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UC3844

Description
1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8
Categorysemiconductor    Analog mixed-signal IC   
File Size128KB,12 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
Download Datasheet Parametric View All

UC3844 Overview

1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8

UC3844 Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals8
Rated input voltage15 V
Maximum limit input voltage25 V
Minimum limit input voltage15 V
Maximum operating temperature70 Cel
Minimum operating temperature0.0 Cel
Processing package description0.300 INCH, MINI, DIP-8
stateDISCONTINUED
CraftsmanshipBIPOLAR
packaging shapeRectangle
Package SizeIN-line
Terminal formTHROUGH-hole
Terminal spacing2.54 mm
terminal coatingtin lead
Terminal locationpair
Packaging MaterialsPlastic/Epoxy
Temperature levelCOMMERCIAL
control modePEAK current
Control TechnologyPulse width MODULATION
Maximum output current1 A
Analog IC other typesswitch controller
Rated regulated voltage2.5 V
Switch configurationsingle
Maximum switching frequency500 kHz
www.fairchildsemi.com
UC3842/UC3843/UC3844/UC3845
SMPS Controller
Features
Low Start up Current
Maximum Duty Clamp
UVLO With Hysteresis
Operating Frequency up to 500KHz
Description
The UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-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
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100% duty cycle. The UC3844 and UC3845 can operate
with 50% duty cycle.
8-DIP
8-SOP
1
1
14-SOP
1
Internal Block Diagram
* NORMALLY 8DIP/8SOP PIN NO.
* ( ) IS 14SOP PINNO.
* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845
Rev. 1.0.1
©2002 Fairchild Semiconductor Corporation
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