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NCP100 Datasheet(PDF) 9 Page - ON Semiconductor

Part # NCP100
Description  Sub 1.0 V Precision Adjustable Shunt Regulator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP100 Datasheet(HTML) 9 Page - ON Semiconductor

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NCP100
http://onsemi.com
9
Figure 26. High Current Shunt Regulator
Vin
Vout
R1
R2
Vout + 1 )
R1
R2
V
REF
Figure 27. Low Dropout Series Pass Regulator
Vin
Vout
R1
R2
Vout + 1 )
R1
R2
V
REF
Rin
Vout min + 0.9 V ) Vbe
Vout min + VREF
AC Line
Input
Figure 28. Offline Converter with Isolated DC Output
1/2
Opto
NCP
100
Isolated
DC
Output
1/2
Opto
UC3842
Minimum Vout = (0.9 + 1.4) = 2.3 V
S
R
Q
R1
R2
+
The circuit in Figure 28 uses the NCP100 as a
compensated amplifier for controlling the feedback loop of
an isolated output line powered converter. This device
allows the converter to directly regulate the output voltage
at a significantly lower level than obtainable with the
common TL431 device family. The output voltage is
programmed by the resistors R1 and R2. The minimum
regulated DC output is limited to the sum of the lowest
allowable cathode to anode voltage (0.9 V) and the forward
drop of the optocoupler light emitting diode (1.4 V).


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