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LTC1698ES Datasheet

  • LTC1698ES

  • Isolated Secondary Synchronous Rectifier Controller

  • 24頁

  • LINER

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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
鹵0.8%
Output Voltage Accuracy
Dual N-Channel MOSFET Synchronous Drivers
Pulse Transformer Synchronization
Optocoupler Feedback Driver
Programmable Current Limit Protection
鹵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
廬
1698 is a precision secondary-side forward
converter controller that synchronously drives external
N-channel MOSFETs. It is designed for use with the
LT
廬
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
鹵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
鹵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
鈥?/div>
PWRGD
8
V
FB
C
FB
V
COMP
6
LTC1698
I
SNSGND
SYNC
I
COMP
OVPIN
13
9
R
CILM
鈥?/div>
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.1碌F
1681 F01
V
C
R
F
+
鈥?/div>
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
鈥?/div>
鈥?/div>
1

LTC1698ES 產(chǎn)品屬性

  • LTC1698

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 400kHz

  • -

  • 6 V ~ 12.6 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 是

  • -40°C ~ 85°C

  • 16-SOIC（0.154"，3.90mm 寬）

  • 管件

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