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NCP1014AP065G Folha de dados(PDF) 12 Page - ON Semiconductor

Nome de Peças NCP1014AP065G
Descrição Electrónicos  Self?뭆upplied Monolithic Switcher for Low Standby?뭁ower Offline SMPS
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1014AP065G Folha de dados(HTML) 12 Page - ON Semiconductor

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NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
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Figure 18. A more detailed view of the NCP101X offers better insight on how to
properly wire an auxiliary winding.
Startup Source
Drain
+
--
--
+
VCCON =8.5 V
VCCOFF =7.5 V
+
VCC
Rlimit
+
--
+
I > 7.4m
(Typ.)
+
+
CVcc
Caux
Laux
Ground
+
Vclamp = 8.7 V typ.
Permanent
Latch
D1
Figure 19. The burst frequency becomes so low that it is difficult to keep
an adequate level on the auxiliary VCC ...
>30 ms
Lowering the Standby Power with Skip--Cycle
Skip--cycle offers an efficient way to reduce the standby
power by skipping unwanted cycles at light loads.
However, the recurrent frequency in skip often enters the
audible range and a high peak current obviously generates
acoustic noise in the transformer. The noise takes its origins
in the resonance of the transformer mechanical structure
which is excited by the skipping pulses. A possible
solution, successfully implemented in the NCP1200 series,
also authorizes skip--cycle but only when the power
demand has dropped below a given level. At this time, the
peak current is reduced and no noise can be heard.
Figure 20 pictures the peak current evolution of the
NCP101X entering standby.


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