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參數資料
| 型號： | 1698I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Isolated Secondary Synchronous Rectifier Controller |
| 中文描述： | 孤立的次級同步整流控制器 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 1047K |
| 代理商： | 1698I |
1
LTC1698
1698f
APPLICATIU
DESCRIPTIOU
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.
FEATURES
TYPICAL APPLICATIOU
Isolated Secondary
Synchronous Rectifier Controller
I
High Efficiency Over Wide Load Current Range
I
±
0.8% Output Voltage Accuracy
I
Dual N-Channel MOSFET Synchronous Drivers
I
Pulse Transformer Synchronization
I
Optocoupler Feedback Driver
I
Programmable Current Limit Protection
I
±
5% Margin Output Voltage Adjustment
I
Adjustable Overvoltage Fault Protection
I
Power Good Flag
I
Auxiliary 3.3V Logic Supply
I
Available in 16-Lead SSOP and SO Packages
I
48V Input Isolated DC/DC Converters
I
Isolated Telecommunication Power Systems
I
Distributed Power Step-Down Converters
I
Industrial Control Systems
I
Automotive and Heavy Equipment
Figure 1. Simplified 2-Transistor Isolated Forward Converter
+
+
CG
V
DD
PWRGD
LTC1698
PGND
GND
2
8
C
FB
C
C
C
CILM
R
C
V
OUT
R
CILM
R2
R5
R4
R1
L1
6
13
9
7
14
C
OUT
1
10
Q4
Q3
V
IN
36V to 72V
T1
Q1
D1
Q2
R
PRISEN
T2
FG
16
I
SNS
R
SECSEN
12
I
SNSGND
11
SYNC
V
FB
V
COMP
V
AUX
I
COMP
OVPIN
MARGIN
V
MARGIN
O.1
μ
F
1681 F01
V
3.3V
10mA
15
OPTODRV
PLEASE REFER TO FIGURE 12 IN THE TYPICAL APPLICATIONS
SECTION FOR THE COMPLETE 3.3V/15A APPLICATION SCHEMATIC
5
3
4
R
SYNC
R
K
R
E
ISOLATION
BOUNDARY
R
F
V
FB
SG
TG
BG
LT3781
V
C
C
SYNC
C
K
C
F
V
DD
BIAS
C
SG
+
–
D2
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