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LR745N3-P014

Description
Switching Converters, Regulators and Controllers pwr sup start-Up IC
Categorysemiconductor    Power management   
File Size539KB,7 Pages
ManufacturerSupertex
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LR745N3-P014 Overview

Switching Converters, Regulators and Controllers pwr sup start-Up IC

LR745N3-P014 Parametric

Parameter NameAttribute value
MakerSupertex
Product CategorySwitching Converters, Regulators and Controllers
RoHSno
The output voltage25 V
range of working temperature- 55 C to + 150 C
Installation styleThrough Hole
Package/boxTO-92
LR745
High Input Voltage SMPS Start-up
Features
Accepts inputs from 35V to 450V
Output current limiting
For PWM ICs with start-up threshold voltage of
13.9 - 18.0V
Very low power consumption after start-up
General Description
The Supertex LR745 is a high input voltage SMPS start-
up circuit. The LR745 is ideally suited for use with industry
standard low voltage PWM ICs having start thresholds of 13.9
- 18.0V. It allows the PWM ICs to be operated from rectified
120 or 240VAC lines, and eliminates the use of power resistors
often used for this purpose.
The internal circuitry of the LR745 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
disconnected from the IC, thereby reducing the continuous
power dissipation to a minimum.
Applications
Notebook and laptop computers
Telecommunication power supplies
Battery chargers
Motor controllers
Ordering Information
Device
LR745
Package Options
TO-92
LR745N3-G
TO-243AA (SOT-89)
LR745N8-G
Pin Configurations
GND
VOUT
GND
VIN
VOUT
VIN
GND
-G indicates package is RoHS compliant (‘Green’)
TO-92 (N3)
TO-243AA (SOT-89) (N8)
Package Markings
Absolute Maximum Ratings
Parameter
Input voltage
Output voltage
Operating and storage temperature
Soldering temperature*
Value
450V
25V
-55°C to +150 C
O
Si
L R
7 4 5
YWLL
Y = Last Digit of Year Sealed
W = Code for Week Sealed
L = Lot Number
= “Green” Packaging
TO-92 (N3)
Package may or may not include the following marks: Si or
300
O
C
Absolute Maximum Ratings are those values beyond which damage to the device
may occur. Functional operation under these conditions is not implied. Continuous
operation of the device at the absolute rating level may affect device reliability. All
voltages are referenced to device ground.
* Distance of 1.6mm from case for 10 seconds.
LR7W
W = Code for Week Sealed
= “Green” Packaging
TO-243AA (SOT-89) (N8)
Package may or may not include the following marks: Si or
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com

LR745N3-P014 Related Products

LR745N3-P014 LR745N3 LR745N3-P003 LR745N3-P013 LR745N3-P003-G LR745N8 LR745N3-P013-G LR745N3-P002-G LR745N3-P014-G
Description Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC Switching Converters, Regulators and Controllers pwr sup start-Up IC
Maker Supertex Supertex Supertex Supertex Supertex Supertex Supertex Supertex Supertex
Product Category Switching Converters, Regulators and Controllers - Switching Converters, Regulators and Controllers Switching Converters, Regulators and Controllers Switching Converters, Regulators and Controllers - Switching Converters, Regulators and Controllers Switching Converters, Regulators and Controllers Switching Converters, Regulators and Controllers
RoHS no - no no yes - yes yes yes
The output voltage 25 V - 25 V 25 V 25 V - 25 V 25 V 25 V
Installation style Through Hole - Through Hole Through Hole Through Hole - Through Hole Through Hole Through Hole
Package/box TO-92 - TO-92 TO-92 TO-92 - TO-92 TO-92 TO-92
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