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KA3845

Description
1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
Categorysemiconductor    Analog mixed-signal IC   
File Size92KB,12 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
Download Datasheet Parametric Compare View All

KA3845 Overview

1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14

KA3845 Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals14
Rated input voltage15 V
Maximum limit input voltage30 V
Minimum limit input voltage12 V
Maximum operating temperature70 Cel
Minimum operating temperature0.0 Cel
Processing package descriptionSOP-14
Lead-freeYes
EU RoHS regulationsYes
stateACTIVE
packaging shapeRECTANGULAR
Package SizeSMALL OUTLINE
surface mountYes
Terminal formGULL WING
Terminal spacing1.27 mm
terminal coatingMATTE TIN
Terminal locationDUAL
Packaging MaterialsPLASTIC/EPOXY
Temperature levelCOMMERCIAL
control modePEAK CURRENT
Control TechnologyPULSE WIDTH MODULATION
Maximum output current1 A
Analog IC other typesSWITCHING CONTROLLER
Switch configurationSINGLE
Maximum switching frequency500 kHz
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 spe-
cially 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 Ideally suited for driving a
power MOSFET. Protection circuity Includes built in
under-voltage lockout and current limiting. 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
Rev. 5.0
©2000 Fairchild Semiconductor International

KA3845 Related Products

KA3845 KA3845BD KA3844BD KA3842
Description 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
Number of functions 1 1 1 1
Number of terminals 14 14 14 14
Maximum operating temperature 70 Cel 70 °C 70 °C 70 Cel
surface mount Yes YES YES Yes
Terminal form GULL WING GULL WING GULL WING GULL WING
Terminal location DUAL DUAL DUAL DUAL
Temperature level COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL
control mode PEAK CURRENT CURRENT-MODE CURRENT-MODE PEAK CURRENT
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum output current 1 A 1 A 1 A 1 A
Switch configuration SINGLE SINGLE SINGLE SINGLE
Maximum switching frequency 500 kHz 500 kHz 500 kHz 500 kHz
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