LT1247CS8 datasheet, PDF - EEWORLD Datasheet

LT1247CS8: DescriptionCurrent Mode PWM Controller 1A 1000kHz 8-Pin SOIC N; File Size237KB，12 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LT1247CS8 Overview

Current Mode PWM Controller 1A 1000kHz 8-Pin SOIC N

LT1247CS8 Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Not Compliant
ECCN (US)	EAR99
Part Status	Unconfirmed
HTS	8542.39.00.01
SVHC	Yes
SVHC Exceeds Threshold	Yes
Type	Current Mode PWM Controller
Control Method	Current
Number of PWM Outputs	1
Oscillator Accuracy (kHz)	500
Switching Frequency (kHz)	1000
Maximum Duty Cycle (%)	100
Output Current (mA)	1000
Rise Time (ns)	30
Fall Time (ns)	20
Operating Supply Voltage (V)	7 to 25
Minimum Operating Supply Voltage (V)	7
Maximum Operating Supply Voltage (V)	25
Maximum Supply Current (mA)	20
Maximum Power Dissipation (mW)	1000
Adjustable Output	No
On/Off Pin	No
Synchronous Pin	No
Minimum Operating Temperature (°C)	0
Maximum Operating Temperature (°C)	100
Supplier Temperature Grade	Commercial
Pin Count	8
Standard Package Name	SOP
Supplier Package	SOIC N
Mounting	Surface Mount
Package Height	1.5(Max)
Package Length	5(Max)
Package Width	3.99(Max)
PCB changed	8
Lead Shape	Gull-wing

User Manual

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LT1246/LT1247

1MHz Off-Line

Current Mode PWM

and DC/DC Converter

DESCRIPTIO

The LT

1246/LT1247 are 8-pin, fixed frequency, current

mode, pulse width modulators. These devices are de-

signed to be improved plug compatible versions of the

industry standard UC1842 PWM circuit. The LT1246/

LT1247 are optimized for off-line and DC/DC converter

applications. They contain a temperature compensated

reference, high gain error amplifier, current sensing com-

parator, and a high current totem pole output stage ideally

suited to driving power MOSFETs. Start-up current has

been reduced to less than 250µA. Cross-conduction cur-

rent spikes in the totem pole output stage have been

eliminated, making 1MHz operation practical. Several new

features have been incorporated. Leading edge blanking

has been added to the current sense comparator. This

minimizes or eliminates the filter that is normally required.

Eliminating this filter allows the current sense loop to

operate with minimum delays. Trims have been added to

the oscillator circuit for both frequency and sink current,

and both of these parameters are tightly specified. The

output stage is clamped to a maximum V

OUT

of 18V in the

on state. The output and the reference output are actively

pulled low during under-voltage lockout.

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

FEATURES

Current Mode Operation to 1MHz

30ns Current Sense Delay

< 250µA Low Start-Up Current

Current Sense Leading Edge Blanking

Pin Compatible with UC1842

Undervoltage Lockout with Hysteresis

No Cross-Conduction Current

Trimmed Bandgap Reference

1A Totem Pole Output

Trimmed Oscillator Frequency and Sink Current

Active Pull-Down on Reference and Output During

Undervoltage Lockout

18V High Level Output Clamp

APPLICATI

Off-Line Converters

DC/DC Converters

Start-Up

Threshold

16V

8.4V

Minimum

Operating

Voltage

10V

7.6V

Maximum

Duty Cycle

100%

Device

LT1246

LT1247

Replaces

UC1842

UC1843

BLOCK DIAGRA

REFERENCE ENABLE

5V REF

MAIN BIAS

REFERENCE PULLDOWN

OUTPUT

PULLDOWN

COMPENSATION

1mA

5.6V

OSCILLATOR

GND

OUTPUT

FEEDBACK

2.5V

–

BLANKING

SENSE

LOCKOUT

REF

18V

1.5V

–

LT1246 • BD01

LT1247CS8 Related Products

	LT1247CS8	LT1247CS8#PBF	LT1247CS8#TRPBF
Description	Current Mode PWM Controller 1A 1000kHz 8-Pin SOIC N	Current Mode PWM Controller 1A 1000kHz 8-Pin SOIC N Tube	Current Mode PWM Controller 1A 1000kHz 8-Pin SOIC N T/R
EU restricts the use of certain hazardous substances	Not Compliant	Compliant	Compliant
ECCN (US)	EAR99	EAR99	EAR99
Part Status	Unconfirmed	Active	Active
Type	Current Mode PWM Controller	Current Mode PWM Controller	Current Mode PWM Controller
Control Method	Current	Current	Current
Number of PWM Outputs	1	1	1
Oscillator Accuracy (kHz)	500	500	500
Switching Frequency (kHz)	1000	1000	1000
Maximum Duty Cycle (%)	100	100	100
Output Current (mA)	1000	1000	1000
Rise Time (ns)	30	30	30
Fall Time (ns)	20	20	20
Operating Supply Voltage (V)	7 to 25	7 to 25	7 to 25
Minimum Operating Supply Voltage (V)	7	7	7
Maximum Operating Supply Voltage (V)	25	25	25
Maximum Supply Current (mA)	20	20	20
Maximum Power Dissipation (mW)	1000	1000	1000
Adjustable Output	No	No	No
On/Off Pin	No	No	No
Synchronous Pin	No	No	No
Maximum Operating Temperature (°C)	100	100	100
Supplier Temperature Grade	Commercial	Commercial	Commercial
Pin Count	8	8	8
Standard Package Name	SOP	SOP	SOP
Supplier Package	SOIC N	SOIC N	SOIC N
Mounting	Surface Mount	Surface Mount	Surface Mount
Package Height	1.5(Max)	1.5(Max)	1.5(Max)
Package Length	5(Max)	5(Max)	5(Max)
Package Width	3.99(Max)	3.99(Max)	3.99(Max)
PCB changed	8	8	8
Lead Shape	Gull-wing	Gull-wing	Gull-wing
HTS	8542.39.00.01	-	8542.39.00.01
Packaging	-	Tube	Tape and Reel

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