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LT3752 Datasheet(PDF) 18 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) 18 Page - Linear Technology

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LT8311
18
8311f
For more information www.linear.com/LT8311
Figure 5. During the Predictive Portion of Preactive Mode, the LT8311 Phase Locks
into the CSW Rising Edge and Turns Off MCG 75ns Prior to This Edge
Figure 6. During the Reactive Portion of Preactive Mode, the LT8311 Turns Off MCG When the Current in MCG, IMCG,
Trips the LT8311’s Internal Current Comparator. The Inputs to the Comparator Are CSP and CSN and the Current Sense
Trip Voltage Is Programmed by Choosing Appropriate CSP/CSN Series Resistors
0V
0V
0V
PRIMARY-SIDE IC
CONTROLS TIMING
OF OUT SIGNAL
LT8311 USES IMCG INFORMATION
TO DETERMINE FG/CG CONTROL
TIMINGS DURING THE REACTIVE
PORTION OF PREACTIVE MODE
WAVEFORMS
IN DCM
WHEN CSP-CSN
TRIPS INTERNAL
CURRENT COMPARATOR
MCG TURNS OFF
8311 F06
OUT
IMCG
CSW
CG
TIME
0A
0A
ILOUT
M1
TURN-ON
EDGE
M1
TURN-ON
EDGE
0V
0V
0V
75ns PREDICTIVE DELAY
PRIMARY-SIDE IC
CONTROLS TIMING
OF OUT SIGNAL
LT8311 USES CSW/FSW INFORMATION
TO DETERMINE FG/CG CONTROL
TIMINGS DURING THE PREDICTIVE
PORTION OF PREACTIVE MODE
WAVEFORMS
IN CCM
8311 F05
OUT
M1
TURN-ON
EDGE
CSW
CG
TIME
M1
TURN-ON
EDGE
MCG
TURN-OFF
EDGE
MCG
TURN-OFF
EDGE
RESET
MECHANISM
PRIMARY IC
OUT
VIN
VOUT
COUT
•
•
LT8311
FSW
CSW
CSP
CG
CSN
LOUT
ILOUT
FG
CSW
FSW
IMCG
NS
NP
MCG
M1
MFG
OPERATION



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