Name: MEAN WELL RQB40W12 series: Railway DC/DC converter - RQB40W12-110S54
Brand: MEAN WELL
SKU: RQB40W12-110S54
Price: 258.26 USD
Availability: InStock

MEAN WELL RQB40W12 series: Railway DC/DC converter - RQB40W12-110S54

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Description

RQB40W12-110S54 — Railway DC/DC converter

MEAN WELL RQB40W12-110S54 is a fully encapsulated quarter-brick isolated DC/DC converter with a 14–160 V DC input range and a single 54 V, 0.741 A output rated at 40 W. It provides remote ON/OFF, remote sense and output trimming for railway and industrial systems, with external circuits and thermal design selected for the installation.

Download MEAN WELL RQB40W12 Datasheet (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

RQB40W12 specifications, controls, thermal and mechanical drawings, EMC circuits and packing: PDF pages 1–9.

Electrical specifications

Model and output configuration	RQB40W12-110S54; isolated single-output DC/DC converter. The 110 code denotes nominal 110 V DC input and S denotes a single output.
Rated power	40 W, subject to the applicable input, load and thermal limits.
Output voltage	54 V DC
Output current	0.741 A
Minimum load	No minimum load required.
Nominal input voltages and input range	Nominal 24, 36, 48, 72, 96 and 110 V DC; operating input 14–160 V DC. The series is described as 12:1 wide input.
No-load and full-load input current	No load: 15 mA; full load: 410 mA. Values are the model-selection table entries; general catalogue test conditions are stated below.
Typical efficiency	90%
Series capability reference	RQB40W12 series efficiency is up to 90%; use this model's typical efficiency and operating limits for selection.
Maximum capacitive load	150 µF
Input filter and protection	Pi-type input filter; 7 A fast-acting fuse.
Input surge voltage	200 V DC for 1 s maximum.
Setup time	40 ms at 100% load and nominal input voltage.
Voltage accuracy	±1.0%
Ripple and noise	150 mVp-p; measured with 20 MHz bandwidth using a 12-inch twisted pair terminated with 0.1 µF and 47 µF capacitors.
Line and load regulation	Line: ±0.2%, low line to high line at rated load. Load: ±0.2%, measured from 0% to 100% rated load.
Switching frequency	250 kHz typical.
General measurement conditions	Unless separately specified: normal input 110 V DC, rated load, ambient 25°C and 70% RH.

Protection and control

Short-circuit protection	Continuous protection with automatic recovery.
Overload protection	110–180% of rated output power; automatic recovery after the fault condition is removed.
Overvoltage protection	Zener-diode clamp protection.
Overtemperature protection	Thermal shutdown at +115°C; automatic recovery after the fault condition is removed.
Input undervoltage lockout	Specification: start-up 14 V; shutdown 12 V typical, 11.5 V minimum.
Remote ON/OFF control	Referenced to −Vin: ON with R.C. >3 V up to 12 V DC, or open circuit; OFF below 1.2 V DC, or short R.C. to −Vin.
Remote sense	Remote voltage sensing is provided through the positive and negative sense pins identified in the model pin table.
Output trim range and connection	±10% typical. Connect the external trim-up resistor between Trim and −Vout; connect the trim-down resistor between Trim and +Vout. Observe output power, current and thermal limits after adjustment.
Trim calculation coefficients	For 54 V nominal output: Vref=2.5 V; R1=41.2 kΩ; R2=2 kΩ; R3=15.8 kΩ. V′ is the target output voltage.
Trim resistor formulas	Use consistent kΩ units. Up: A=Vref×R1/(V′−Vref); Rtrim_up=A×R2/(R2−A)−R3. Down: A=(V′−Vref)×R2/Vref; Rtrim_down=A×R1/(R1−A)−R3.
External UVLO adjustment	Connect an external resistor between UVLO and −Vin. Table 3 lists shutdown/start-up pairs: open 12.7/13.6 V; 140 kΩ 19.6/20.4 V; 62 kΩ 26.3/27.3 V. Its open-circuit pair differs from the specification values above; confirm the applicable threshold for the supplied module and circuit.

