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LT1680

更新时间： 2024-10-02 22:51:47
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
16页 326K
描述
High Power DC/DC Step-Up Controller

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中文翻译

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LT1680 数据手册

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LT1680  
High Power DC/DC  
Step-Up Controller  
U
FEATURES  
DESCRIPTION  
The LT®1680 is a high power, current mode switching  
power supply controller optimized for boost topologies.  
The IC drives N-channel MOSFET switches for DC/DC  
converters in applications up to 60V input. A high current  
gate drive output handles up to 10,000pF gate capaci-  
tance, enabling the construction of high power DC/DC  
converters. Current sense common mode range upto60V  
allows current sensing to be referenced to the input  
supply, eliminating the need for sense blanking circuits.  
■
High Voltage: Operation Up to 60V Max  
High Current: N-Channel Drive Handles Up to  
■
10,000pF Gate Capacitance  
■
■
Programmable Average Current Limiting  
5V Reference Output with 10mA External  
Loading Capability  
■
■
■
■
Fixed Frequency Current Mode Operation  
Oscillator Synchronizable Up to 200kHz  
Undervoltage Lockout with Hysteresis  
Programmable Start Inhibit for Power Supply  
Sequencing and Protection  
The LT1680 incorporates programmable average current  
limiting allowing accurate limiting of DC current in the  
magnetics, independent of ripple current . User adjustable  
slope compensation provides stable operation at duty  
cycles up to 90%.  
■
User Adjustable Slope Compensation  
U
APPLICATIONS  
The LT1680 operating frequency is programmable and  
can be synchronized up to 200kHz. Minimum off-time  
operationprovidesswitchprotection. TheICalsoincorpo-  
rates a soft start feature that is gated by both shutdown  
and undervoltage lockout conditions.  
■
High Power Single Board Systems  
■
Distributed Power Converters  
■
Industrial Control Systems  
Lead-Acid Battery Back-Up Systems  
Automotive and Heavy Equipment  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
12V to 48V, 250W Boost  
12V  
IN  
10V TO 15V  
24A (DC)  
R
Efficiency vs Output Power  
SENSE  
C2  
0.005Ω  
1µF  
100  
V
= 48V  
C
OUT  
IN  
+
+
680µF  
25V  
R
LT1680  
SL/ADJ  
L1  
CT  
15k  
C
25µH  
CT  
95  
90  
85  
80  
75  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
×4  
1nF  
5V  
REF  
C
SYNC  
12V  
T
C12  
1µF  
C3 2.2nF  
C4 0.22µF  
I
AVG  
IN  
M1  
IRFZ44  
×3  
SS  
GATE  
1N914  
4.7k  
C
4.7nF  
V
PGND  
VC  
C
R9  
100k  
SGND RUN/SHDN  
–
R
VC  
MBR0520  
C11 1nF  
V
V
SENSE  
SENSE  
FB  
+
D1  
REF  
R7  
2k  
R6  
75k  
MBR20100CT  
C6 0.1µF  
V
×2  
OUT  
0
50  
150  
OUTPUT POWER (W)  
200  
250  
100  
48V  
C
OUT 5.2A  
+
680µF  
63V  
1680 TA02  
L1: Kool Mµ®, 18T #14 ON 77314-A7  
Kool Mµ IS A REGISTERED TRADEMARK OF MAGNETICS, INC.  
1680 TA01  
×3  
1
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LT1680ISW#PBF Linear

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