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Linear - Isolated Secondary Synchronous Rectifier Controller

Numéro de référence LTC1698
Description Isolated Secondary Synchronous Rectifier Controller
Fabricant Linear 
Logo Linear 





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LTC1698 fiche technique
LTC1698
Isolated Secondary
Synchronous Rectifier Controller
FEATURES
s High Efficiency Over Wide Load Current Range
s ±0.8% Output Voltage Accuracy
s Dual N-Channel MOSFET Synchronous Drivers
s Pulse Transformer Synchronization
s Optocoupler Feedback Driver
s Programmable Current Limit Protection
s ±5% Margin Output Voltage Adjustment
s Adjustable Overvoltage Fault Protection
s Power Good Flag
s Auxiliary 3.3V Logic Supply
s Available in 16-Lead SSOP and SO Packages
U
APPLICATIO S
s 48V Input Isolated DC/DC Converters
s Isolated Telecommunication Power Systems
s Distributed Power Step-Down Converters
s Industrial Control Systems
s Automotive and Heavy Equipment
DESCRIPTIO
The LTC®1698 is a precision secondary-side forward
converter controller that synchronously drives external
N-channel MOSFETs. It is designed for use with the
LT®3781 primary-side synchronous forward converter
controller to create a completely isolated power supply.
The LT3781 synchronizes the LTC1698 through a small
pulse transformer and the LTC1698 drives a feedback
optocoupler to close the feedback loop. Output accuracy
of ±0.8% and high efficiency over a wide range of load
currents are obtained.
The LTC1698 provides accurate secondary-side current
limit using an external current sense resistor. The input
voltage at the MARGIN pin provides ±5% output voltage
adjustment. A power good flag and overvoltage input are
provided to ensure proper power supply conditions. An
auxiliary 3.3V logic supply is included that supplies up to
10mA of output current.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN
36V to 72V
Q1
L1
VDD BIAS +
+
COUT
R2
R1
VOUT
D1
T1
Q2 D2
RPRISEN
TG BG
CSG
SG
T2
Q4
Q3
RSECSEN
CSYNC
RSYNC
1 10
2 VDD PWRGD 8
CG VFB
16
FG LTC1698
12
ISNS
6
VCOMP
RC
CC
CFB
11
ISNSGND
13 RCILM
ICOMP
CCILM
15
SYNC
9
OVPIN
7
MARGIN
VMARGIN
R5
R4
LT3781
+ REF
VFB
VC
RF
CF
RE
ISOLATION
BOUNDARY
RK 5
14 VAUX
OPTODRV
VAUX
3.3V
CK PGND GND O.1µF 10mA
34
1681 F01
PLEASE REFER TO FIGURE 12 IN THE TYPICAL APPLICATIONS
SECTION FOR THE COMPLETE 3.3V/15A APPLICATION SCHEMATIC
Figure 1. Simplified 2-Transistor Isolated Forward Converter
1698f
1

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