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125 Watt

Quarter Brick Regulated, 2:1 Input


High efficiency with no minimum load

With a single output up to 35A, our 125 watt quarter brick DC-DC converter is UL- and CE-approved and features an adjustable output voltage, no minimum load and a compact quarter brick package of 2.28" x 1.45" x 0.50".

 

INPUT

  • Input Voltages
    • 48 Vdc: 36 - 72 Vdc
  • Input Filter: L-C Type
  • Start Up Time: Nominal Vin and Constant Resistive Load
  • Power Up: 25 mS Typ
  • Remote ON/OFF: 25mS Typ
    • Negative Logic
      • DC-DC ON: Short or OV<Vr<1.2V
      • DC-DC OFF: Open or 3.5V<Vr<15V
    • Positive Logic
      • DC-DC ON: Open or 3.5V<Vr<15V
      • DC-DC OFF: Short or OV<Vr<1.2V

OUTPUT

  • Voltage Accuracy (FL and Nominal Vin): ±1.5%
  • Voltage Adjustability: +10%, -20%
  • Line Regulation
    • LL to HL at FL: ±0.2%
  • Load Regulation
    • NL to FL:
      • 1.8 Vdc: 5.4 mV, ±0.1%
      • 2.5 Vdc: 7.5 mV, ±0.1%
      • 3.3 Vdc: 10 mV, ±0.2%
      • 5 Vdc: 15 mV, ±0.2%
  • Ripple and Noise (20 MHz BW)
    • Measured with a 1uF M/C & a 1OuFT/C: 100 mVp-p
  • Temperature Coefficient at FL: ±0.02%/°C, max
  • Transient Response, 25% load step change: 200µS

GENERAL

  • Efficiency: 84 - 90%
  • Isolation Voltage: 1600 Vdc, min.
  • Isolation Resistance: 107 Ohms, min.
  • Switching Frequency: 270 KHz, typ.

PROTECTIONS

  • Over Voltage Protection: 120% Vout max.
  • Over current protection threshold: 110 - 140% of load
  • Short circuit protection: hiccup, automatic recovery

ENVIRONMENTAL

  • Operating Base Plate Temperature Range: -40 to 100°C
  • Storage Temperature Range: -55 to 125°C
  • Humidity, Max, Non-Condensing: 95%

PHYSICAL

  • Case Material: Aluminum base-plate
  • Weight: 42 g (1.46 oz.)
  • Dimensions: 2.28" x 1.45" x 0.50" Package (57.9 X 36.83 X 12.7 mm)

EMC CHARACTERISTICS

  • Conducted Emissions:
    • EN55022, Level A
    • EN55022, Level B
  • Radiated Emissions: EN55022, Level A
  • ESD: EN61000-4-2, Perf. Criteria 2
  • Radiated Immunity: EN61000-4-3, Perf. Criteria 2
  • Fast Transient: EN61000-4-4, Perf. Criteria 2
  • Surge: EN61000-4-5, Perf. Criteria 2
  • Conducted Immunity: EN61000-4-6, Perf. Criteria 2

 

Input Voltage
Nominal (Range) (Vdc)
Output Voltage
(Vdc)
Output Current
(mA)
Efficiency
%
Model Number Case
48 (36-72) 1.8 35000 84 OFQ125-48S1.8 O
2.5 35000 86 OFQ125-48S2.5 O
3.3 30000 88 OFQ125-48S3.3 O
5 25000 90 OFQ125-48S5.0 O