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AMC384XBD Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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1 / 10 page AMC DOC. #: AMC3842B_C (LF) March 2004 AMC3842B/43B DESCRIPTION FEATURES The AMC3842B/43B are fixed frequency current-mode PWM controllers specially designed for OFF-Line switching power supply and DC-to-DC converters with a minimum number of external components. These devices feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem pole output which is suitable for driving MOSFETs. The under voltage lock-out (U.V.L.O.) is designed to operated with 200 µA typ. start-up current, allowing an efficient bootstrap supply voltage design. The U.V.L.O. thresholds for the AMC3842B are 16V (on) and 10V (off) which are ideal for off-line applications. The corresponding typical threshold for the AMC3843B are 8.4V (on) and 7.6V (off). The AMC3842B/43B can operated within 100% duty cycle. Low Start-Up current ( typ. 200µA) Optimized for Off-Line and DC-to-DC Converters Maximum Duty Cycle U.V.L.O. with Hysteresis Operating Frequency Up to 500KHz Internal Trimmed Bandgap Reference High Current Totem Pole Output Error Amplifier With Low Output Resistance Available in 8-Pin Plastic DIP and Surface Mount 14-Pin S.O.I.C. Identical pin assignment to earlier UC384X series. ® ADD MICROTECH CORP. CURRENT MODE PWM CONTROLLER APPLICATIONS PACKAGE PIN OUT Off-line flyback or forward converters. DC-to-DC buck or boost converter. Monitor Power Supply 8-Pin Plastic DIP (Top View) AVAILABLE OPTIONS Device Start-UP Voltage Hysteresis Max. Duty Cycle AMC3842B 16V 6V < 100% AMC3843B 8.4V 0.8V < 100% 14-Pin Plastic S.O.I.C. Surface Mount (Top View) 8-Pin Plastic S.O.I.C. Surface Mount (Top View) VREF COMP VCC VFB ISENSE OUTPUT RT/CT GND VREF COMP NC VCC NC VREF COMP VFB VFB VCC VC NC ISENSE ISENSE OUTPUT OUTPUT RT/CT GND NC GND RT/CT PWR ORDER INFORMATION Plastic DIP-8 Plastic SO-14 Plastic SO-8 TA ( OC) M 8-pin D 14-pin DM 8-pin 0 to 70 AMC384XBM AMC384XBD AMC384XBDM 0 to 70 AMC384XBMF(Lead Free) AMC384XBDF(Lead Free) AMC384XBDMF(Lead Free) Note: 1.All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC384XBDT, or AMC384XBDMT). 2.The letter ”F” is marked for Lead Free process. Copyright © 2002, ADD Microtech Corp. 1 www.addmtek.com |
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