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dc1632af
DEMO MANUAL DC1632A
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
Demonstration circuit 1632A is easy to set up to evalu-
ate the performance of the LTC3839EUH. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below.
1) With power off, connect the input supply, load and me-
ters as shown in Figure 1. Preset the load to 0A and V
IN
supply to 0V. Place jumpers in the following positions:
JP1
RUN
ON
JP3
MODE
FCM
2) Adjust the input voltage to be between 4.5V and 14V.
V
OUT
should be 1.5V ±2%.
3) Next, apply 40A load and re-check V
OUT
.
4) Once the DC regulation is confirmed, observe the output
voltage ripple, load step response, efficiency and other
parameters.
Note 1. Use the BNC connector labeled V
OUT
to measure
the output voltage ripple.
Note 2. Do not apply the load from the pin to
the VO_SNS– pin. This may damage the converter. These
pins are only intended to monitor the voltage across the
bulk output capacitors at C
OUT
1-4.
Load Step Testing (Optional)
Demonstration circuit 1632A 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± pins.
3) Connect the output of the pulse generator to the PULSE
GEN pin and connect the return to the GND pin.
4) With the converter running, slowly increase the ampli-
tude of the pulse generator output to provide the desired
load step pulse height. The scaling for the LOAD STEP
signal is 5mV/Amp.
V
IN
SUPPLY
I
OUT
LIN
V
OUT
*
V
IN
* MONITOR THE VOLTAGE ACROSS C
OUT5
FOR
ACCURATE EFFICIENCY MEASUREMENTS.
V
OUT
LOAD
+
–
+
+
–
–
+
–
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