ACCURATE
EFFECIENCY MEASUREMENTS
V
IN
+
–
V
+
–
A
