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LT1738EG

更新时间： 2024-11-19 22:51:47
品牌 Logo 应用领域
凌特 - Linear 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
20页 249K
描述
Slew Rate Controlled Ultralow Noise DC/DC Controller

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中文翻译

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LT1738EG 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：SSOP包装说明：SSOP, SSOP20,.3
针数：20Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.14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：2.55 V标称输入电压：12 V
JESD-30 代码：R-PDSO-G20JESD-609代码：e0
长度：7.2 mm湿度敏感等级：1
功能数量：1端子数量：20
最高工作温度：70 °C最低工作温度：
最大输出电流：0.3 A封装主体材料：PLASTIC/EPOXY
封装代码：SSOP封装等效代码：SSOP20,.3
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：235认证状态：Not Qualified
座面最大高度：2 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：SINGLE
最大切换频率：250 kHz温度等级：COMMERCIAL
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：5.3 mm
Base Number Matches：1

LT1738EG 数据手册

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LT1738  
Slew Rate Controlled  
Ultralow Noise DC/DC Controller  
U
DESCRIPTIO  
FEATURES  
The LT®1738 is a switching regulator controller designed  
to lower conducted and radiated electromagnetic interfer-  
ence (EMI). Ultralow noise and EMI are achieved by  
controlling the voltage and current slew rates of an exter-  
nal N-channel MOSFET switch. Current and voltage slew  
rates can be independently set to optimize harmonic  
content of the switching waveforms vs efficiency. The  
LT1738 can reduce high frequency harmonic power by as  
much as 40dB with only minor losses in efficiency.  
■
Greatly Reduced Conducted and Radiated EMI  
■
■
Low Switching Harmonic Content  
Independent Control of Output Switch Voltage and  
Current Slew Rates  
■
■
■
■
■
■
Greatly Reduced Need for External Filters  
Single N-Channel MOSFET Driver  
20kHz to 250kHz Oscillator Frequency  
Easily Synchronized to External Clock  
Regulates Positive and Negative Voltages  
Easier Layout Than with Conventional Switchers  
The LT1738 utilizes a current mode architecture opti-  
mized for single switch topologies such as boost, flyback  
and Cuk. The IC includes gate drive and all necessary  
oscillator, control and protection circuitry. Unique error  
amp circuitry can regulate both positive and negative  
voltages. The internal oscillator may be synchronized to  
an external clock for more accurate placement of switch-  
ing harmonics.  
U
APPLICATIO S  
■
Power Supplies for Noise Sensitive Communication  
Equipment  
■
EMI Compliant Offline Power Supplies  
■
Precision Instrumentation Systems  
■
Isolated Supplies for Industrial Automation  
Protection features include gate drive lockout for low VIN,  
soft-start, output current limit, short-circuit current limit-  
ing, gate drive overvoltage clamp and input supply  
undervoltage lockout.  
■
Medical Instruments  
Data Acquisition Systems  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Ultralow Noise 5V to 12V Converter  
12V Output Noise  
(Bandwidth = 100MHz)  
MBRD620  
22µH  
10µH  
B
A
5V  
12V  
1A  
V
IN  
+
+
150µF  
OSCON  
4 × 150µF  
OSCON  
P3  
+
OPTIONAL  
100µF  
17  
3
V
IN  
GCL  
5pF  
POINT  
A
14  
2
1
4
400µV  
P-P  
SHDN  
V5  
CAP  
ON SCHEMATIC  
5
6
500µV/DIV  
SYNC  
1.3nF  
7
8
Si9426  
C
T
GATE  
CS  
POINT  
B
LT1738  
16.9k  
ON SCHEMATIC  
50mV/DIV  
R
R
R
V
T
25k 3.3k  
16  
15  
12  
VSL  
CSL  
25mΩ  
25k 3.3k  
22nF  
20  
9
PGND  
FB  
21.5k  
2.5k  
C
1738 TA01a  
5µs/DIV  
0.22µF  
SS GND NFB  
1.5k  
13 11 10  
1738 TA01  
10nF  
1738fa  
1
1234567...20

中文翻译

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