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POWERBOX Defense Line DBC300 Series

  • Up to 300W Military supply
  • 85-264 VAC input voltage ranges. PFC
  • 1-2 isolated outputs
  • 200*80* 40mm very low profile
  • Industrial or ruggedizzed versions
  • Active very low inrush current
  • Many output configurations available
  • Conduction cooled 100°C baseplate
  • Safety IEC/EN 60950-1
  • RoHS lead-free-solder compliant

DBC300 Series

Product Overview

POWERBOX Defense Line 300 

Up to 300W Single and Dual Output AC/DC Rugged Switch Mode Power Supply 

Description   The DBC, very compact and low profile 300W AC/DC power supply in chassis format, incorporates input filtering, input and output protections, very robust mechanical mounting and connection, conformal coating and MIL-STD options required in most of the severe environment for industrial, defense applications. The PSU provides high reliability, high efficiency, input-to-output isolation, soft start and active very low inrush circuit, overtemperature protection, input over/undervoltage lockout. The PSU is configurable with 1 to 2 outputs in many output voltages from 3.3V to 48VDC, other outputs are even possible as semistandard versions, they are countinuously short-circuit proof. The 100°C baseplate allows operation in high temperature environment.


Input voltage 85-264VAC. 100-350VDC.
Frequency 47Hz min, 50Hz typ, 440Hz max
Power factor 0.96 typ, 230VAC, 50Hz, Pnom
Input current 4.5A at Vin min.
No-load input power 8W at Vin typ.
Peak inrush current 3A Vin max.
Start-up time 1s typ.
Input fuse A fuse mounted inside the psu protects against damages in case of a failure.
Fuse type Schurter, 5A, 3403.0173L.
Transient protection VDR and common mode input filter
Output Voltage See Selection Table
Redundant operation Requires external oring diodes.
Paralleling operation Active current share of identical m-boards with PR signal
Hold-up time Yes.
Output current prot. Constant current mode, automatic recovery.
Overvoltage protection Typically >120%Vnom, latching type
Remote on/off An isolated INHIB signal disable corresponding output voltage when connected to RTN.
Voltage adjustment 90-110%Vnom by build in trimmer or external 0.6-1.25V signal referred to RTN.
Remote sense V1, V2, total drop <0.5V, positive line drop <0.25V.
Powergood Common opto-isolated signal referred to RTN. Closed=OK. LED for each output.
Auxiliary bias voltage 5VDC, limited to 200mA.
Electric strength

Input to earth 1500Vrms.

Input to output 3000Vrms.

Output to earth 500Vrms.

Insulation resistance >100Mohms.
Dimensions 200 x 80 x 40mm
Weight/ 600g approx
Case Aluminum natural.
Options Description
MIL-STD ruggedized (-M) Meet MIL-STD 461E CE102, MIL-STD 1399-300A, MIL-STD810E shock & vibrations.

No laboratory certification.

-40°C operation (-T)

The thermal grade of the DC/DC converters used and other components are changed to comply with low ambient temperature.

Conformal coating (-V)

During manufacturing process , when V option is specified, components and pcb are covered with an acrylic coating to address high level of ambiant humidity application.

Heatsink (-H, -H1)

Thermal resistance: 1.8°C/W at natural convection, 0.6°C/W at 2m/s. -H: a 15 mm heatsink is mounted on the baseplate with longitudinal fins. -H1: a 15 mm heatsink is mounted on the baseplate with transversal fins

IP option (-IP)

Full IP65 enclosed mechanical available

Operating temperature -20°C to +85°C (T-option -40°C).
Heatsink temperature -20°C to +100°C (T-option -40°C).
Storage temperature -40°C to +125°C.
Over temp. protection 105°C ±5°C base plate, autorecovery <70°C
Damp heat MIL STD 810 Proc. 507-2.
Shock MIL STD 810 Proc. 516.3
Vibrations MIL STD 810 Proc. 514-5

Heatsink, GB, GF

40°C 285000 hrs 165000 hrs

70°C, 139500 hrs, 82300 hrs

100°C, 86500 hrs, 51000 hrs

Safety standards Built to meet IEC60950-1, EN60950-1.

Built to meet EN61000-4-5, 1kV, Criteria B. 2kV, Critiera A

Electrostatic discharge Built to meet EN61000-4-2, 8000V, Critiera B.
Fast transients/burst Built to meet EN61000-4-4, 4000V, Critiera B.
Harmonics Built to meet EN61000-3-2.

Built to meet EN61000-3-3.

Built to meet EN61000-4-3, -6, -11

Technical Illustration

  • DBC300 - Selection Table DBC300 - Selection Table
  • DBC300 - Derating Curve DBC300 - Derating Curve
  • DBC300 - Block Diagram DBC300 - Block Diagram
  • DBC300 - Mechanical DBC300 - Mechanical
  • DBC300 - Pin Connection DBC300 - Pin Connection
  • DBC300 - Pin Connection DBC300 - Pin Connection
  • DBC300 - Mechanical - H Option DBC300 - Mechanical - H Option
  • DBC300 - Mechanical - H1 Option DBC300 - Mechanical - H1 Option
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