LTC3726 Просмотр технического описания (PDF) - Linear Technology
Номер в каталоге
Компоненты Описание
производитель
LTC3726 Datasheet PDF : 16 Pages
| |||
LTC3726
Secondary-Side Synchronous
Forward Controller
FEATURES
■ Secondary-Side Control for Fast Transient Response
■ Self-Starting Architecture Eliminates Need for
Separate Bias Regulator
■ Proprietary Gate Drive Encoding Scheme Reduces
System Complexity
■ Current Mode Control Ensures Current Sharing
■ PLL Fixed Frequency: 100kHz to 500kHz
■ ±1% Output Voltage Accuracy
■ OPTI-LOOP Compensation
■ Available in a Narrow 16-Lead SSOP Package
U
APPLICATIO S
■ Isolated 48V Telecommunication Systems
■ Internet Servers and Routers
■ Distributed Power Step-Down Converters
■ Automotive and Heavy Equipment
DESCRIPTIO
The LTC®3726 is a secondary-side controller for synchro-
nous forward converters. When used in conjunction with
the LTC3705/LTC3725 gate driver and primary-side con-
trollers, the part creates a complete isolated power supply
that combines the simplicity of OPTI-LOOP® compensa-
tion with the speed of secondary-side control.
The LTC3726 has been designed to simplify the design of
highly efficient, secondary-side forward converters. Work-
ing in concert with the LTC3705 or LTC 3725, the LTC3726
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 LTC3726 is available in a 16-lead SSOP package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
OPTI-LOOP 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 APPLICATIO
36V-72V to 3.3V/20A Isolated Forward Converter
VIN+
1µF
100V
x3
VIN–
Si7852DP
MURS120
T1
••
Si7852DP
Si7336ADP
30mΩ
1W
MURS120
2mΩ
2W
FQT7N10
100k
BAS21 0.22µF
L1: COILCRAFT SER2010-122
T1: PULSE PA0807
T2: PULSE PA0297
365k
1%
NDRV
UVLO
BOOST TG TS BG IS
FB/IN+
T2
••
1µF
2.2µF
25V
VCC
SS/FLT
LTC3705
FS/IN–
15k
1%
33nF
GND PGND VSLMT
162k
33nF
CMPSH1-4
Si7336ADP
×2
L1
1.2Ω 1.2µH
5k
FZT690B
10µF
7.5V
25V
2.2µF
VOUT+
330µF
6.3V
×3
VOUT–
IS– FG
IS+
PT+
SW SG
VCC
LTC3726
PT–
RUN/SS GND PGND SLP
FS/SYNC
FB/PHASE
ITH
MODE
680pF
20k
102k
1%
22.6k
1%
3726 TA01
3726fb
1
Share Link: 