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UC3843

Part Number	UC3843
Manufacturer	Fairchild Semiconductor
Description	SMPS Controller
Published	Feb 22, 2008
Detailed Description	www.DataSheet4U.com www.fairchildsemi.com UC3842/UC3843/UC3844/UC3845 SMPS Controller Features • • • • Low Start up Cu...
Datasheet	UC3843 PDF File

Overview

www.
DataSheet4U.
com 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) ...

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