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參數(shù)資料
| 型號： | LR745 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | High Input Voltage SMPS Start-up Circuit(最大輸入電壓450V，開關(guān)模式電源（SMPS）啟動電路) |
| 中文描述： | 高輸入電壓開關(guān)電源啟動電路（最大輸入電壓450V，開關(guān)模式電源（SMPS）的啟動電路） |
| 文件頁數(shù)： | 1/5頁 |
| 文件大小： | 29K |
| 代理商： | LR745 |
14
14-5
TO-243AA
(SOT-89)
Order Number / Package
TO-92
TO-243AA*
450V
LR745N3
LR745N8
*Same as SOT-89. Product supplied on 2000 piece carrier tape reels.
LR745
Ordering Information
High Input Voltage
SMPS Start-up Circuit
Maximum Input
Voltage
V
IN
1
GND
V
OUT
3
TO-92
2
TO-243AA
1
2, TAB
3
Pin Configuration
1 2 3
TO-92
1
3
2
Absolute Maximum Ratings
Input Voltage
450V
Output Voltage
25V
Operating and Storage Temperature
–55
°
C to 150
°
C
Soldering Temperature*
300
°
C
*Distance of 1.6mm from case for 10 seconds
Preliminary
TAB
Features
25V to 450V operating input voltage range
Compatible with industry standard PWM ICs.
See application notes AN-H28 and AN-H29.
Output current limiting
For PWM ICs with start-up threshold voltage
of 13.9V to 18.8V
Very low power consumption after start-up
Applications
Notebook and Laptop computers
Telecommunication power supplies
Battery chargers
Motor controller
General Description
The Supertex LR7 is a high input voltage SMPS start-up circuit.
The LR7 is ideally suited for use with industry standard low
voltage PWM ICs having start thresholds of 13.9V to 18.8V. It
allows the PWM ICs to be operated from rectified 120V or
240VAC lines, and eliminates the use of power resistors often
used for this purpose. The internal circuitry of the LR7 allows the
PWM ICs to operate at a V
CC
voltage below their start threshold
voltage after start-up. The auxiliary voltage can be less than the
start threshold voltage, which allows for improved efficiency.
Current from the high voltage line is drawn only during the start-
up period. After start-up, the internal high voltage line is discon-
nected from the IC thereby reducing the continuous power
dissipation to a minimum.
For detailed circuit and application information, please refer
to application notes AN-H28 and AN-H29.
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|---|---|
| LR745N3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Pwr Sup Start-Up IC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LR745N3-G | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Pwr Sup Start-Up IC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LR745N3-G P002 | 制造商:Supertex Inc 功能描述:Linear Regulator IC |
| LR745N3-G P003 | 制造商:Supertex Inc 功能描述:Linear Regulator IC |
| LR745N3-G P005 | 制造商:Supertex Inc 功能描述:Linear Regulator IC |
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