Name: MEAN WELL LDC-55 series: non-dimmable constant-power LED driver - LDC-55
Brand: MEAN WELL
SKU: LDC-55
Price: 65.06 USD
Availability: InStock

MEAN WELL LDC-55 series: non-dimmable constant-power LED driver - LDC-55

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Description

LDC-55 linear LED driver

MEAN WELL LDC-55 is a 55 W non-dimmable linear LED driver with resistor-selectable constant-current output from 500 to 1600 mA (1050 mA factory default). Match the LED string to the 27–56 V operating envelope and the selected current; the rated power and the catalog I–V boundary must both be respected.

Download MEAN WELL LDC-55 Datasheet (PDF)Download MEAN WELL LED Installation Manual

SLD/LDC catalog, PDF pages 28–36; LDC-55 specification dated 2026-02-09. The suffix identifies the fitted control interface.

Output and current selection

Model and function	LDC-55; non-dimmable. Slim metal housing, active PFC and a catalog flicker-free design with low output-current ripple.
Rated output power	55 W maximum within the published constant-power operating envelope. No temporary overload or peak-power rating is specified.
Output current region	500–1600 mA; factory default 1050 mA. Preset the rated current with an external resistance across IADJ, rather than a DIP switch.
Constant-current voltage region	27–56 V, subject to the current-setting I–V diagram. The low-current corner has a higher minimum voltage; the whole voltage/current rectangle is not usable. Select the LED string inside the shaded operating area.
Full-power current range	980–1600 mA as listed in the specification; output voltage × current must remain at or below 55 W and inside the I–V boundary.
Open-circuit voltage	60 V maximum.
Low-frequency current ripple	3.0% maximum at rated current.
Current tolerance	±5.0%.
Current-setting connection	Connect the setting resistor between TB2 pins 7 and 8 (IADJ). The table below lists catalog nominal values. NC means an open setting-resistor connection, which gives 500 mA; it is distinct from the stated factory default. Select the current to match the LED load and its operating voltage.

External IADJ resistance → nominal current

18 kΩ	1600 mA
20 kΩ	1520 mA
24 kΩ	1450 mA
27 kΩ	1320 mA
30 kΩ	1260 mA
33 kΩ	1200 mA
36 kΩ	1150 mA
39 kΩ	1110 mA
43 kΩ	1060 mA
47 kΩ	1030 mA
56 kΩ	950 mA
68 kΩ	880 mA
91 kΩ	800 mA
150 kΩ	700 mA
200 kΩ	650 mA
NC / open	500 mA

Input and electrical performance

AC input	180–295 VAC, 47–63 Hz. The current specification publishes no DC input operating range.
Input/load derating	At 60 Hz, the static-characteristic plot shows 100% load over 180–295 VAC. Temperature and I–V operating limits still apply.
Setup time	500 ms at 230 VAC. Measured at the first cold start; switching the supply ON/OFF can increase setup time.
Efficiency	90% typical at 230 VAC, full load.
Power factor	Typical PF ≥0.95 at 230 VAC and load ≥50%; PF ≥0.90 at 277 VAC and load ≥75%.
Total harmonic distortion	THD <10% at load ≥50% on 230 VAC, or load ≥75% on 277 VAC.
AC current (typical)	0.35 A at 230 VAC; 0.25 A at 277 VAC.
Inrush current (typical)	Cold start 30 A at 230 VAC; 300 μs pulse width measured at 50% of peak current, per NEMA 410.
Circuit-breaker reference	At 230 VAC: up to 17 units on a 16 A type B breaker, or 29 on a 16 A type C breaker. The installation manual bases its matching values on ABB S200 breakers; verify the actual breaker and installation.
Leakage current	<0.75 mA at 277 VAC.
Low-load power	Catalog no-load/standby consumption <0.5 W.
ErP installation condition	Use behind a switch; do not leave the LED power supply permanently connected to the mains when meeting the cited ErP lighting-fixture requirements.

Control interface

Fitted control	Blank suffix: non-dimmable standard version. External IADJ resistance selects the rated current; it does not add the B, DA or DA2 control interface.
Family options	LDC-55B provides 3-in-1 control and LDC-55DA provides DALI/PUSH; LDC-55DA2 provides DALI-2/PUSH. These are separate order variants, not additional fitted functions of this SKU.

