NCP100 Ver la hoja de datos (PDF) - ON Semiconductor

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NCP100

Sub 1.0 V Precision Adjustable Shunt Regulator

ON Semiconductor 

Rin

Vin

NCP100

Vout

Vin

R1

Vout

R1

R2

ǒ Ǔ Vout +

1

)

R1

R2

VREF

Vout min + 0.9 V ) Vbe

Figure 26. High Current Shunt Regulator

R2

ǒ Ǔ Vout +

1

)

R1

R2

VREF

Vout min + VREF

Figure 27. Low Dropout Series Pass Regulator

AC Line

Input

1/2

Opto

UC3842

+

S

Q

R

1/2

Opto

NCP

100

R1

Isolated

DC

Output

R2

Minimum Vout = (0.9 + 1.4) = 2.3 V

Figure 28. Offline Converter with Isolated DC Output

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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