Datasheet > LR745

LR745

更新时间： 2024-10-28 22:31:03

品牌	Logo	应用领域
超科 - SUPERTEX		开关
页数	文件大小	规格书
5页	330K
描述
High Input Voltage SMPS Start-up Circuit

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LR745 数据手册

LR745

High Input Voltage

SMPS Start-up Circuit

Ordering Information

Product marking for TO-243AA:

Order Number / Package

Maximum Input

Voltage

LR7❋

TO-92

TO-243AA*

where ❋ = 2-week alpha date code

450V

LR745N3

LR745N8

*Same as SOT-89. Product supplied on 2000 piece carrier tape reels.

Features

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_CCvoltage 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.

❏

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

Pin Configuration

Motor controller

Absolute Maximum Ratings

Input Voltage

TAB

450V

25V

Output Voltage

Operating and Storage Temperature

Soldering Temperature*

–55°C to 150°C

300°C

TO-243AA

(SOT-89)

1 2 3

TO-92

*Distance of 1.6mm from case for 10 seconds

V_IN

GND

V_OUT

TO-92

TO-243AA

2, TAB

For detailed circuit and application information, please refer

to application notes AN-H28 and AN-H29.

11/12/01

Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability

indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to

workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the

Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.

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与LR745相关器件

型号	品牌	获取价格	描述	数据表
LR745N3	SUPERTEX	获取价格	High Input Voltage SMPS Start-up Circuit
LR745N3-G	MICROCHIP	获取价格	SPECIALTY ANALOG CIRCUIT, BCY3
LR745N3-GP003	MICROCHIP	获取价格	SPECIALTY ANALOG CIRCUIT
LR745N3-G-P003	MICROCHIP	获取价格	High-Input Voltage SMPS Start-up
LR745N3-GP013	SUPERTEX	获取价格	Analog Circuit
LR745N3-G-P013	MICROCHIP	获取价格	High-Input Voltage SMPS Start-up
LR745N8	SUPERTEX	获取价格	High Input Voltage SMPS Start-up Circuit
LR745N8-G	MICROCHIP	获取价格	High-Input Voltage SMPS Start-up
LR745N8-G	SUPERTEX	获取价格	Analog Circuit, 1 Func, PSSO3, GREEN, TO-243AA, SOT-89, 3 PIN
LR745N8-G-P003	MICROCHIP	获取价格	High-Input Voltage SMPS Start-up

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