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LT1247CN8#PBF

Description
Switching Controllers 1MHz, DC/DC Controller
CategoryPower/power management    The power supply circuit   
File Size249KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric Compare View All

LT1247CN8#PBF Overview

Switching Controllers 1MHz, DC/DC Controller

LT1247CN8#PBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
MakerADI
package instructionDIP,
Contacts8
Manufacturer packaging code05-08-1510 (N8)
Reach Compliance Codecompliant
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage25 V
Minimum input voltage8.2 V
Nominal input voltage7.6 V
JESD-30 codeR-PDIP-T8
JESD-609 codee3
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Nominal output voltage2.5 V
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height3.937 mm
Maximum supply current (Isup)20 mA
surface mountNO
Switch configurationSINGLE
Maximum switching frequency1000 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceMATTE TIN
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width7.62 mm
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
s
s
s
s
s
s
s
s
s
s
s
s
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
s
s
S
Off-Line Converters
DC/DC Converters
Start-Up
Threshold
16V
8.4V
Minimum
Operating
Voltage
10V
7.6V
Maximum
Duty Cycle
100%
100%
Device
LT1246
LT1247
Replaces
UC1842
UC1843
BLOCK DIAGRA
REFERENCE ENABLE
5V REF
MAIN BIAS
REFERENCE PULLDOWN
OUTPUT
PULLDOWN
R
T
/C
T
COMPENSATION
4
1
1mA
5.6V
OSCILLATOR
S
R
1V
2R
R
5
GND
6
OUTPUT
FEEDBACK
2
2.5V
+
+
BLANKING
I
SENSE
3
U
W
UO
UV
LOCKOUT
8
7
V
REF
V
CC
18V
+
1.5V
LT1246 • BD01
1

LT1247CN8#PBF Related Products

LT1247CN8#PBF LT1246CN8#PBF
Description Switching Controllers 1MHz, DC/DC Controller Switching Controllers 1MHz Current Mode PWM Controller
Brand Name Analog Devices Inc Analog Devices Inc
Is it lead-free? Contains lead Contains lead
Is it Rohs certified? conform to conform to
Maker ADI ADI
package instruction DIP, DIP,
Contacts 8 8
Manufacturer packaging code 05-08-1510 (N8) 05-08-1510 (N8)
Reach Compliance Code compliant compliant
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 25 V 25 V
Minimum input voltage 8.2 V 11 V
JESD-30 code R-PDIP-T8 R-PDIP-T8
JESD-609 code e3 e3
Humidity sensitivity level 1 1
Number of functions 1 1
Number of terminals 8 8
Maximum operating temperature 70 °C 70 °C
Maximum output current 1 A 1 A
Nominal output voltage 2.5 V 2.5 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code DIP DIP
Package shape RECTANGULAR RECTANGULAR
Package form IN-LINE IN-LINE
Peak Reflow Temperature (Celsius) NOT SPECIFIED NOT SPECIFIED
Certification status Not Qualified Not Qualified
Maximum seat height 3.937 mm 3.937 mm
Maximum supply current (Isup) 20 mA 20 mA
surface mount NO NO
Switch configuration SINGLE SINGLE
Maximum switching frequency 1000 kHz 1000 kHz
technology BIPOLAR BIPOLAR
Temperature level COMMERCIAL COMMERCIAL
Terminal surface MATTE TIN MATTE TIN
Terminal form THROUGH-HOLE THROUGH-HOLE
Terminal pitch 2.54 mm 2.54 mm
Terminal location DUAL DUAL
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED
width 7.62 mm 7.62 mm
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