LT1249IS8#TR datasheet, PDF - EEWORLD Datasheet

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LT1249IS8#TR: DescriptionIC pfc ctrlr average curr 8soic; CategoryPower/power management The power supply circuit; File Size191KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LT1249IS8#TR Overview

IC pfc ctrlr average curr 8soic

LT1249IS8#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SOIC
package instruction	SOP, SOP8,.25
Contacts	8
Manufacturer packaging code	S8
Reach Compliance Code	_compli
ECCN code	EAR99
Analog Integrated Circuits - Other Types	POWER FACTOR CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	25 V
Minimum input voltage	11.5 V
JESD-30 code	R-PDSO-G8
JESD-609 code	e0
length	4.9 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	125 °C
Minimum operating temperature	-40 °C
Maximum output current	1.5 A
Nominal output voltage	7.5 V
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	235
power supply	18 V
Certification status	Not Qualified
Maximum seat height	1.75 mm
Maximum supply current (Isup)	12 mA
Nominal supply voltage (Vsup)	18 V
surface mount	YES
Switch configuration	SINGLE
Maximum switching frequency	100 kHz
technology	BIPOLAR
Temperature level	AUTOMOTIVE
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	3.9 mm

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LT1249

Power Factor Controller

FEATURES

DESCRIPTIO

Standard 8-Pin Packages

High Power Factor Over Wide Load Range

with Line Current Averaging

International Operation Without Switches

Instantaneous Overvoltage Protection

Minimal Line Current Dead Zone

Typical 250µA Start-Up Supply Current

Rejects Line Switching Noise

Synchronization Capability

Low Quiescent Current: 9mA

Fast 1.5A Peak Current Gate Driver

The 8-pin LT

1249 provides active power factor correc-

tion for universal offline power systems with very few

external parts. By using fixed high frequency PWM current

averaging without the need for slope compensation, the

LT1249 achieves far lower line current distortion, with a

smaller magnetic element than systems that use either peak

current detection or zero current switching approach, in

both continuous and discontinuous modes of operation.

The LT1249 uses a multiplier containing a square gain

function from the voltage amplifier to reduce the AC gain

at light output load and thus maintains low line current

distortion and high system stability. The LT1249 also

provides filtering capability to reject line switching noise

which can cause instability when fed into the multiplier.

Line current dead zone is minimized with low bias voltage

at the current input to the multiplier.

The LT1249 provides many protection features including

peak current limiting and overvoltage protection. The

switching frequency is internally set at 100kHz.

While the LT1249 simplifies PFC design with minimal

parts count, the LT1248 provides flexibilities in switching

frequency, overvoltage and current limit.

APPLICATIO S

Universal Power Factor Corrected Power Supplies

Preregulators up to 1500W

, LTC and LT are registered trademarks of Linear Technology Corporation.

