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LTC3766 数据表(PDF) 13 Page - Linear Technology

部件名 LTC3766
功能描述  Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters
Download  48 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3766 数据表(HTML) 13 Page - Linear Technology

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LT8311
13
8311f
For more information www.linear.com/LT8311
OPERATION
TheLT8311controlsthesynchronousMOSFETsandopto-
coupler on the secondary side of a forward converter.
SynchronouscontroloflowRDS(ON)MOSFETscantypically
lead to lower power dissipation in forward converters. The
lower power dissipation can improve converter efficiency,
resultinginlongtermcostsavingsbyloweringinputpower
requirements to support a certain level of output power.
Improved efficiency can also reduce the size of heat sinks
required to dissipate the heat generated in the rectifiers;
consequentlyincreasingtheoperatingambienttemperature
rangewhichmaybeusefulinmanyindustrialapplications.
The LT8311 also offers opto-coupler control for accurate
output voltage regulation over line and load. The LT8311’s
opto-couplercontrolcircuitrycomeswithahostofstart-up
and steady-state functions to ensure robust transient re-
sponseduringpower-onandoutputshort-circuitrecovery.
FUNDAMENTALS OF FORWARD CONVERTER
OPERATION IN CCM
The timing diagram of a forward converter operating in
continuous conduction mode (CCM) is shown in Figure 2.
Thetimingdiagramisbrokenintosixregionsofoperation.
Please refer to Figures 1 and 2 for the following explana-
tion of each region of operation.
Region 1 (Figure 2)
When OUT goes high, M1 turns on. CG should already be
at 0V before OUT goes high, to ensure that MCG does not
cross conduct with M1. The LT8311’s preactive mode,
which will be explained later, is an innovative scheme to
turn off MCG before M1 turns on. FG must be high during
this period to keep the forward MOSFET, MFG on, thereby
conducting the output inductor current, ILOUT, (via the
transformer’s secondary winding) through a low imped-
ance path. During this phase, magnetizing current, ILMAG,
builds up in the transformer’s magnetic core, and flows
from VIN to GND through M1. Output inductor current,
ILOUT, ramps up at a rate of (VCSW – VOUT)/ LOUT.
Region 2 (Figure 2)
When OUT goes low, and turns off M1, the transformer
becomes high impedance, and stops conducting ILOUT.
Since current in the output inductor cannot go to zero
instantaneously, it pulls the drain of the catch MOSFET,
CSW, towards ground. Ultimately CSW gets clamped at a
diode voltage below ground by MCG’s body diode which
nowsourcestheoutputinductorcurrent(similartoacatch
diode in a traditional buck converter). CSW collapsing
equivalently causes the transformer’s secondary winding
voltage to become smaller. Through transformer action,
Figure 1. Forward Converter with Active Clamp Reset (in Red) or Resonant Reset (in Blue)
8311 F01
VIN
VDRAIN_M2
NS
NP
PRIMARY
IC
OUT
VOUT
COUT
LOUT
ILOUT
CSW
SECONDARY
IC
FSW
SWP
ILMAG
LMAG
MFG
M1
RLOAD
MCG
VCL
CCL
AOUT
M2
CAOUT
CRST
D2
FG
CG
ACTIVE CLAMP RESET (RED)
RESONANT RESET (BLUE)
+


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