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LTC3706IGN-TRPBF

Description
Secondary-Side Synchronous Forward Controller with PolyPhase Capability
File Size188KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3706IGN-TRPBF Overview

Secondary-Side Synchronous Forward Controller with PolyPhase Capability

FEATURES
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LTC3706
Secondary-Side Synchronous
Forward Controller with
PolyPhase Capability
DESCRIPTION
The LTC
®
3706 is a PolyPhase capable secondary-side
controller for synchronous forward converters. When used
in conjunction with the LTC3705 gate driver and primary-
side controller, the part creates a complete isolated power
supply that combines the power of PolyPhase operation
with the speed of secondary-side control.
The LTC3706 has been designed to simplify the design
of highly efficient, secondary-side forward converters.
Working in concert with the LTC3705, the LTC3706 forms
a robust, self-starting converter that eliminates the need
for the separate bias regulator that is commonly used in
secondary-side control applications. In addition, a pro-
prietary scheme is used to multiplex gate drive signals
and DC bias power across the isolation barrier through a
single, tiny pulse transformer.
The LTC3706 provides remote sensing, accurate power
good and overvoltage monitoring circuits to support preci-
sion, high current applications. A linear regulator controller
with thermal protection is also provided to simplify the
generation of secondary-side bias voltage.
The LTC3706 is available in a 24-lead SSOP package.
Secondary-Side Control for Fast Transient Response
Self-Starting Architecture Eliminates Need for
Separate Bias Regulator
Proprietary Gate Drive Encoding Scheme Reduces
System Complexity
PolyPhase
®
Operation Reduces C
IN
Requirements
Current Mode Control Ensures Current Sharing
PLL Fixed Frequency: 100kHz to 500kHz
±1%
Output Voltage Accuracy
True Remote Sense Differential Amplifier
Power Good Output Voltage Monitor
High Voltage Linear Regulator Controller
Wide Supply Range: 5V to 30V
Available in a Narrow 24-Lead SSOP Package
APPLICATIONS
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Isolated 48V Telecommunication Systems
Internet Servers and Routers
Distributed Power Step-Down Converters
Automotive and Heavy Equipment
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PolyPhase is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6144194, other patents pending.
TYPICAL APPLICATION
36V-72V to 3.3V/20A Isolated Forward Converter
V
IN+
Si7852DP
MURS120
1μF
100V
3
Si7852DP
Si7336ADP
MURS120
30mΩ
1W
2mΩ
2W
CZT3019
FQT7N10
100k
BAS21 0.22μF
L1: COILCRAFT SER2010-122
T1: PULSE PA0807
T2: PULSE PA0297
TS BG IS
FB/IN
LTC3705
FS/IN
GND PGND VSLMT
162k
33nF
+
T1
1.2Ω
Si7336ADP
2
L1
1.2μH
V
OUT+
CMPSH1-4
330μF
6.3V
3
V
IN–
10μF
25V
V
OUT–
2.2μF
16V
102k
1%
365k
1%
NDRV
UVLO
2.2μF
25V
V
CC
SS/FLT
BOOST TG
1μF
T2
I
S–
I
S+
PT
+
FG
SW SG
V
IN
NDRV
V
CC
FS/SYNC
FB
LTC3706
ITH
680pF
22.6k
1%
3706 TA01
15k
1%
PT
RUN/SS GND PGND PHASE SLP MODE REGSD
33nF
20k
3706fb
1

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Description Secondary-Side Synchronous Forward Controller with PolyPhase Capability Secondary-Side Synchronous Forward Controller with PolyPhase Capability Secondary-Side Synchronous Forward Controller with PolyPhase Capability Secondary-Side Synchronous Forward Controller with PolyPhase Capability Secondary-Side Synchronous Forward Controller with PolyPhase Capability
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