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LTC3810

更新时间： 2023-12-20 18:44:52
品牌 Logo 应用领域
亚德诺 - ADI 开关控制器
页数 文件大小 规格书
38页 479K
描述
100V 电流模式同步开关稳压控制器

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中文翻译

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LTC3810 数据手册

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LTC3810  
100V Current Mode  
Synchronous Switching  
Regulator Controller  
FEATURES  
DESCRIPTION  
n
The LTC3810 is a synchronous step-down switching  
regulator controller that can directly step-down voltages  
from up to 100V, making it ideal for telecom and automo-  
tive applications. The LTC3810 uses a constant on-time  
valley current control architecture to deliver very low duty  
cycles with accurate cycle-by-cycle current limit, without  
requiring a sense resistor.  
High Voltage Operation: Up to 100V  
n
Large 1Ω Gate Drivers  
n
No Current Sense Resistor Required  
Dual N-Channel MOSFET Synchronous Drive  
n
n
Extremely Fast Transient Response  
0.5% 0.8V Voltage Reference  
n
n
Programmable Output Voltage Tracking/Soft-Start  
n
Generates 10V Driver Supply from Input Supply  
A precise internal reference provides 0.5% DC accuracy. A  
highbandwidth(25MHz)erroramplifierprovidesveryfast  
line and load transient response. Large 1Ω gate drivers  
allow the LTC3810 to drive multiple MOSFETs for higher  
current applications. The operating frequency is selected  
by an external resistor and is compensated for variations  
n
Synchronizable to External Clock  
n
Selectable Pulse Skip Mode Operation  
n
Power Good Output Voltage Monitor  
n
Adjustable On-Time/Frequency: t  
< 100ns  
ON(MIN)  
n
n
n
n
Adjustable Cycle-by-Cycle Current Limit  
Programmable Undervoltage Lockout  
Output Overvoltage Protection  
28-Pin SSOP Package  
in V and can also be synchronized to an external clock  
IN  
forswitching-noisesensitiveapplications.Ashutdownpin  
allows the LTC3810 to be turned off, reducing the supply  
current to 240μA.  
APPLICATIONS  
Integratedbiascontrolgeneratesgatedrivepowerfromthe  
input supply during start-up and when an output short-  
circuit occurs, with the addition of a small external SOT23  
MOSFET. When in regulation, power is derived from the  
output for higher efficiency.  
n
48V Telecom and Base Station Power Supplies  
Networking Equipment, Servers  
Automotive and Industrial Control Systems  
n
n
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
and No R is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners. Protected by U.S. Patents including 5481178, 5847554,  
6304066, 6476589, 6580258, 6677210, 6774611.  
TYPICAL APPLICATION  
High Efficiency High Voltage Step-Down Converter  
Efficiency vs Load Current  
V
IN  
15V TO 100V  
100  
R
ON  
261k  
+
V
= 50V  
C
IN  
IN  
100k  
22μF  
V
= 25V  
IN  
I
ON  
M3  
95  
90  
85  
NDRV  
ZXMN10A07F  
V
= 75V  
IN  
PGOOD  
BOOST  
LTC3810  
V
RNG  
M1  
Si7456DP  
L1  
10μH  
TG  
0.1μF  
C
SS  
V
MODE/SYNC  
SS/TRACK  
SHDN  
OUT  
SW  
1000pF  
12V/6A  
EXTV  
DRV  
INTV  
CC  
CC  
R
FB1  
14k  
+
CC  
+
D1  
80  
SENSE  
C
OUT  
MBR1100  
I
0
1
2
3
4
5
6
TH  
47pF  
5pF  
M2  
Si7456DP  
270μF  
LOAD (A)  
200k  
BG  
V
FB  
3810 TA01b  
–
SENSE  
BGRTN  
R
FB2  
1k  
SGND  
1μF  
3810 TA01  
3810fc  
1
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