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參數(shù)資料
| 型號(hào)： | LR745ND |
| 廠商： | SUPERTEX INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, UUC3 |
| 封裝： | DIE-3 |
| 文件頁(yè)數(shù)： | 1/5頁(yè) |
| 文件大?。?/td> | 34K |
| 代理商： | LR745ND |
14-5
TO-243AA
(SOT-89)
Order Number / Package
TO-92
TO-243AA*
Die
450V
LR745N3
LR745N8
LR745ND
*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
GND
V
OUT
TO-92
1
2
3
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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