BLOCK DIAGRA

OUT

SENSE

7.5V

OUT

MOUT

32k

MULTIPLIER

I I

A B

200µA

15µA

OUT

–

16V/10V

–

250µA MAX

–

= 1/3k

RUN

0.7V

–

SYNC

OSC

20µA

35pF

1249 BD

44µA

22µA

–

GND

7.5V

REF

RUN

GTDR

16V

LT1249IS8#TR Related Products

	LT1249IS8#TR	LT1249CS8#TR	LT1249CS8#TRPBF	LT1249IS8#TRPBF	LT1249CN8#PBF	LT1249CS8#PBF	LT1249IS8#PBF	LT1249IN8#PBF
Description	IC pfc ctrlr average curr 8soic	IC pfc ctrlr average curr 8soic	IC PFC CTRLR AVERAGE CURR 8SOIC	IC PFC CTRLR AVERAGE CURR 8SOIC	IC PFC CTRLR AVERAGE CURR 8DIP	IC PFC CTRLR AVERAGE CURR 8SOIC	IC PFC CTRLR AVERAGE CURR 8SOIC	IC PFC CTRLR AVERAGE CURR 8DIP
Brand Name	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	incompatible	incompatible	conform to	conform to	conform to	conform to	conform to	conform to
Parts packaging code	SOIC	SOIC	SOIC	SOIC	DIP	SOIC	SOIC	DIP
package instruction	SOP, SOP8,.25	SOP, SOP8,.25	SOP, SOP8,.25	SOP, SOP8,.25	DIP, DIP8,.3	SOP, SOP8,.25	SOP, SOP8,.25	DIP, DIP8,.3
Contacts	8	8	8	8	8	8	8	8
Manufacturer packaging code	S8	S8	S8	S8	N	S8	S8	N
Reach Compliance Code	_compli	_compli	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	POWER FACTOR CONTROLLER	POWER FACTOR CONTROLLER	POWER FACTOR CONTROLLER	POWER FACTOR CONTROLLER	POWER FACTOR CONTROLLER	POWER FACTOR CONTROLLER	POWER FACTOR CONTROLLER	POWER FACTOR CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	25 V	25 V	25 V	25 V	25 V	25 V	25 V	25 V
Minimum input voltage	11.5 V	11.5 V	11.5 V	11.5 V	11.5 V	11.5 V	11.5 V	11.5 V
JESD-30 code	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDIP-T8	R-PDSO-G8	R-PDSO-G8	R-PDIP-T8
JESD-609 code	e0	e0	e3	e3	e3	e3	e3	e3
Humidity sensitivity level	1	1	1	1	1	1	1	1
Number of functions	1	1	1	1	1	1	1	1
Number of terminals	8	8	8	8	8	8	8	8
Maximum operating temperature	125 °C	100 °C	100 °C	125 °C	100 °C	100 °C	125 °C	125 °C
Maximum output current	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A
Nominal output voltage	7.5 V	7.5 V	7.5 V	7.5 V	7.5 V	7.5 V	7.5 V	7.5 V
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	SOP	SOP	SOP	DIP	SOP	SOP	DIP
Encapsulate equivalent code	SOP8,.25	SOP8,.25	SOP8,.25	SOP8,.25	DIP8,.3	SOP8,.25	SOP8,.25	DIP8,.3
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	IN-LINE	SMALL OUTLINE	SMALL OUTLINE	IN-LINE
Peak Reflow Temperature (Celsius)	235	235	260	260	NOT SPECIFIED	260	260	NOT SPECIFIED
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	1.75 mm	1.75 mm	1.75 mm	3.937 mm	1.75 mm	1.75 mm	3.937 mm
Maximum supply current (Isup)	12 mA	12 mA	12 mA	12 mA	12 mA	12 mA	12 mA	12 mA
surface mount	YES	YES	YES	YES	NO	YES	YES	NO
Switch configuration	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE	SINGLE
Maximum switching frequency	100 kHz	100 kHz	100 kHz	100 kHz	100 kHz	100 kHz	100 kHz	100 kHz
technology	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR	BIPOLAR
Temperature level	AUTOMOTIVE	OTHER	OTHER	AUTOMOTIVE	OTHER	OTHER	AUTOMOTIVE	AUTOMOTIVE
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	THROUGH-HOLE	GULL WING	GULL WING	THROUGH-HOLE
Terminal pitch	1.27 mm	1.27 mm	1.27 mm	1.27 mm	2.54 mm	1.27 mm	1.27 mm	2.54 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	20	20	30	30	NOT SPECIFIED	30	30	NOT SPECIFIED
width	3.9 mm	3.9 mm	3.9 mm	3.9 mm	7.62 mm	3.9 mm	3.9 mm	7.62 mm
length	4.9 mm	4.9 mm	4.9 mm	4.9 mm	-	4.9 mm	4.9 mm	-
power supply	18 V	18 V	18 V	18 V	-	-	-	18 V
Nominal supply voltage (Vsup)	18 V	18 V	18 V	18 V	-	-	-	18 V

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