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KA3843BDTF

Description
Switching Controllers SMPS Controller
CategoryPower/power management    The power supply circuit   
File Size119KB,10 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
Environmental Compliance
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Switching Controllers SMPS Controller

KA3843BDTF Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
MakerFairchild
Parts packaging codeSOIC
package instructionSOP, SOP14,.25
Contacts14
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage12 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G14
JESD-609 codee3
length8.56 mm
Humidity sensitivity level1
Number of functions1
Number of terminals14
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP14,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.8 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.95 mm
Base Number Matches1
www.fairchildsemi.com
KA3842B/KA3843B/KA3844B/
KA3845B
SMPS Controller
Features
Low Start up Current
Maximum Duty Clamp
UVLO With Hysteresis
Operating Frequency up to 500KHz
Description
The KA3842B/KA3843B/KA3844B/KA3845B are fixed
frequency current-mode PWM controller. They are
specially designed for Off - Line and DC-to-DC converter
applications with minimum external components. These
integrated circuits feature a trimmed oscillator for precise
duty cycle control, a temperature compensated reference,
high gain error amplifier, current sensing comparator and a
high current totempole output for driving a power MOSFET.
The KA3842B and KA3844B have UVLO thresholds of
16V (on) and 10V (off). The KA3843B and KA3845B are
8.5V (on) and 7.9V (off). The KA3842B and KA3843B can
operate within 100% duty cycle. The KA3844B and
KA3845B can operate with 50% duty cycle.
8-DIP
1
14-SOP
1
Internal Block Diagram
Rev. 1.0.2
©2002 Fairchild Semiconductor Corporation
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