LR645

更新时间： 2024-10-28 22:31:03

品牌	Logo	应用领域
超科 - SUPERTEX		稳压器开关
页数	文件大小	规格书
4页	324K
描述
High Input Voltage SMPS Start-up / Linear Regulator

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LR645 数据手册

LR645

High Input Voltage

SMPS Start-up / Linear Regulator

Ordering Information

Product marking for TO-243AA:

LR6❋

where ❋ = 2-week alpha date code

Order Number / Package

TO-243AA* TO-220 SO-8

LR645N3 LR645N8 LR645N5 LR645LG LR645ND

Max. Input Voltage

TO-92

Die

450V

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

Features

General Description

❏

Accepts inputs from 15V to 450V

The Supertex LR6 is a high input voltage, low output current

linear regulator. It has a 3-terminal fixed output voltage version

available in TO-92, TO-220 and SOT-89 packages as well as an

adjustable voltage version available in 8 pin SOIC package.The

3-terminal version functions like any other low voltage 3-terminal

regulator except it allows the use of much higher input voltages.

When used in a SMPS start-up circuit, it eliminates the need for

large power resistors. In this application, current is drawn from

the high voltage line only during start-up. Only leakage current

flows after start-up thereby reducing the continuous power

dissipation to a few milliwatts.

Compatible with industry standard PWM ICs.

See application note AN-H28.

❏

Output currents up to 3mA continuous, 30mA peak

Supply current typically 50µA

Line regulation typically 0.1mV/V

Output can be trimmed from 8.0V to 12V

Output current can be increased to 150mA with external FET

The adjustable voltage version allows trimming of the output

voltage from 8V to 12V.This version can also be connected to an

external depletion mode MOSFET for increased output current.

WhenusedinconjunctionwithSupertexdepletionmodeMOSFET

DN2540N5, up to a 150mA is achieved.

Applications

❏

Off-line SMPS startup circuits (pulse loads)

Low power off-line regulators

Regulators for noisy inputs

(continued on page 14-3)

Pin Configuration

Caution

The LR6 does NOT provide galvanic isolation. When

operated from an AC line, potentially lethal voltages can be

present on the IC. Adequate means of protecting the end

user from such voltages must be provided by the circuit

developer.

TAB

TO-243AA

(SOT-89)

1 2 3

TO-92

Absolute Maximum Ratings

Input Voltage

450V

Output Voltage

15.5V

SO-8

TO-220

Operating and Storage Temperature

–55°C to +150°C

300°C

+V_IN

GND

V_OUT

Trim

—

Gate

—

Soldering Temperature*

*Distance of 1.6mm from case for 10 seconds

TO-92

TO-243AA

TO-220

P-DIP

2, TAB

—

For detailed circuit and application information, please refer

to application note AN-H28.

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

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与LR645相关器件

型号	品牌	获取价格	描述	数据表
LR645_07	SUPERTEX	获取价格	High Input Voltage SMPS Start-up / Linear Regulator
LR645LG	SUPERTEX	获取价格	High Input Voltage SMPS Start-up / Linear Regulator
LR645LG-G	MICROCHIP	获取价格	8 V-12V ADJUSTABLE POSITIVE REGULATOR, PDSO8
LR645LG-G	SUPERTEX	获取价格	High Input Voltage SMPS Start-up / Linear Regulator
LR645LGP030	SUPERTEX	获取价格	Adjustable Positive Standard Regulator, 9.3V Min, 10.7V Max, PDSO8, SOP-8
LR645LGP031	SUPERTEX	获取价格	Adjustable Positive Standard Regulator, 9.3V Min, 10.7V Max, PDSO8, SOP-8
LR645N3	SUPERTEX	获取价格	High Input Voltage SMPS Start-up / Linear Regulator
LR645N3-G	SUPERTEX	获取价格	High Input Voltage SMPS Start-up / Linear Regulator
LR645N3-GP013	SUPERTEX	获取价格	Fixed Positive Standard Regulator, 10V, GREEN, TO-92, 3 PIN
LR645N3-GP013	MICROCHIP	获取价格	FIXED POSITIVE REGULATOR

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