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UC384XAD Datasheet(PDF) 1 Page - Microsemi Corporation |
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UC384XAD Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 8 page P RODU C T ION D AT A S HEET T HE I NFI N ITE P O W ER OF I N NOVATIO N L IN F IN IT Y M IC ROEL E C TRON IC S I NC . 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 Copyright © 1995 Rev. 1.2a,2005-03-09 UC184xA / 284xA / 384xA C URRENT M ODE PWM C ONTRO L LER DESCRI PTI O N 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 components. 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 programmable oscillator to set frequency and maximum duty cycle. The undervoltage 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. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT H I GHLIGHT COMPARISON OF UC384XA VS. SG384X DISCHARGECURRENT UC384xA 7.5 8.3 9.3 Mean SG384x Min. Limit 7.8 -3 s 8.8 +3s SG384x Max. Limit Discharge Current Dist ribution - mA T A=25 C KEY FEATUR ES LOW START-UP CURRENT. (0.5mA max.) TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. AUTOMATIC FEED FORWARD COMPENSATION. PULSE-BY-PULSE CURRENT LIMITING. ENHANCED LOAD RESPONSE CHARACTERISTICS. UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. DOUBLE PULSE SUPPRESSION. HIGH-CURRENT TOTEM POLE OUTPUT. INTERNALLY TRIMMED BANDGAP REFERENCE. 500KHz OPERATION. LOW RO ERROR AMPLIFIER. KEY FEATUR ES ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. DC-DC BUCK OR BOOST CONVERTERS. LOW COST DC MOTOR CONTROL. Available Options Part# Start-Up Voltage Hysteresis Max. Duty Cycle UCx842A 16V 6V <100% UCx843A 8.4V 0.8V <100% UCx844A 16V 6V <50% UCx845A 8.4A 0.8V <50% PACKAGE ORDER INFO M Plastic DIP 8-Pin DM Plastic SOIC 8-Pin D Plastic SOIC 14-Pin Y Ceramic DIP 8-Pin TA (°C) RoHS Compliant / Pb-free Transition DC: 0503 RoHS Compliant / Pb-free Transition DC: 0440 0 to 70 UC384xAM UC384xADM UC384xAD - -40 to +85 UC284xAM UC284xADm UC284xAD UC284xAY -55 to 125 - - - UC184xAY Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. UC3842ADM-TR) |
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Similar Description - UC384XAD |
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