Supply interruption and external energy storage

Hold-up circuit	Use the illustrated external R1, D1 and hold-up capacitor network for short supply interruptions. Select the capacitor network for input voltage and load; the listed hold-up times are circuit references, not bare-module guarantees. R1 is recommended as 25 Ω/10 W and must withstand the start-up pulse energy associated with the bus voltage and capacitance.
Vbus capacitor and operating regions	An approximately 47 µF/200 V electrolytic capacitor between Vbus and −Vin is necessary when input is below 60 V DC. Vbus can supply or absorb transient power. The text states Vbus remains at 60 V below 56 V input and follows Vin above 60 V; the diagram marks the transition at 53/56 V.
Hold-up capacitance at 10 ms	Table reference, nominal Vin 24/48/72/96/110 V respectively: 800/800/440/180/120 µF (S2). The 24 V, 800 µF, 10 ms example is at full load.
Hold-up capacitance at 20 ms	Table reference, nominal Vin 24/48/72/96/110 V respectively: 1600/1600/800/440/300 µF (S3).
Hold-up capacitance at 30 ms	Table reference, nominal Vin 24/48/72/96/110 V respectively: 2200/2200/1200/540/400 µF (C2).

Thermal and environmental limits

Operating and case temperature	Working ambient: −40 to +90°C with derating; case temperature +105°C maximum. A graph extending beyond +90°C does not extend the stated working-temperature range.
Cooling and thermal design	Free-air/natural convection. Provide sufficient heat removal by conduction, convection and radiation for the actual installation; apply the model-specific derating curve and case-temperature limit.
Ambient-temperature derating	Natural-convection curve: 100% load from −40 to +65°C; 50% at +80°C and 35% at +90°C.
Thermal test PCB	The illustrated thermal-test layout is 137×88×1.6 mm with 2 oz copper; a local copper-area reference is 58.5×37 mm. It describes the test layout and heat conduction through the module to the PCB, not an included circuit-board accessory.
Working and storage humidity	Working: 5–90% RH, non-condensing. Storage: −55 to +125°C and 10–95% RH, non-condensing.
Temperature coefficient	0.05%/°C over 0 to +65°C.
Soldering conditions	Measure 1.5 mm from the case: 3–5 seconds at 260°C maximum.
Operating altitude	3000 m.

