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LLT3837EFE 数据表(PDF) 13 Page - Linear Technology

部件名 LLT3837EFE
功能描述  Isolated No-Opto Synchronous Flyback Controller
PDF  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LLT3837EFE 数据表(HTML) 13 Page - Linear Technology

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LT3837
13
3837fa
APPLICATIONS INFORMATION
Primary Winding Feedback
The previous work was developed using a separate wind-
ing for voltage feedback. It is possible to use the primary
winding as the feedback winding as well. This can simplify
the design of the transformer.
When using the primary winding the feedback voltage
will be added to the VIN voltage so:
V
VI
ESR R
N
FLYBK
OUT
OUT
DS ON
SP
=
+•
+
()
()
where NSP is the transformer effective secondary to
primary winding turns ratio. Use the circuit of Figure 2
to get more accurate output regulation. In this case the
regulation equations becomes:
R
R
V
VI
ESR R
N
V
FB
OUT
OUT
DS ON
SP
BE
1
2
=•
+•
+
()
−
⎡
⎣
⎢
⎢
()
⎤⎤
⎦
⎥
⎥
where VBE is the base emitter drop of the PNP (approxi-
mately 0.7V).
Likewise the load compensation equation needs to be
changed to use NSP instead of NSF so:
RK
RDC
ESR R
RN
CMP
SENSE
DS ON
SF
=
()
+
1
1
1
•
•–
••
()
•
MS
MP
R2
R1
SECONDARY
PRIMARY
COUT
VIN
VFLYBK
3837 F10
•
LT3837
FB
PG
Figure 2



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