MAX1720 查看數據表（PDF） - ON Semiconductor
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MAX1720 Datasheet PDF : 18 Pages
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MAX1720
Vin
+
1
OSC
2
3
6
5
+
4
−Vout
+
+
+
Capacitors = 10 mF
Figure 22. Negative Output Voltage Doubler
A single device can be used to construct a negative voltage doubler. The output voltage is approximately equal to −2Vin minus
the forward voltage drop of each external diode. The performance characteristics for the above converter are shown below.
Note that curves A and C show the circuit performance with economical 1N4148 diodes, while curves B and D are with lower
loss MBRA120E Schottky diodes.
0
−2.0
−4.0
−6.0
A
B
C
TA = 25°C
Curve
A
B
C
D
Vin (V)
3.0
3.0
5.0
5.0
All Diodes
1N4148
Rout (W)
124
MBRA120E
115
1N4148
96
MBRA120E
94
−8.0
D
−10.0
0
10
20
30
40
Iout, OUTPUT CURRENT (mA)
Figure 23. Doubler Load Regulation, Output Voltage vs. Output Current
Vin
+
1
OSC
2
3
6
5
+
4
−Vout
+
+
+
+
+
Capacitors = 10 mF
Figure 24. Negative Output Voltage Tripler
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