Isolation, railway standards and EMC

Safety approvals	CB IEC62368-1, UL62368-1 and EAC TP TC 020/2011 approved.
Railway standards	EN50155 / IEC60571 with the specified external circuits, including EN61373 shock/vibration and EN50121-3-2 EMC.
Isolation withstand voltage	Input–output: 3 kV DC or 2 kV AC.
Isolation resistance and capacitance	Input–output resistance: 1000 MΩ at 500 V DC, 25°C, 70% RH non-condensing. Isolation capacitance: 1500 pF typical.
EMC emissions	Conducted and radiated BS EN/EN55032 Class A/B require the corresponding external components and circuit. The suggestion circuits are referenced to 110 V DC input and full load; verify the complete equipment.
ESD and radiated immunity	BS EN/EN61000-4-2 Level 3, ±8 kV air and ±6 kV contact; BS EN/EN61000-4-3 Level 3, 10 V/m.
EFT and surge immunity	BS EN/EN61000-4-4 and -4-5 Level 3, ±2 kV on the power input port, with external input capacitance required: 330 µF/220 V.
Conducted and magnetic immunity	BS EN/EN61000-4-6 Level 3; the table prints 10 V/m. Magnetic-field BS EN/EN61000-4-8: Level 3; the source prints 10 V/m for this magnetic-field entry, so confirm the test magnitude and unit with the manufacturer.
Class A external-component reference	C1: 100 µF/200 V aluminum; C2/C4: 0.68 µF/250 V ceramic; C3: 47 µF/200 V aluminum; C5: 2200 pF/3 kV ceramic; C6: 1000 pF/3 kV ceramic; C7/C8/C9/C10: 1000 pF/2 kV ceramic. L1: 10 µH, GSTD1265PE-100M.
Class A circuit connections	L1 is in the positive input line. C1/C2 are across input before L1 and C3/C4 across module input. C5 bridges module +Vin to +Vout; C6 bridges −Vin to −Vout. C7/C8 and C9/C10 couple the input and output rails to the shielding-ground network; the case is connected as drawn.
Class B external-component reference	C1: 100 µF/200 V aluminum; C2/C3/C4/C5/C7/C8: 0.68 µF/250 V ceramic; C6: 47 µF/200 V aluminum. C9: 1000 pF/3 kV; C10: 1000 pF/3 kV; C11/C12/C13/C14: 4700 pF/2 kV, ceramic. L1: common choke A10 T16×12×8C, 2.2 mH ±35%.
Class B L2 and circuit scope	The drawing places L1 in both input rails and L2 in the positive input line. L2 is labelled “4.7 µF” with part GSTD1265PE4R7M, although the symbol is an inductor; confirm the correct unit and component before building this reference circuit. C9 couples module +Vin to +Vout and C10 couples −Vin to −Vout. C11/C12 and C13/C14 couple input/output rails to shielding ground; connect the case as drawn.

Mechanical integration and product information

Construction and dimensions	Fully encapsulated quarter-brick module with industry-standard pinout; aluminum baseplate and plastic case. 57.9×36.8×12.7 mm (2.28×1.45×0.5 inches).
Pin assignment	1 +Vin; 2 UVLO; 3 Remote ON/OFF; 4 Vbus; 5 −Vin; 6 −Vout; 7 RS−; 8 Trim; 9 RS+; 10 +Vout. Use the drawing orientation when laying out and wiring the PCB.
Pin and mounting geometry	Pins 6 and 10: Ø1.5 mm; pins 1, 2, 3, 4, 5, 7, 8 and 9: Ø1.0 mm. Pin extension: 4.1 mm. Two M3 threaded through mounting inserts; bottom-view references are 50.8 mm between pin rows, 47.2×26.2 mm mounting-insert offsets, and output-row spans 15.24 mm with a 7.62 mm half-span.
Mechanical tolerances	Dimensions in mm: x.x ±0.5; x.xx ±0.25. The general pin-size note specifies 1.x ±0.1 mm.
Recommended PCB footprint	Top-view footprint: 58.4 mm minimum ×37.3 mm minimum, on a 2.54 mm grid. Mounting holes Ø3.5±0.12 mm; small-pin holes Ø1.4±0.18 mm; large-pin holes Ø1.9±0.12 mm. Follow the individual hole positions in the model mechanical drawing.
Unit mass reference	68 g per unit, catalogue PACKING reference; not a measured net or shipment weight.
Packing reference	11 units per tube, tube gross weight 880 g; 132 units in 12 tubes per carton, carton gross weight 10.88 kg. Tube length 520 mm and illustrated cross-section 60.9×26.9 mm; carton L545×W145×H220 mm.
Reliability and warranty	205 Khrs MTBF to MIL-HDBK-217F at 25°C; 3-year manufacturer warranty.
Typical applications	Bus, tram, metro and railway systems; telecom/datacom, wireless networks, industrial control, instruments and analyzers. The fully encapsulated design addresses vibration, dust and temperature exposure within the specified installation and operating limits.

Installation and system verification

Complete-system EMC verification	Verify EMC with the converter installed in the final equipment and connected to a representative load. Wiring, assembly and the application affect the result. Follow the model's specified EMC conditions and any required external components; the linked EMI testing guidance does not certify the finished equipment.