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NCP511SN33T1 Datasheet(PDF) 9 Page - ON Semiconductor

Part # NCP511SN33T1
Description  150 mA CMOS Low Iq Low?묭ropout Voltage Regulator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP511SN33T1 Datasheet(HTML) 9 Page - ON Semiconductor

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NCP511
http://onsemi.com
9
0
3
100
2
120
40
160
Time (ms)
2
1
20
4
1
0
140
80
60
0
TA = 25°C
Vin = 3.5 V
Vout = 3.0 V
R = 1.0 M
W
C = 1.0
mF
R = 1.0 M
W
C = 0.1
mF
No Delay
3
Output
R
1
2
3
5
4
Input
1.0
mF
1.0
mF
Output
1
2
3
5
4
Input
1.0
mF
1.0
mF
Q2
Q1
R3
R1
R2
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
Output
1
2
3
5
4
Input
1.0
mF
1.0
mF
Q1
R
5.6 V
0
100
120
40
160
Time (ms)
20
140
80
60
R = 1.0 M
W
C = 1.0
mF
R = 1.0 mW
C = 0.1
mF
No Delay
Figure 18. Current Boost Regulator
Figure 19. Current Boost Regulator
with Short Circuit Limit
Figure 20. Delayed Turn−on
Figure 21. Delayed Turn−on
Figure 22. Input Voltages Greater than 6.0 V
The NCP511 series can be current boosted with a PNP transis-
tor. Resistor R in conjunction with VBE of the PNP determines
when the pass transistor begins conducting; this circuit is not
short circuit proof. Input/Output differential voltage minimum is
increased by VBE of the pass resistor.
Short circuit current limit is essentially set by the VBE of Q2 and
R1. ISC = ((VBEQ2 − ib * R2) / R1) + IO(max) Regulator
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 21.
The graph shows the delay between the enable signal and
output turn−on for various resistor and capacitor values.
A regulated output can be achieved with input voltages that
exceed the 6.0 V maximum rating of the NCP511 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.
Q1
R
APPLICATION CIRCUITS


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