LES B Series

80 watt Eighth-Brick Isolated DC-DC Converters

The LES B series of eighth-brick isolated DC-DC converters comprises eigth single output models offering fully regulated voltages of 1 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V or 12.0 V. These converters can deliver up to 25 amps and up to 80 watts of output power, depending on the particular model. They have a wide 2:1 input range of 36 to 75 Vdc and are designed primarily for use with standard 48 V telecommunications equipment supplies.

LES B series converters have a typical efficiency of up to 92% and accommodate an ambient operating temperature range of -40 to 85˚C. Their open-frame design is optimized for forced air or conduction cooling and there is a choice of surface-mount or through-hole terminations. The conversion technology employs 500 kHz fixed frequency switching to help minimize external EMI filtering requirements.

Standard features include output trim, remote enable, undervoltage lockout and differential remote sense, with non-latching overvoltage and overtemperature protection. LES B series converters have an installed height of just 0.33 inch (8.4 mm), making them ideal for systems with demanding inter-board spacing requirements.

Datasheet Technical Documentation Print This Page
  • Total Max Power:
    80 W
  • Total Max Current:
    25 A
  • Input Voltage:
    36 V to 75 V
  • Output Voltage:
    1 V to 12 V
  • Outputs:
  • Size (L x W x H):
    2.300" x 0.900" x 0.360"
  • Warranty:
    2 years
  • Operating Temperature:
    -40°C to +85°C

Electrical Specifications

  • Input
  • Output
  • Logic Control
  • Isolation
  • Input Surge: 100 V / 100 ms
  • Input Voltage: 36 - 75 VDC
  • Ripple & Noise: 30 mV (typ)
  • Load Regulation: ±0.2 %Vo
  • Line Regulation: ±0.1 %Vo
  • Enable Logic: Negative (suffix N) or Positive (Blank)
  • Isolation Voltage: 2250 VDC
  • High Efficiency
  • Regulation To Zero Load
  • Fixed Frequency Switching
  • Industry Standard Features: Input UVLO, Enable, OVP, OCP, OTP, O/P Trim, Remote Sense
  • Through Hole or Surface Mount (suffix "S") Termination
  • Basic Insulation
  • EU Directive 2002/95/EC Compliant For RoHS

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