SG1842/SG1843 Current Mode PWM Controller Features Description Optimized For Off-Line Control The SG1842/43 family of control IC s provides all the Low Start-Up Current (<1mA) necessary features to implement off-line fixed Automatic Feed Forward Compensation frequency, current-mode switching power supplies Trimmed Oscillator Discharge Current with a minimum number of external components. Pulse-By-Pulse Current Limiting Current-mode architecture demonstrates improved Enhanced Load Response Characteristics line regulation, improved load regulation, pulse-by- Under-Voltage Lockout with 6V Hysteresis (SG1842 pulse current limiting and inherent protection of the only) power supply output switch. The bandgap reference is trimmed to 1% over temperature. Double-Pulse Suppression Oscillator discharge current is trimmed to less than High-Current Totem-Pole Output (1A Peak) 10%. The SG184 2/43 has under-voltage lockout, Internally Trimmed Bandgap Reference current limiting circuitry and start-up current of less 500kHz Operation than 1mA. The totem-pole output is optimized to drive Undervoltage Lockout the gate of a power MOSFET. The output is low in SG1842 - 16 volts the off state to provide direct interface to an SG1843 - 8.4 volts N-channel device. The SG1842/43 is specified for Low Shoot-Through Current <75mA Over operation over the full military ambient temperature Temperature range of -55C to 1 25C. The SG2842/43 is specified for the industrial range of -25C to 85C, and the SG3842/43 is designed for the commercial range of Application 0C to 70C. Available To MIL-STD 883, 1.2.1 Available to DSCC - Standard Microcircuit Drawing (SMD) Product Highlight R ST I ST AC INPUT V cc SG3842/43 Figure 1 Product Highlight October 2014 Rev. 1.7 www.microsemi.com 1 2014 Microsemi Corporation Current Mode PWM Controller Connection Diagrams and Ordering Information Ambient Type Packaging Package Part Number Connection Diagram Temperature Type V COM REF SG3842M V V FB CC 0C to 70C OUTPUT I SENSE SG3843M 8-PIN PLASTIC GND R /C M T T DUAL INLINE Plastic DIP PACKAGE SG2842M M PACKAGE (Top View) -25C to 85C M Package: RoHS / Pb-free 100% Matte Tin Lead Finish SG2843M SG3842Y 0C to 70C SG3843Y V COM REF SG2842Y -25C to 85C V V FB CC SG2843Y OUTPUT I SENSE 8-PIN SG1842Y -55C to GND CERAMIC R /C T T Y CERDIP 125C SG1843Y DUAL INLINE Y PACKAGE PACKAGE SG1842Y-883B (Top View) MIL-STD/883 SG1843Y-883B PbSn Tin Lead Finish SG1842Y-DESC DESC SG1843Y-DESC COM SG3842DM V REF V 0C to 70C FB V CC 8-PIN SMALL SG3843DM I OUTPUT SENSE OUTLINE DM SOIC GND R /C T T INTEGRATED SG2842DM DM PACKAGE CIRCUIT -25C to 85C (Top View) SG2843DM RoHS / Pb-free 100% Matte Tin Lead Finish COM V REF SG3842D N.C. N.C. 0C to 70C V V CC FB V 14-PIN SMALL C N.C. SG3843D OUTPUT OUTLINE I SENSE D SOIC GND INTEGRATED N.C. SG2842D PWR GND R /C T T CIRCUIT -25C to 85C D PACKAGE (Top View) SG2843D RoHS / Pb-free 100% Matte Tin Lead Finish SG3842N COM V REF 0C to 70C N.C. N.C. SG3843N V V CC FB V 14-PIN DUAL C N.C. OUTPUT INLINE PLASTIC I SENSE SG2842N N GND N.C. PLASTIC DIP POWER GND R /C T T PACKAGE -25C to 85C N PACKAGE (Top View) SG2843N N Package: RoHS / Pb-free 100% Matte Tin Lead Finish 2