LR745N8

更新时间： 2024-10-28 22:31:03

品牌	Logo	应用领域
超科 - SUPERTEX		模拟IC 开关信号电路输入元件
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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技术参数
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LR745N8 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	SOT-89	包装说明：	, TO-243
针数：	3	Reach Compliance Code：	compliant
HTS代码：	8542.39.00.01	风险等级：	5.08
Is Samacsys：	N	其他特性：	OPERATING INPUT VOLTAGE RANGE: 25V TO 450V
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	R-PSSO-F3
JESD-609代码：	e0	长度：	4.4958 mm
功能数量：	1	端子数量：	3
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装等效代码：	TO-243
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	NOT SPECIFIED	电源：	25/450 V
认证状态：	Not Qualified	座面最大高度：	1.6 mm
子类别：	Switching Regulator or Controllers	最大供电电压 (Vsup)：	450 V
最小供电电压 (Vsup)：	25 V	标称供电电压 (Vsup)：	400 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	FLAT
端子节距：	1.5 mm	端子位置：	SINGLE
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	2.4384 mm
Base Number Matches：	1

LR745N8 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.

12 3 4 5

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LR745N8 替代型号

型号	品牌	替代类型	描述	数据表
LR745N8-G	MICROCHIP	功能相似	High-Input Voltage SMPS Start-up
LR745N8-G	SUPERTEX	功能相似	Analog Circuit, 1 Func, PSSO3, GREEN, TO-243AA, SOT-89, 3 PIN

与LR745N8相关器件

型号	品牌	获取价格	描述	数据表
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
LR745N8-G-P013	MICROCHIP	获取价格	High-Input Voltage SMPS Start-up
LR745ND	ETC	获取价格	Analog IC
LR750Z	SEOUL	获取价格	GREEN OVAL LAMP LED
LR751	SEOUL	获取价格	INFRARED LAMP LED
LR7530	LRC	获取价格	100mA CMOS Low Power LDO Low power consumption
LR7530-1	LRC	获取价格	100mA CMOS Low Power LDO Low power consumption
LR7533-1	LRC	获取价格	100mA CMOS Low Power LDO Low power consumption

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