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dc1936afa
DEMO MANUAL DC1936A
QUICK START PROCEDURE
Figure 2. Power Test Setup for DC1936A
Measuring Efficiency for DC1936A (See Figure 2)
To accurately measure efficiency of any configuration, do
the following:
n
Set JP3 and JP4 to OFF position to disable the auxiliary
circuits.
n
Turn on one channel only.
n
Apply external 5V from E21 to E22 as the driver supply
for DrMOS.
n
Apply external 5V from E5 to E29 as V
CC
for LTC3882.
n
Measure V
IN
across the input ceramic capacitor (C6 for
CH1, C39 for CH0). Measure V
OUT
across the output
ceramic capacitor (C45 for CH1, C10 for CH0).
n
The efficiency is calculated as:
Efficiency
=
V
OUT
•I
OUT
V
IN
•I
IN
+
V
DR
•I
DR
+
V
CC
•I
CC
•100%
Measuring Output Ripple Voltage
An accurate ripple measurement may be performed by
using the configuration across C10 as shown in Figure 3.
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