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AP3776B 데이터시트(PDF) 13 Page - Diodes Incorporated

부품명 AP3776B
상세설명  LOW POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
PDF  17 Pages
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제조업체  DIODES [Diodes Incorporated]
홈페이지  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AP3776B 데이터시트(HTML) 13 Page - Diodes Incorporated

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AP3776B
Document number: DS36737 Rev. 6 - 2
13 of 17
www.diodes.com
December 2015
© Diodes Incorporated
AP3776B
Function Description (Cont.)
VTH(ST)
VFB(SCP)
tOFF(MAX)
VCC
VFB
VOUT
VOUT(SCP)
5V
Figure 6. Normal Start-up
VTH(ST)
VOPR(MIN)
VFB(SCP)
tOFF(MAX)
VCC
VFB
VOUT
0V
Figure 7. Short Circuit Protection (SCP) and Hiccup Mode
4.
RCS Short Protection
When the primary side current sense resistance is shorted, the primary side current rapidly increases, and the transformer saturates, which leads
to
some components’ damage. The AP3776B draws in the RCS short protection to avoid the damage. If the voltage of CS pin is smaller than 0.15V
at the primary side maximum on time tonp(MAX), the RCS short protection is triggered, and the AP3776B immediately shuts down, and then
restarts.
5.
Over Temperature Protection (OTP)
When the IC junction temperature exceeds the thermal shutdown temperature threshold of +130ºC, the device shuts down immediately. Retry is
allowed if junction temperature reduces by hysteresis temperature value.



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