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LT3752 Datasheet(PDF) 14 Page - Linear Technology

Part # LT3752
Description  Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters
PDF  48 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3752 Datasheet(HTML) 14 Page - Linear Technology

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LT8311
14
8311f
For more information www.linear.com/LT8311
OPERATION
Figure 2. Active Clamp Forward Converter Timing Diagram in CCM. Resonant Reset Waveforms in Blue
D • tPER
tPER
AOUT
VGATE M2
(M2 SOURCE = 0V)
OUT
(M1 SOURCE = 0V)
SWP
ILMAG
CSW
CG
0.7 (CLAMPED BY D2)
0.7 (CLAMPED BY D2)
M2 OFF
M2 OFF
M2 ON
M2 ON
M1 ON
0.7V
∼VIN
M1 ON
M1 OFF
0V
0V
0V
0V
TIME
0V
0V
0V
0A
0V
0V
0V
0V
0V
0V
0V
MCG OFF
MCG ON
MCG OFF
MCG ON
MFG ON
MFG OFF
MFG ON
MFG OFF
M1 OFF
FSW
FG
ILOUT
ACTIVE CLAMP
PMOS CONTROL
SIGNAL
ACTIVE CLAMP
PMOS GATE
PRIMARY NMOS
SWITCH GATE
PRIMARY-SIDE
WAVEFORMS
SECONDARY-SIDE
WAVEFORMS
PRIMARY NMOS
SWITCH DRAIN
TRANSFORMER
MAGNETIZING
INDUCTANCE
CURRENT
CATCH FET DRAIN
CATCH FET GATE
FORWARD FET
DRAIN
FORWARD FET
GATE
OUTPUT INDUCTOR
CURRENT
REGIONS OF
OPERATION
0.7V
0.7V
8311 F02
di
dt
=
VIN
LMAG
di
dt
= −
1
LMAG
•
VIN •D
1
−D
VIN •D • tPER
LMAG
VOUT • tPER
2 • LMAG •CRST
di
dt
=
VCSW −VOUT
LOUT
di
dt
=
–VOUT
LOUT
VOUT
RLOAD
VOUT •(1−D)• tPER
LOUT
∼VIN •
NS
NP
VOUT
1
−D
VIN
1
−D
2
3
1
4
6
5
LMAG •CRST
tRES=π
VIN
(
1
+
D • tPER)
2 LMAG•CRST



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