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LTC1698EGN

Description
Secondary Side PWM Controller 50kHz to 400kHz Automotive 16-Pin SSOP N
File Size1MB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1698EGN Overview

Secondary Side PWM Controller 50kHz to 400kHz Automotive 16-Pin SSOP N

LTC1698EGN Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
SVHCYes
SVHC Exceeds ThresholdYes
TypeSecondary Side PWM Controller
Number of PWM Outputs1
Switching Frequency (kHz)50 to 400
Rise Time (ns)10
Fall Time (ns)10
Operating Supply Voltage (V)8
Minimum Operating Supply Voltage (V)6
Typical Operating Supply Voltage (V)8
Maximum Operating Supply Voltage (V)12.6
Maximum Supply Current (mA)5(Typ)
Maximum Power Dissipation (mW)500
Adjustable OutputNo
On/Off PinYes
Synchronous PinNo
UVLO Turn-On Threshold (V)4
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
Pin Count16
Standard Package NameSOP
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length4.98(Max)
Package Width3.99(Max)
PCB changed16
Lead ShapeGull-wing
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
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