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SG2845Y Datasheet(PDF) 1 Page - Microsemi Corporation |
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SG2845Y Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 12 page P RODU C T ION D AT A S HEET T HE I NFI N ITE P OW E R O F I N NOVATIO N L IN F IN IT Y M IC RO EL E C TRO N IC S I NC . 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 Copyright © 2000 Rev. 1.6c,2006-02-02 SG1844/SG1845 Series C URRENT M ODE PWM C ONTRO L LER DESCRIPTION The SG1844/45 family of control ICs provides all the necessary features to implement off-line fixed frequency, current- mode switching power supplies with a minimum number of external components. Current-mode architecture demonstrates improved line regulation, improved load regulation, pulse-by pulse current limiting and inherent protection of the power supply output switch. The bandgap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1844/45 has undervoltage lockout, current-limiting circuitry and start-up current of less than 1mA. The totem-pole output is optimized to drive the gate of a power MOSFET. The output is low in the off state to provide direct interface to an N-channel device. Both operate up to a maximum duty cycle range of zero to <50% due to an internal toggle flip-flop which blanks the output off every other clock cycle. The SG1844/45 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2844/45 is specified for the industrial range of -25°C to 85°C, and the SG3844/45 is designed for the commercial range of 0°C to 70°C. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT H I GHLIGHT AC INPUT SG3844 R ST I ST V CC K EY FE AT UR ES OPTIMIZED FOR OFF-LINE CONTROL LOW START-UP CURRENT (<1mA) AUTOMATIC FEED FORWARD COMPENSATION TRIMMED OSCILLATOR DISCHARGE CURRENT PULSE-BY-PULSE CURRENT LIMITING ENHANCED LOAD RESPONSE CHARACTERISTICS UNDER-VOLTAGE LOCKOUT WITH 6V HYSTERESIS (SG1844 only) DOUBLE PULSE SUPPRESSION HIGH-CURRENT TOTEM-POLE OUTPUT INTERNALLY TRIMMED BANDGAP REFERENCE 500kHz OPERATION UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE HIGH RELI A B I LI TY FE AT URES AVAILABLE TO MIL-STD-883B LINFINITY LEVEL "S" PROCESSING AVAILABLE PACKAGE ORDER INFO M Plastic DIP 8-Pin N Plastic DIP 14-Pin DM Plastic SOIC 8-Pin D Plastic SOIC 14-Pin Y Ceramic Dip 8-Pin J Ceramic DIP 14-Pin F Cer Flatpack 10-Pin L Ceramic LCC 20-Pin TA (°C) RoHS Compliant / Pb-free Transition DC: 0503 RoHS Compliant / Pb-free Transition DC:0440 SG3844M SG3844N SG3844DM SG3844D SG3844Y SG3844J 0 to 70 SG3845M SG3845N SG3845DM SG3845D SG3845Y SG3845J SG2844M SG28424N SG2844DM SG2842D SG2844Y SG2844J -25 to 85 SG2845M SG2845N SG2845DM SG2845D SG2845Y SG2845J SG1844Y SG1844J SG1844L -55 to 125 SG1845Y SG1845J SG1845L SG1842Y/883B SG1844J/883B SG1844L/883B MIL- STD/883 SG1845Y/883B SG1845J/883 SG1845L/883B DESC SG1844Y/DESC SG1844J/DESC SG1844F/DESC SG1844L/DESC Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LXSG3844N-TR) |
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Similar Description - SG2845Y |
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