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LT3439

更新时间： 2024-11-22 22:46:55
品牌 Logo 应用领域
凌特 - Linear 变压器驱动器
页数 文件大小 规格书
12页 189K
描述
Slew Rate Controlled Ultralow Noise1A Isolated DC/DC Transformer Driver

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中文翻译

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LT3439 数据手册

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LT3439  
Slew Rate Controlled  
Ultralow Noise1A Isolated  
DC/DC Transformer Driver  
U
FEATURES  
DESCRIPTIO  
■
Reduced Conducted and Radiated EMI  
The LT®3439 is a push-pull DC/DC transformer driver that  
reduces conducted and radiated electromagnetic interfer-  
ence (EMI). Ultralow noise and EMI are achieved by  
controlling the output switch voltage and current slew  
rates. Slew rates are user adjustable to optimize output  
noise versus efficiency. The LT3439 can reduce high  
frequencyharmoniccontentbyasmuchas40dBwithonly  
a minor decrease in efficiency.  
■
Single Resistor Control of Output Switch Voltage  
and Current Slew Rates  
■
Cross Conduction Prevention Circuitry  
■
Two 1A Current Limited Power Switches  
■
Low Minimum Supply Voltage: 2.8V  
■
Low Shutdown Current: <20µA  
■
50% Duty Cycle  
■
20kHz to 250kHz Oscillator Frequency  
TheLT3439includestwo1Acurrentlimitedpowerswitches  
to ensure start-up under heavy loads. It also includes an  
oscillator that can be synchronized to an external clock for  
more accurate placement of switcher harmonics. Protec-  
tion features include current limiting, undervoltage lock-  
out, thermal shutdown and cross conduction prevention  
circuitry.  
■
Synchronizable to 300kHz  
■
Overcurrent and Overtemperature Protected  
U
APPLICATIO S  
■
Low Noise Isolated Supplies  
■
Radio and Telecom Supplies  
The LT3439 is available in a thermally enhanced 16-pin  
TSSOP with an exposed backside.  
■
Distributed Supplies  
■
Medical Instruments  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Precision Instruments  
■
Low Noise Filament Supplies  
U
TYPICAL APPLICATIO  
Low Noise 5V to 5V Push-Pull DC/DC Transformer  
5V Output Noise  
OPTIONAL  
D1  
L1 33µH  
V
IN  
5V  
V
A
B
T1  
OUT  
5V  
C
IN  
13  
C1  
47µF  
6.3V  
C2  
47µF  
6.3V  
•
•
•
•
500mA  
22µF  
V
10V  
IN  
B
3
11  
200µV/DIV  
SHDN  
SYNC  
COL A  
COL B  
LT3439  
14  
4
5
6
C
T
D2  
C
: MURATA GRM235Y5V226Z10  
C1, C2: TDK C4532X5R0J476M  
D1, D2: MBR0520  
L1: TDK SLF6028T-330MR69  
T1: COILTRONICS 15835  
IN  
680pF  
7
R
R
SL  
T
A
16.9k  
GND  
10  
PGND  
1, 16  
20mV/DIV  
34k  
3439 TA01  
5µs/DIV  
3439 TA01b  
sn3439 3439fs  
1
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中文翻译

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