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UC2844A датащи(PDF) 1 Page - Microsemi Corporation |
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UC2844A датащи(HTML) 1 Page - Microsemi Corporation |
1 / 8 page DESCRIPTION KEY FEA TURES s s s s s LOW START-UP CURRENT. (0.5mA max.) s s s s s TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) p OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. p AUTOMATIC FEED FORWARD COMPENSATION. p PULSE-BY-PULSE CURRENT LIMITING. p ENHANCED LOAD RESPONSE CHARACTERISTICS. p UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. p DOUBLE PULSE SUPPRESSION. p HIGH-CURRENT TOTEM POLE OUTPUT. p INTERNALLY TRIMMED BANDGAP REFERENCE. p 500KHz OPERATION. p LOW R O ERROR AMPLIFIER. The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external compo- nents. The current mode architecture demonstrates improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET's, and an externally program- mable oscillator to set frequency and maximum duty cycle. The under- voltage lock-out is designed to operate with 250µA typ. start-up current, allowing an efficient bootstrap supply voltage design. Available options for this family of products, such as start-up voltage hysteresis and duty cycle, are summarized below in the Available Options section. The UC184xA family of control ICs is also available in 14-pin SOIC package which makes the Power Output Stage Collector and Ground pins available. APPLICA TIONS s s s s s ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. s DC-DC BUCK OR BOOST CONVERTERS. s LOW COST DC MOTOR CONTROL. A V AILABLE O PTIONS Part # Start-Up Hysteresis Max. Duty Voltage Cycle P ACKAGE ORDER INFORMA TION T A (°C) Plastic DIP 8-pin 0 to 70 UC384xAM UC384xADM UC384xAD — -40 to 85 UC284xAM UC284xADM UC284xAD UC284xAY -55 to 125 — — — UC184xAY M Plastic SOIC 8-pin DM Plastic SOIC 14-pin D Ceramic DIP 8-pin Y Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT) UCx842A 16V 6V <100% UCx843A 8.4V 0.8V <100% UCx844A 16V 6V <50% UCx845A 8.4V 0.8V <50% PRODUCT HIGHLIGHT COMPARISON OF UC384XA VS. SG384X DISCHARGE CURRENT UC384xA 7.5 8.3 9.3 Mean SG384x Min. Limit 7.8 −3σ 8.8 +3σ SG384x Max. Limit Discharge Current Distribution - mA T A=25°C C URRENT M ODE PWM C ONTROLLER P RODUCTION D AT A S HEET T HE I NFINITE P OWER OF I NNOV A TION Copyright © 1995 Rev. 1.2 12/95 FOR FUR THER INFORMA TION CALL (714) 898-8121 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841 UC184xA/284xA/384xA LIN D OC #: 1840 1 |
Аналогичный номер детали - UC2844A |
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Аналогичное описание - UC2844A |
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