LND081A Datasheet, PDF (1/1 Pages) Linear Dimensions Semiconductor – Up to 277VAC/347VAC/1000VAC True One-Wire Adjustable Offline Voltage Sources

PRELIMINARY DATA SHEET
D
LND081A/B/C
Up to 277VAC/347VAC/1000VAC True One-Wire
Adjustable Offline Voltage Sources
GENERAL DESCRIPTION
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
Typical Waveforms
No Output Capacitor
120VAC Input – Dark Blue
Output – Light Blue
FEATURES
 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
 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
100uF Output Capacitor
85VAC Input – Light Blue
Output 12VDC – Dark Blue
0.1uF, 100V
or Fuse
AC+
A
AC-
C
85- 277VAC
2.7 to 100V
VOUT
L
VREF
O
A
D
GND
 Linear Dimensions Semiconductor Inc.  22620 Ricardo Rd, Cupertino CA 95014 USA  tel [phone]  fax [phone]  www.lineardimensions.com 