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NCV1729SN35T1G
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P23
NCP1729
www
.onsemi.com
7
6
4
2
3
1
OSC
Capacitors = 3.3
m
F
+
+
V
in
5
+
−V
out
Figure 18. V
oltage Inverter
The NCP1729 primary function is a voltage inverter
. The device
will convert
5.0
V
into
−5.0
V with light loads. T
wo
capacitors are required for the inverter to function. A third capacitor
, the input bypass capacitor, may be required depending
on the power source for the inverter
. The performance for this device is illustrated below
.
Figure 19. V
oltage Inverter Load Regulation,
Output V
oltage vs. Output Current
0
−2.0
30
−5.0
20
10
V
out
, OUTPUT VOL
T
AGE (V)
−6.0
0
I
out
, OUTPUT CURRENT (mA)
−4.0
−3.0
−1.0
40
50
T
A
= 25
°
C
V
in
= 3.3 V
V
in
= 5.0 V
NCP1729
www
.onsemi.com
8
Figure 20. Cascaded Devices for Increased Negative Output V
oltage
+
6
4
2
3
1
OSC
Capacitors = 3.3
m
F
+
V
in
5
+
6
4
2
3
1
OSC
+
5
−V
out
+
T
wo or more devices can be cascaded for increased output voltage. Under light load conditions, the output voltage is
approximately equal to −V
in
times the number of stages. The converter output resistance increases dramatically with each
additional
stage. This is due to a reduction of input voltage to each successive stage as the converter output is loaded. Note that
the ground connection for each successive stage must connect to the negative output of the previous stage. The performance
characteristics for a converter consisting of two cascaded devices are shown below
.
Figure 21. Cascade Load Regulation, Output
V
oltage vs. Output Current
−2.0
−4.0
−1.0
−5.0
−3.0
−10.0
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOL
T
AGE (V)
02
0
4
0
−6.0
−7.0
−8.0
−9.0
10
30
A
B
T
A
= 25
°
C
A
5.0
145
B
3.0
180
Curve
V
in
(V)
R
out
(
W
)
NCP1729
www
.onsemi.com
9
+
6
4
2
3
1
OSC
Capacitors = 3.3
m
F
+
+
V
in
5
+
+
−V
out
Figure 22. Negative Output V
oltage Doubler
A single device can be used to construct a negative voltage doubler
. The output voltage is approximately equal to −2.0 V
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
0
−2.0
20
10
−4.0
−6.0
−10.0
30
40
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOL
T
AGE (V)
−8.0
Figure 23. Doubler Load Regulation,
Output V
oltage vs. Output Current
A
B
T
A
= 25
°
C
C
D
A
3.0
1N4148
B
3.0
MBRA120E
Curve
V
in
(V)
All Diodes
11
8
107
R
out
(
W
)
C
5.0
1N4148
D
5.0
MBRA120E
91
85
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P23
NCV1729SN35T1G
Mfr. #:
Buy NCV1729SN35T1G
Manufacturer:
ON Semiconductor
Description:
Inverters SW CAP VOLTAGE INVER
Lifecycle:
New from this manufacturer.
Delivery:
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