NCP500(2004) Ver la hoja de datos (PDF) - ON Semiconductor
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Fabricante
NCP500 Datasheet PDF : 20 Pages
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NCP500
Battery or
Unregulated
Voltage
+
C1
1
2
ON
3
OFF
Vout
5
+
C2
4
Figure 27. Typical Application Circuit
ON
OFF
1
2
Battery or
Unregulated
3
Voltage
+
C1
6
5
Vout
4
+
C2
Figure 28. Typical Application Circuit
10
UNSTABLE
1
STABLE
0.1
Cout = 1 mF to 10 mF
TA = 40°C to 125°C
Vin = up to 6.0 V
0.01
0
25
50
75
100
125 150
IO, Output Current (mA)
Figure 29. Stability
Input
Q1
R
1
1.0 mF
2
3
Input
R1
Q1
R2
Q2
R3
Output
5
1
1.0 mF
1.0 mF
2
4
3
Output
5
1.0 mF
4
Figure 30. Current Boost Regulator
The NCP500 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.
Figure 31. Current Boost Regulator with Short
Circuit Limit
Short circuit current limit is essentially set by the VBE of Q2 and
R1. ISC = ((VBEQ2 − ib * R2) / R1) + IO(max) Regulator
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