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KA3843B

Fairchild
Part Number KA3843B
Manufacturer Fairchild
Description SMPS Controller
Published Apr 25, 2005
Detailed Description www.fairchildsemi.com KA3842B/KA3843B/KA3844B/ KA3845B SMPS Controller Features • Low Start up Current • Maximum Duty C...
Datasheet PDF File KA3843B PDF File

KA3843B
KA3843B

Overview
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...


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