NCP1729_06 ONSEMI [ON Semiconductor], NCP1729_06 Datasheet - Page 13

• Manufacturer Part Number: NCP1729_06
• Description: Switched Capacitor Voltage Inverter
• Manufacturer: ONSEMI [ON Semiconductor]

the converter’s output resistance and dramatically enhances the load regulation. For closed loop operation, the desired
regulated output voltage must be lower in magnitude than −V
that the shutdown input voltage threshold is typically 0.5 V
proportional to the converter’s input. This characteristic will not present a problem when used in applications with constant
input voltage. In this case the zener breakdown was measured at 25 mA. The performance characteristics for the above
converter are shown below. Note that the dashed curve sections represent the converter’s open loop performance.
A zener diode can be used with the shutdown input to provide closed loop regulation performance. This significantly reduces
−1.0
−2.0
−3.0
−4.0
−5.0
0
Figure 31. Load Regulation, Output Voltage vs.
T
A
= 25°C
10
I
out
20
, OUTPUT CURRENT (mA)
Output Current
V
in
30
Figure 30. Load Regulated Negative Output Voltage
+
40
A
1
2
3
50
B
Capacitors = 3.3 mF
OSC
60
http://onsemi.com
NCP1729
70
13
6
5
4
in
100 k
. The output will regulate at a level of −V
in
and therefore, the regulated output voltage will change
+
+
Curve
A
B
−V
out
V
in
3.3
5.0
(V)
V
Z
3.9
6.5
z
+ V
(V)
th(SHDN)
V
out
−2.1
−3.8
. Note
(V)