MAX828, MAX829
http://onsemi.com
10
A 3.0 1N4148
B 3.0 MBRA120E
Curve V
in
(V) Diodes
122
114
MAX828
R
out
(W)
C 5.0 1N4148
D 5.0 MBRA120E
96
91
118
106
MAX829
R
out
(W)
90
87
+
5
4
2
3
1
OSC
MAX828: Capacitors = 10 F
MAX829: Capacitors = 3.3 F
+
V
in
−V
out
Figure 33. Negative Output Voltage Tripler
+
+ + ++
A single device can be used to construct a negative voltage tripler. The output voltage is approximately equal to −3V
in
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
−4.0
2010
−6.0
−14.0
30 40
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
Figure 34. Tripler Load Regulation,
Output Voltage vs. Output Current MAX828
A
B
T
A
= 25°C
C
D
02010 30 4
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOLTAGE (V)
Figure 35. Tripler Load Regulation,
Output Voltage vs. Output Current MAX829
A
B
T
A
= 25°C
C
D
−8.0
−2.0
−10.0
−12.0
−4.0
−6.0
−14.0
−8.0
−2.0
−10.0
−12.0
