Demo Manual DC366A
LTC3200 Constant Frequency Charge Pump
QUICK START GUIDE
DC366A is set up to easily evaluate the
LTC3200 low noise charge pump. Refer to
Figure 1 for equipment setup and follow
the procedure outlined below.
•
Before turning on the power
supply connect a 3.3V, 500mA
bench supply to the VIN and GND
(E1 and E2) terminals as shown in
Figure 1.
Ensure that jumpers JP2 and JP3
are installed on the board. Set
jumper JP1 in the “ON” position.
Turn on the input supply and
observe that the white LEDs light
up. The VFB voltage should
measure approximately 1.25V.
•
When measuring the input/output
voltage ripple care must be taken
to avoid a long ground return for
the oscilloscope probe. After
removing the grabber and outer
plastic sleeve from the scope
probe, measure the input ripple by
touching the probe between VIN
and GND (E1 to E2). Measure the
output ripple by touching the
probe between VOUT and GND
(E4 to E5) as shown in Figure 2.
•
•
+
V
-
-
V
+
Figure 1 DC366A Test and Measurement Setup
MEASURING VIN
RIPPLE
MEASURING VOUT
RIPPLE
Figure 2 Proper Noise Measurement Technique
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