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NCP500SQL50T1 Datenblatt(PDF) 16 Page - ON Semiconductor

Teilenummer NCP500SQL50T1
Bauteilbeschribung  150 mA CMOS Low Noise Low?묭ropout Voltage Regulator
PDF  20 Pages
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
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NCP500SQL50T1 Datenblatt(HTML) 16 Page - ON Semiconductor

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NCP500
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Output
1
2
3
5
4
Input
1.0
mF
1.0
mF
Q1
R
5.6 V
A regulated output can be achieved with input voltages that ex-
ceed the 6.0 V maximum rating of the NCP500 series with the
addition of a simple pre−regulator circuit. Care must be taken
to prevent Q1 from overheating when the regulated output
(Vout) is shorted to Gnd.
Output
1
2
3
5
4
Input
1.0
mF
1.0
mF
Output
1
2
3
5
4
Enable
1.0
mF
1.0
mF
C
0
3
3
80
2.5
2
90
40
30
110
Time (ms)
2
1
1.5
20
4
1
0.5
0
100
70
60
50
10
0
TA = 25°C
Vin = 3.4 V
Vout = 2.8 V
R = 1.0 M
W
C = 1.0
mF
R = 1.0 M
W
C = 0.1
mF
No Delay
If a delayed turn−on is needed during power up of several volt-
ages then the above schematic can be used. Resistor R, and
capacitor C, will delay the turn−on of the bottom regulator. A
few values were chosen and the resulting delay can be seen in
Figure 33.
The graph shows the delay between the enable signal and
output turn−on for various resistor and capacitor values.
R
Figure 32. Delayed Turn−on
Figure 33. Delayed Turn−on
Figure 34. Input Voltages Greater than 6.0 V



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