Applications Information - Linear Technology DC2235A Demo Manual

DEMO MANUAL DC2235A
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APPLICATIONS INFORMATION

Figure 3 illustrates the voltage loss from the ideal boost
charge pump output voltage of 2 • V
+
V voltage. Figure 4 illustrates the voltage loss from
OUT
3.0
V = 10V
IN_P
2.5
2.0
1.5
1.0
0.5
0
0.1 1
LOAD CURRENT (mA)
+
Figure 3. V Voltage Loss vs Output Current
OUT
(Constant-Frequency Mode)
4
Figure 2. Measuring Input or Output Ripple
to the measured
IN_P
R = 200kΩ
T
R = 1.2MΩ
T
R = GND
T
10 100
DC2235A F03
the ideal inverting charge pump output voltage of –V
–
to the measured V voltage.
OUT
3.0
V = V
IN_P IN_N
2.5
2.0
1.5
1.0
0.5
0
0.1
LOAD CURRENT (mA)
–
Figure 4. V Voltage Loss vs Output Current
OUT
(Constant-Frequency Mode)
= 10V R = 200kΩ
T
R = GND
T
R = 1.2MΩ
T
1 10 100
DC2235A F04
IN_N
dc2235af