Railway DC/DC Converter  78 Watts

There are two different versions of this compact DC-DC converter available, which can be mounted for space-saving on case walls or on PCB.

The offered output voltages are 3.3V, 5V, 12V, 15V, 24V and 30V. The modules show filtering at the input acc. to EN 55022 (conducted), class B. This makes the converter suitable for high requirement railway and industry application

Special Features

  • Electrostatic discharge according to EN 61000-4-2:2009 (testing level 4): 8 kV contact (base plate)/ 15 kV air
  • Burst transients according to EN 61000-4-4:2004 (class 3): 2 kV
  • Surge according to EN 61000-4-5:2006 (class 2): 0,5 kV symmetric
  • Conducted immunity according to EN 61000-4-6:2007
  • Conducted emission: Input filtering according to EN 55022:2006, class B (QP)*
  • Reverse polarity protection (by external fuse)
  • Zero load operation and short circuit protected
  • Parallel and series connection
  • Overtemperature shutdown
  • No overshoot of output voltage at switching on
  • Remote off (EN) with TTL – L-signal
  • Overvoltage protection in the output circuit, even in case of external supply (OVP)
  • Extremly low thermal stress of sensitive components due to dissipated power loss over mounting surface
  • Vibration resistant and indifferent to humidity due to encapsulated case

Specifications Table

Specificationsat  ϑamb=25° C, Vin nom, 0,62 Iout nom
Ambient air  ϑamb = -40° C…+85° C
Storage ϑS = -40° C…+100° C
Rise in case∆   ϑCperm ≤ 20 K
Permissible rise on base plate∆  ϑB perm≤ 25 K
Necessary thermal resistance of mounting surface (chassis) to ambient R thBA≤ 3 K/W
Output voltages
Tolerance (AVP/Ks)∆  V out ≤  ±0,25 (0,5)%**
Output ripple at  amb = -40°C…+85°CV out ripple≤  3,5%
Temperature coefficient TC≤  0,016%/K
Regulation at  amb = -40°C…+85°C
Line reg. for Vin range∆ V out ≤ 2mV
Load reg. static∆  V out ≤ 10mV/A***
Load change (25°C)∆ V out≤ 38 (23)mV/A ****
Starting point /% Vout off≤ 130% V out nom
Admissible continuous external current /ext ≤ 4,5A
Isolation voltage-strength
In-/Output≥ 1,5 kVrms
Input to base plate≥ 1,5 kVrms
Output to base plate≥  0,5 kVrms
Resistance In-/OutputRiso≥ 1,5 GOhm
Capacitance In-/OutputCiso  = 2200 pF
Weight AVP/Ks, …/Ksl / AVP/KspM ca. 315/295g