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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
16
+
6
4
2
3
1
OSC
+
V
in
5
−V
out
Q
1
C
3
−V
out
= V
in
−V
BE(Q1)
−
V
BE(Q2)
−2 V
F
+
C
2
Q
2
C
1
C
1
= C
2
= 470
m
F
C
3
= 220
m
F
Q
1
= PZT751
Q
2
= PZT651
Figure 37. External Switch for Increased Negative Output Current
The output current capability of the NCP1729 can be extended beyond 600 mA with the addition of two external switch
transistors
and two Schottky diodes. The output voltage is approximately equal to −V
in
minus the sum of the base emitter drops
of both transistors and the forward voltage of both diodes. The performance characteristics for the converter are shown below
.
Note that the output resistance is reduced to 1.0
W
.
−2.6
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOL
T
AGE (V)
0
0.4
0.5
0.3
0.2
0.1
0.6
−3.2
−2.4
−2.8
−2.2
−2.0
Figure 38. Current Boosted Load Regulation,
Output V
oltage vs. Output Current
V
in
= 5.0 V
R
out
= 1.0
W
T
A
= 25
°
C
−3.0
NCP1729
www
.onsemi.com
17
+
6
4
2
3
1
OSC
+
V
in
5
−V
out
Q
1
C
3
+
C
2
Q
2
C
1
C
1
= C
2
= 470
m
F
C
3
= 220
m
F
Q
1
= PZT751
Q
2
= PZT651
Figure 39. Line and Load Regulated Negative Output V
oltage with High Current Capability
R
1
R
2
10 k
This
converter is a combination of Figures 37
and 3
2.
I
t
provides a line and load
regulated output of
−2.47 V at up to 300 mA
with an input voltage of 5.0 V
. The output will regulate at a level of −V
ref
(R
2
/R
1
+ 1). The performance characteristics are
shown
below
. Note that the dashed line is the open loop and the solid line is the closed loop configuration for the load regulation.
−2.6
I
out
, OUTPUT CURRENT (A)
V
out
, OUTPUT VOL
T
AGE (V)
0
0.4
0.5
0.3
0.2
0.1
0.6
−3.2
−2.4
−2.8
−2.2
−2.0
Figure 40. Current Boosted Load Regulation,
Output V
oltage vs. Output Current
V
in
= 5.0 V
R
out
= 1.0
W
R
1
= R
2
= 10 k
W
T
A
= 25
°
C
−3.0
−1.6
V
in
, INPUT VOL
T
AGE (V)
V
out
, OUTPUT VOL
T
AGE (V)
2.5
4.5
5.0
4.0
3.5
3.0
5
.5
−2.6
−1.1
−2.1
−0.6
−0.1
Figure 41. Current Boosted Line Regulation,
Output V
oltage vs. Output Current
I
out
= 100 mA
R
1
= R
2
= 10 k
W
T
A
= 25
°
C
NCP1729
www
.onsemi.com
18
Figure 42. Positive Output V
oltage Doubler with High Current Capability
+
6
4
2
3
1
OSC
+
V
in
5
V
out
Q
1
C
3
+
C
2
Q
2
C
1
Capacitors = 220
m
F
Q
1
= PZT751
Q
2
= PZT651
50
50
The NCP1729 can be configured to produce a positive output voltage doubler with current capability of 500 mA. This is
accomplished
with the addition of two external switch transistors and two Schottky diodes. The output voltage is approximately
equal to 2.0 V
in
minus the sum of the base emitter drops of both transistors and the forward voltage of both diodes. The
performance characteristics for the converter is shown below
. Note that the output resistance is reduced to 1.8
W
.
8.0
I
out
, OUTPUT CURRENT (mA)
V
out
, OUTPUT VOL
T
AGE (V)
0
0.4
0.5
0.3
0.2
0.1
7.2
8.4
7.6
8.8
Figure 43. Positive Doubler with Current Boosted
Load Regulation, Output V
oltage vs. Output Current
V
in
= 5.0 V
R
out
= 1.8
W
T
A
= 25
°
C
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.
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