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LT3844

更新时间： 2024-09-24 14:57:35
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
26页 284K
描述
具可设置工作频率的高电压、电流模式开关稳压控制器

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中文翻译

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LT3844 数据手册

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LT3844  
High Voltage, Current Mode  
Switching Regulator Controller with  
Programmable Operating Frequency  
FeaTures  
DescripTion  
TheLT®3844isaDC/DCcontrollerusedformediumpower,  
n
High Voltage Operation: Up to 60V  
n
Output Voltages Up to 36V (Step Down)  
Programmable Constant Frequency: 100kHz to  
500kHz  
low part count, high efficiency supplies. It offers a wide  
4V to 60V input range (7.5V minimum start-up voltage)  
and can implement step-down, step-up, inverting and  
SEPIC topologies.  
n
n
n
n
n
n
n
n
n
n
n
n
Synchronizable up to 600kHz  
Burst Mode® Operation: 120µA Supply Current  
10µA Shutdown Supply Current  
1.3ꢀ ꢁeference Accuracy  
Drives N-Channel MOSFET  
Programmable Soft-Start  
Programmable Undervoltage Lockout  
Internal High Voltage ꢁegulator for Gate Drive  
Thermal Shutdown  
Current Limit Unaffected by Duty Cycle  
16-Pin Thermally Enhanced TSSOP Package  
TheLT3844includesBurstModeoperation,whichreduces  
quiescent current below 120µA and maintains high effi-  
ciencyatlightloads.Aninternalhighvoltagebiasregulator  
allows for simple biasing.  
Additional features include current mode control for fast  
line and load transient response; programmable fixed  
operating frequency that can be synchronized to an ex-  
ternal clock for noise sensitive applications; a gate driver  
capable of driving large N-channel MOSFETs; a precision  
undervoltage lockout function; 10µA shutdown current;  
short-circuit protection and a programmable soft-start  
function.  
applicaTions  
n
Industrial Power Distribution  
The LT3844 is available in a 16-lead thermally enhanced  
TSSOP package.  
n
12V and 42V Automotive and Heavy Equipment  
n
High Voltage Single Board Systems  
Distributed Power Systems  
Avionics  
Telecom Power  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
n
Protected by U.S. Patents, including 5731694, 6498466, 6611131  
n
Typical applicaTion  
High Voltage Step-Down Regulator 48V to 12V, 50W  
Efficiency and Power Loss  
vs Load Current  
V
IN  
36V TO 60V  
68µF  
22µF  
90  
88  
86  
84  
82  
80  
78  
76  
7
6
5
4
3
2
1
0
0.22µF  
V
= 48V  
IN  
1M  
V
BOOST  
TG  
IN  
SHDN  
Si7850DP  
10µH  
1000pF  
EFFICIENCY  
10Ω  
82.5k  
C
SW  
SS  
BURST_EN  
V
CC  
V
0.015Ω  
OUT  
1µF  
LT3844  
12V  
LOSS  
V
V
PGND  
50W  
FB  
C
68µF  
PDS5100H  
10k  
680p  
14.7k  
33µF  
+
SENSE  
120pF  
–
SYNC  
SENSE  
130k  
0.1  
10  
1
f
SGND  
SET  
LOAD CURRENT (A)  
R7  
49.9k  
3844 TA01b  
3844 TA01  
3844fc  
1
For more information www.linear.com/LT3844  
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