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File name:UC3842.pdf
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MOTOROLA

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Original Chassis:UC3842AN-MBR
Descr:PWM I-CNTRL 5V 2% 52KHZ DIP08
Group:Electronics > Components > Integrated circuits >
Uploaded:2004-03-09 16:09:21
User:plamensl
Multipart:No multipart

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UC3842.pdfPhilips Semiconductors Linear Products Product specification Current-mode PWM controller UC3842 DESCRIPTION The UC3842 is available in an 8-Pin mini-DIP the necessary features to implement off-line, fixed-frequency current-mode control schemes with a minimal external parts count. This technique results in improved line regulation, enhanced load response characteristics, and a simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting. Protection circuitry includes built-in undervoltage lock-out and current limiting. Other features include fully-latched operation, a 1% trimmed bandgap reference, and start-up current less than 1mA. These devices feature a totem-pole output designed to source and sink high peak current from a capacitive load, such as the gate of a power MOSFET. Consistent with N-channel power devices, the output is low in the OFF-state. PIN CONFIGURATIONS N Package COMP VFB ISENSE RT/CT 1 2 3 4 TOP VIEW 8 7 6 5 VRE





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