PRELIMINARY DATA SHEET D LND081A/B/C Up to 277VAC/347VAC/1000VAC True One-Wire Adjustable Offline Voltage Sources GENERAL DESCRIPTION FEATURES The LND081A/B/C are single wire high voltage conductor, low cost solutions for deriving from AC offline voltages a DC output between 2.7V and 100V with mA’s to 100’s of mA’s of current. The LND081A are for 28VAC, 48VAC, 120VAC or 277VAC sources and include the input full bridge diodes. The LND081B is for 347VAC applications and the LND081C is for up to 1000VAC but require external full bridge diodes. The LND081A are packaged in 8 pin EPAD SOIC packages. LND081B/C are available as bare die. EQUIVALENT CIRCUIT Adjustable offline voltage source 2.7V to 100V adjustable output voltage 100’s of mA drive capability Lowest cost solution LND081A/B include full bridge diodes Universal Input: 28VAC, 48VAC or 120VAC (A) Up to 277VAC (A), 347VAC(B) Up to 1000VAC (C) One wire HV conductor eliminates need for multiple input wires Resistor programmable output voltage against a diode threshold Replaces standard transformer or AC divider solutions Lower leakage than MOSFET, IGBT, BIPOLAR, XFMR or CAP solutions 8 pin EPAD-SOIC Package APPLICATIONS Typical Waveforms No Output Capacitor 120VAC Input – Dark Blue Output – Light Blue Offline uC or PLC voltage supplies Industrial AC communications loop derived supplies Electric grid remote supplies for monitoring equipment Emergency lighting, monitoring equipment, industrial plant supplies White goods TYPICAL APPLICATION CIRCUIT 0.1uF, 100V or Fuse 2.7 to 100V AC+ 100uF Output Capacitor 85VAC Input – Light Blue Output 12VDC – Dark Blue A C VOUT ACVREF L O A D 85- 277VAC GND Linear Dimensions Semiconductor Inc. 22620 Ricardo Rd, Cupertino CA 95014 USA tel 312.321.1810 fax 312.321.1830 www.lineardimensions.com