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LT3837EFE PDF预览

LT3837EFE

更新时间: 2024-02-14 11:17:59
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
28页 370K
描述
LT3837 - Isolated No-Opto Synchronous Flyback Controller; Package: TSSOP; Pins: 16; Temperature Range: -40°C to 85°C

LT3837EFE 技术参数

是否Rohs认证: 不符合生命周期:Active
包装说明:4.40 MM, PLASTIC, TSSOP-16Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.23模拟集成电路 - 其他类型:SWITCHING CONTROLLER
控制模式:CURRENT-MODE最大输入电压:20 V
最小输入电压:4.5 V标称输入电压:14 V
JESD-30 代码:R-PDSO-G16JESD-609代码:e0
长度:5 mm湿度敏感等级:1
功能数量:1端子数量:16
最高工作温度:85 °C最低工作温度:
封装主体材料:PLASTIC/EPOXY封装代码:HTSSOP
封装形状:RECTANGULAR封装形式:SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度(摄氏度):235认证状态:Not Qualified
座面最大高度:1.1 mm表面贴装:YES
切换器配置:SINGLE最大切换频率:110 kHz
温度等级:OTHER端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:0.65 mm
端子位置:DUAL处于峰值回流温度下的最长时间:20
宽度:4.4 mmBase Number Matches:1

LT3837EFE 数据手册

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LT3837  
Isolated No-Opto  
Synchronous Flyback Controller  
FEATURES  
DESCRIPTION  
®
Senses Output Voltage Directly from Primary Side  
Winding—No Optoisolator Required  
Synchronous Driver for High Efficiency  
Supply Voltage Range 4.5V to 20V  
Accurate Regulation Without User Trims  
Programmable Switching Frequency from  
50kHz to 250kHz  
The LT 3837 is an isolated switching regulator controller  
designed for medium power flyback topologies. A typical  
application is 10W to 60W with the part powered from a  
DC supply.  
The LT3837 is a current mode controller that regulates an  
output voltage based on sensing the secondary voltage  
via a transformer winding during flyback. This allows for  
tight output regulation without the use of an optoisolator,  
improving dynamic response and reliability. Synchronous  
rectification increases converter efficiency and improves  
output cross regulation in multiple output converters.  
Synchronizable  
Load Compensation  
Undervoltage Lockout  
Available in a Thermally Enhanced 16-Lead  
TSSOP Package  
The LT3837 operates in forced continuous conduction  
modewhichimprovescrossregulationinmultiplewinding  
applications. Switching frequency is user programmable  
and can be externally synchronized. The part also has  
load compensation, undervoltage lockout and soft-start  
circuitry.  
APPLICATIONS  
Isolated Medium Power (10W to 60W) Supplies  
Instrumentation Power Supplies  
Isolated Medical Supplies  
The LT3837 is available in a thermally enhanced 16-pin  
TSSOP package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 6498466, 5841643.  
Efficiency vs Load Current  
TYPICAL APPLICATION  
90  
18V  
9V  
IN  
IN  
88  
9V –18V to 3.3V at 10A Isolated Converter  
86  
84  
82  
80  
V
IN  
22.1k  
10µF  
BAS16  
100nH  
OUTPUT 3.3V/10A  
2N3906  
22µF  
47µF × 3  
220µF  
2.2nF  
10Ω  
86.6k  
15k  
78  
76  
V
CC  
FB  
UVLO  
2
5
7
8
9
10  
3
4
6
B0540W  
V
C
3837 TA01b  
LOAD CURRENT (A)  
3k  
1nF  
10Ω  
LT3837  
47pF  
20k  
3.3nF  
Regulation vs Load Current  
OSC  
SFST  
FMMT618  
1µF  
3.60  
3.50  
3.40  
3.30  
3.20  
3.10  
3.00  
Si7336ADP  
Si7852DP  
PG  
+
100k  
12k  
FMMT718  
t
ON  
150k  
SENSE  
ENDLY  
PGDLY  
8mΩ  
9V  
IN  
1.37k  
SENSE  
R
2.2nF  
0.1µF  
CMP  
330Ω  
15Ω  
0.1µF  
18V  
IN  
SG  
C
CMP  
GND  
10k  
BAT54  
3837 TA01  
2
5
7
8
9
10  
3
4
6
3837 TA01c  
LOAD CURRENT (A)  
3837f  
1

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