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LTC1698

Description
Isolated Secondary Synchronous Rectifier Controller
File Size1MB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1698 Overview

Isolated Secondary Synchronous Rectifier Controller

LTC1698
Isolated Secondary
Synchronous Rectifier Controller
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
High Efficiency Over Wide Load Current Range
±0.8%
Output Voltage Accuracy
Dual N-Channel MOSFET Synchronous Drivers
Pulse Transformer Synchronization
Optocoupler Feedback Driver
Programmable Current Limit Protection
±5%
Margin Output Voltage Adjustment
Adjustable Overvoltage Fault Protection
Power Good Flag
Auxiliary 3.3V Logic Supply
Available in 16-Lead SSOP and SO Packages
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.
APPLICATIO S
s
s
s
s
s
48V Input Isolated DC/DC Converters
Isolated Telecommunication Power Systems
Distributed Power Step-Down Converters
Industrial Control Systems
Automotive and Heavy Equipment
TYPICAL APPLICATIO
V
IN
36V to 72V
L1
+
Q1
D1
V
DD
BIAS
C
OUT
+
1
10
V
DD
CG
FG
I
SNS
R1
R2
T1
Q4
Q2
R
PRISEN
R
SECSEN
11
C
SG
TG BG
C
SYNC
15
T2
D2
Q3
2
16
12
PWRGD
8
V
FB
C
FB
V
COMP
6
LTC1698
I
SNSGND
SYNC
I
COMP
OVPIN
13
9
R
CILM
SG
R
SYNC
MARGIN
7
V
MARGIN
V
AUX
3.3V
10mA
LT3781
R
K
REF
V
FB
R
E
C
K
5
OPTODRV
PGND
3
V
AUX
GND
4
14
O.1µF
1681 F01
V
C
R
F
+
C
F
ISOLATION
BOUNDARY
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
U
V
OUT
R
C
C
C
R5
C
CILM
R4
U
U
1

LTC1698 Related Products

LTC1698 1698 1698I LTC1698ES LTC1698EGN LTC1698IGN LTC1698IS
Description Isolated Secondary Synchronous Rectifier Controller Isolated Secondary Synchronous Rectifier Controller Isolated Secondary Synchronous Rectifier Controller Isolated Secondary Synchronous Rectifier Controller Isolated Secondary Synchronous Rectifier Controller Isolated Secondary Synchronous Rectifier Controller Isolated Secondary Synchronous Rectifier Controller
Brand Name - - - Linear Technology Linear Technology Linear Technology Linear Technology
Is it Rohs certified? - - - incompatible incompatible incompatible incompatible
Parts packaging code - - - SOIC SSOP SSOP SOIC
package instruction - - - SOP, SSOP, SSOP, SOP,
Contacts - - - 16 16 16 16
Manufacturer packaging code - - - S GN GN S
Reach Compliance Code - - - _compli _compli not_compliant not_compliant
ECCN code - - - EAR99 EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types - - - SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode - - - CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology - - - PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage - - - 12.6 V 12.6 V 12.6 V 12.6 V
Minimum input voltage - - - 6 V 6 V 6 V 6 V
Nominal input voltage - - - 8 V 8 V 8 V 8 V
JESD-30 code - - - R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16
JESD-609 code - - - e0 e0 e0 e0
length - - - 9.9 mm 4.9 mm 4.9 mm 9.9 mm
Humidity sensitivity level - - - 1 1 1 1
Number of functions - - - 1 1 1 1
Number of terminals - - - 16 16 16 16
Maximum operating temperature - - - 70 °C 70 °C 85 °C 85 °C
Package body material - - - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - - - SOP SSOP SSOP SOP
Package shape - - - RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form - - - SMALL OUTLINE SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE
Peak Reflow Temperature (Celsius) - - - 235 235 235 235
Certification status - - - Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height - - - 1.75 mm 1.75 mm 1.75 mm 1.75 mm
surface mount - - - YES YES YES YES
Switch configuration - - - SINGLE SINGLE SINGLE SINGLE
Temperature level - - - COMMERCIAL COMMERCIAL INDUSTRIAL INDUSTRIAL
Terminal surface - - - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - - - GULL WING GULL WING GULL WING GULL WING
Terminal pitch - - - 1.27 mm 0.635 mm 0.635 mm 1.27 mm
Terminal location - - - DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature - - - 20 20 20 20
width - - - 3.9 mm 3.9116 mm 3.9116 mm 3.9 mm
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