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UC3843D1 Datasheet

  • UC3843D1

  • SMPS Controller

  • 12頁

  • FAIRCHILD

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上傳產(chǎn)品規(guī)格書

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www.fairchildsemi.com
UC3842/UC3843/UC3844/UC3845
SMPS Controller
Features
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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
漏2002 Fairchild Semiconductor Corporation

UC3843D1 產(chǎn)品屬性

  • Fairchild Semiconductor

  • 500 KHz

  • 100 %

  • 45 ns

  • 35 ns

  • 1

  • + 70 C

  • SMD/SMT

  • SOP-8

  • 0 C

  • 1000 mA

  • Tube

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