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M51995AFP 데이터시트(PDF) 36 Page - Renesas Technology Corp

부품명 M51995AFP
상세설명  Switching Regulator Control
PDF  43 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M51995AFP 데이터시트(HTML) 36 Page - Renesas Technology Corp

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M51995AP/AFP
REJ03D0835-0300 Rev.3.00 Jun 06, 2008
Page 34 of 40
M51995A
VOUT
VF
RVFFB
CVFFB
Figure 33 Feed Back Loop through Low Pass Filter from VOUT to VF Terminal
Figure 34 shows how to control the knee point where the frequency becomes decrease,
From
VOUT
To VF
From
VOUT
To VF
From
VOUT
To VF
To make the knee
point high
To make the knee
point low
Figure 34 How to Control the Knee Point
(2) In case of fly back system
The DC output voltage of SMPS depends on the VCC Voltage of type M51995A when the polarity of the third
winding is negative and the system is fly back. So the operation of type M51995A will stop when the VCC
becomes lower than “Operation-stop voltage” of M51995A when the DC output voltage of SMPS decreases
under specified value at over load condition.
DC Output Current
Point that VCC voltage
or third winding
voltage decreases
under "Operation-Stop Voltage"
Figure 35 Over Current Limiting Curve on Fly Back System
M51995A
VCC
Collector
VF
R1
R2
CVCC
+
Figure 36 Circuit Diagram to make Knee Point Low on Fly Back System



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