Temperature compensation, protection and environment

NTC connection	Connect an external temperature-sensing NTC across TB2 pins 5 and 6, with its sensing point on the lighting system or surrounding environment. Without an NTC, the driver runs at the current selected through IADJ.
NTC characteristic	Below 33 kΩ, output current decreases as NTC resistance decreases; above 33 kΩ, output current remains normal. The table does not specify the exact equality point. MEAN WELL does not supply the NTC; the published values were measured using resistance. Check the temperature curve when selecting a new NTC brand.
NTC/control interaction	The temperature-compensation function acts on the preset output current; no remote dimming interface is fitted.
Short-circuit protection	Hiccup mode or constant-current limiting; automatic recovery after the fault is removed.
Overvoltage protection	61–80 V. Output shutdown with automatic recovery or recovery after re-powering, as stated in the catalog.
Overtemperature protection	Output shutdown with automatic recovery.
Case-temperature range	Tcase −25 to +80°C; maximum case temperature +80°C. Measure at the marked tc location in the mechanical drawing.
Ambient/load derating	Horizontal mounting: 100% load from −25 to +50°C; the plotted points are 80% at +60°C and 60% at +65°C. The ambient curve ends at +65°C. Meet both ambient-load and maximum-case-temperature limits; a case-temperature rating is not an unrestricted ambient rating.
Case/load curve	The horizontal-mounting case curve remains at 100% through +80°C and ends there. This does not override ambient-temperature derating.
Cooling and altitude	Free-air convection. Nonstandard mounting or higher ambient temperature may require further current derating. Above 2000 m altitude, reduce the allowed ambient temperature by 3.5°C per additional 1000 m for this fanless driver.
Working humidity	20–95% RH, non-condensing.
Storage conditions	−40 to +80°C; 10–95% RH.
Temperature coefficient	±0.03%/°C over 0–60°C.
Vibration	10–500 Hz, 2 G; 10 minutes per cycle, 60 minutes along each X, Y and Z axis.
Performance-plot conditions	PF, THD and efficiency plots use Tcase 75°C. THD and efficiency examples use a 1100 mA setting; they do not replace the tabulated typical efficiency or the operating envelope.
Lifetime reference	Typical life expectancy >50,000 operating hours when Tcase, especially at the marked tc point, is about 70°C or less. Lifetime decreases with increasing case temperature; this is a catalog operating-life reference, not a separate warranty duration.
MTBF	2521 K hours minimum, Telcordia SR-332 (Bellcore); 226.1 K hours minimum, MIL-HDBK-217F at 25°C.

Mechanical installation and terminals

Dimensions	320 × 30 × 21 mm (L × W × H); metal case 258A. Mechanical drawing tolerance ±1 mm.
Mounting geometry	Two Ø4.5 mm end mounting locations, 313 mm center spacing, 3.5 mm from each end; use the exact drawing and allow ventilation.
TB1 input terminals	Pin 1 = AC/L; pin 2 = AC/N; pin 3 = NC; pin 4 = FG. Connect FG to protective earth.
TB2 output and adjustment	Pins 1–2 = Vo+; pins 3–4 = Vo−; pins 5–6 = NTC; pins 7–8 = IADJ. Observe LED polarity and do not exceed the selected current/power envelope.
Conductor and strip lengths	TB1: 0.5–0.75 mm²; TB2: 0.2–0.5 mm². Strip 8–9 mm for each terminal block. Use approved conductors with adequate current rating and system insulation.
Unit mass reference	255 g per unit, converted from the catalog PACKING single-unit reference. This is not a measured shipment or carton weight.

Safety, EMC and specification conditions

Construction and safety	SELV output and Class 2 power-supply design are stated in the catalog. Class 2 does not remove the fitted FG/protective-earth connection requirement.
Safety standards	Catalog approvals: UL 8750; CSA C22.2 No. 250.13-12; ENEC BS EN/EN 61347-1 and 61347-2-13; AS/NZS 61347.1 and AS/NZS IEC 61347.2.13; BS EN/EN 62384; GB/T 19510.1 and 19510.213; EAC TP TC 004; BIS IS 15885.
Withstand voltage	Input–output: 3.75 kVAC; input–FG: 2.0 kVAC; output–FG: 1.5 kVAC.
Isolation resistance	Input–output, input–FG and output–FG: 100 MΩ at 500 VDC, 25°C and 70% RH.
EMC emissions	BS EN/EN 55015; BS EN/EN 61000-3-2 Class C at load ≥50%; BS EN/EN 61000-3-3; GB/T 17743; GB 17625.1; EAC TP TC 020.
EMC immunity	BS EN/EN 61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN 61547, light-industry level. Surge: line–earth 2 kV, line–line 1 kV; EAC TP TC 020.
Specification conditions	Unless specified otherwise, parameters are measured at 230 VAC input, rated current and 25°C ambient. The driver is a component for integration into final equipment, whose complete installation must be requalified for EMC.
Warranty	The manufacturer catalog states a 5-year warranty, subject to MEAN WELL’s warranty statement and applicable conditions.

Installation and selection notes

Installation safety	Disconnect the mains supply and prevent accidental reconnection before installation or maintenance. Have faults examined by a qualified technician; do not open the power-supply case yourself.
Ventilation and mounting	Keep ventilation clear and do not stack objects on the unit. Keep 10–15 cm clearance when the adjacent device is a heat source. Follow this model’s mounting, ambient-temperature and output-derating requirements.
System wiring and protection	Use approved primary and secondary wiring rated for at least the applicable unit current. Provide suitable system-level insulation and an enclosure around single-insulated wiring; verify EMC again in the completed system. Connect a fitted FG terminal to protective earth; the manual exempts only units marked Class II and ungrounded.
Environmental and load limits	Do not immerse the unit or install it near fire or above its specified ambient limit. Keep output current and power within the model’s rated operating envelope. If a fitted external flexible cable is damaged, replacement is limited to the manufacturer, its service agent or a similarly qualified person.
Selection and accessories	Choose the complete suffix for the required control interface. The current catalog does not give a dedicated MEAN WELL accessory order code for this driver. External setting resistors, NTC sensors, dimming controllers and pushbuttons must be selected for the actual interface; the NTC is explicitly not supplied by MEAN WELL.
Applications	Linear lighting and LED fixtures such as office, panel and indoor lighting applications, subject to the fixture design, electrical ratings and thermal conditions.