NCP431A(2016) データシートの表示（PDF） - ON Semiconductor
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NCP431A Datasheet PDF : 17 Pages
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NCP431A, SC431A, NCP431B, SC431B, NCP432B, SC432B Series
Figure 36. Knee of Reference
Regulator with TL431 or other references in secondary
side of a SMPS needs bias resistor to increase cathode
current to reach high and stable gain (refer to Figure 37).
This bias resistor does not have to be used in regulator with
NCP431/NCP432 thanks to its low minimum cathode
current.
Figure 37. SMPS Secondary Side and Feedback
Connection on Primary Side
The NCP431/NCP432 operates with very low leakage
and reference input current. Sum of these currents is lower
than 100 nA. Regulator with the NCP431/NCP432
minimizes parasitic power consumption.
The best way to achieve extremely low no−load
consumption in SMPS applications is to use
NCP431/NCP432 as regulator on the secondary side. The
consumption is reduced by minimum parasitic consumption
and very low bias current of NCP431/NCP432.
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