MEAN WELL LDDS-H series: DC/DC constant-current step-down LED driver - LDDS-250HW

Description

MEAN WELL LDDS-250HW DC/DC LED Driver

MEAN WELL LDDS-250HW is an LDDS-H series DC/DC constant-current step-down LED driver with 250 mA rated output and remote ON/OFF control. It accepts 12-56 VDC and drives a 2-45 VDC LED string subject to the catalog's 4 V input-to-output headroom requirement. This wire-style, fully encapsulated module is intended for DC battery, commercial, portable, track and landscape lighting applications.

Download MEAN WELL LDDS-H Datasheet (PDF)

Model Selection

Parameter Specification
Series and current code LDDS-H; 250 denotes the rated 250 mA output. The family offers fixed current ratings of 250, 300, 350, 500, 700 and 1000 mA.
W and function suffix W denotes wire style. The blank function suffix denotes remote ON/OFF control; the separately ordered B version has three-in-one dimming.
Application class The catalog describes Class III (SELV) lighting applications. Select an appropriate DC supply and verify the completed lighting system.
Track-adapter application The catalog lists STUCCHI track-adapter applications. Confirm the actual mechanical fit, wiring and LED load; a track adapter is not identified as an included accessory.

Output and Input

Parameter Specification
Rated output current 250 mA constant current.
LED forward-voltage range 2-45 VDC. Maintain the catalog-specified 4 V step-down headroom from the DC input; input and LED-string voltage must be selected together.
Power at the voltage limit 11.25 W at 45 V and 250 mA, calculated as V × I. This is subject to input headroom and temperature limits; the family-level 45 W description is not every model's output rating.
Current accuracy ±5% typical at 48 VDC input (or 24 VDC).
Ripple and noise 150 mVp-p maximum; measured with 20 MHz bandwidth using a 12-inch twisted pair terminated with a 0.1 µF capacitor.
Switching frequency 40-1000 kHz; this is distinct from the external dimming-signal frequency.
External capacitive load 2.2 µF maximum.
DC input 12-56 VDC; nominal test input 48 VDC. Use DC supply connections as shown in the model wiring diagram.
Efficiency 94% typical at 48 VDC input, 36 VDC output, without dimming. The series headline is up to 96%; the plotted efficiency also varies with LED-string voltage and input voltage.
Input current 200 mA at full load under the 48 VDC input / 36 VDC output test condition; 6 mA at no load.
Input filter Capacitor input filter and built-in EMI filtering.
General test conditions Unless otherwise stated: normal 48 VDC input, rated load, 25°C ambient and 70% RH. The efficiency plots compare 24 V and 48 V input over different LED counts; they are not one efficiency guarantee for every load.

Control Connections

Parameter Specification
Control reference Connect DIM(-) to -Vin. Control voltages are referenced to -Vin; leave the control input open when unused.
ON/OFF thresholds ON: control voltage above 2.5 V up to 15 VDC, or open circuit. OFF: below 0.3 VDC, or shorted to -Vin. Observe the specific control curves for the ordered function suffix.
Standard HW application curve The HW standard-application plot shows approximately 20% output at a 0.5 V control input, increasing to 100% at 2.5 V and remaining at full output above that point in the plotted range. Use the specified ON/OFF thresholds; the HWB three-in-one curves describe a different function suffix.

Protection and Operating Conditions

Parameter Specification
Short circuit / overcurrent Short-circuit current is regulated at rated output current. The catalog permits continued short-circuit operation and specifies automatic recovery after the fault is removed; the feature list includes overcurrent protection.
Overtemperature Main control IC1 detects a typical junction temperature of 150°C. The unit shuts down and automatically recovers after temperature decreases. This is an IC junction threshold, not an ambient limit.
Ambient temperature -40 to +55°C at full load according to the model-specific curve. The 250-700 mA curve shows full-load operation through 55°C.
Case temperature 90°C maximum operating case temperature; keep this separate from ambient and IC-junction temperatures.
Cooling Free-air convection. Arrange the installation so the catalog temperature limits are met.
Operating humidity 20-90% RH, non-condensing.
Storage -55 to +125°C; 10-95% RH.
Temperature coefficient ±0.03%/°C.
Vibration 10-500 Hz, 2G; 10 minutes per cycle and 60 minutes each along X, Y and Z axes.
MTBF 650,000 hours minimum by MIL-HDBK-217F at 25°C. This reliability calculation is not a guaranteed service lifetime.

Mechanical Details and Wiring

Parameter Specification
Module dimensions 47 × 12 × 7 mm (L × W × H), excluding leads.
Case and encapsulation 94V-0 flame-retardant plastic case with full encapsulation; the specification lists UL94-V0 epoxy potting.
Wire specification All wires: UL3385, 22 AWG, rated 300 V / 105°C.
Input lead dimensions The mechanical drawing shows a 50 ±10 mm input lead and 3 ±1 mm stripped end.
Output lead dimensions The mechanical drawing shows a 150 ±10 mm output lead and 3 ±1 mm stripped end; it does not separately dimension the DIM lead lengths.
Position 1: -Vin Black DC-input return. Do not connect -Vin to -Vout.
Position 2: +Vin Red, DC supply positive.
Position 3: DIM(-) Black control return; connect to -Vin.
Position 4: DIM(+) White control lead for remote ON/OFF control.
Position 5: +Vout Yellow, LED positive connection.
Position 6: -Vout Blue, LED negative connection.
Connection restriction Do not connect the output to the input of the same unit or to the output of another power source. Keep input and LED-output polarity and return wiring distinct.
Per-unit mass 9.5 g, catalog packing reference for the HW version; this is not an independently measured shipment weight.

Standards and Catalog References

Parameter Specification
Listed approval EAC TP TC 020/2011 approved, as stated in the catalog.
EMC emission Compliance with BS EN/EN55015 and EAC TP TC 020.
EMC immunity Compliance with BS EN/EN61000-4-2, -3, -4, -6 and -8; light-industry level, criteria A, and EAC TP TC 020.
Catalog warranty reference The manufacturer catalog lists a 5-year warranty; applicable warranty terms govern.
Catalog location LDDS-H specification dated 2024-08-02, pages 10-15 of the linked combined catalog.

MEAN WELL LDDS-H series: DC/DC constant-current step-down LED driver - LDDS-250HW

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MEAN WELL LDDS-250HW DC/DC LED Driver MEAN WELL LDDS-250HW is an LDDS-H series DC/DC constant-current step-down LED driver with 250... Read more

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    Description

    MEAN WELL LDDS-250HW DC/DC LED Driver

    MEAN WELL LDDS-250HW is an LDDS-H series DC/DC constant-current step-down LED driver with 250 mA rated output and remote ON/OFF control. It accepts 12-56 VDC and drives a 2-45 VDC LED string subject to the catalog's 4 V input-to-output headroom requirement. This wire-style, fully encapsulated module is intended for DC battery, commercial, portable, track and landscape lighting applications.

    Download MEAN WELL LDDS-H Datasheet (PDF)

    Model Selection

    Parameter Specification
    Series and current code LDDS-H; 250 denotes the rated 250 mA output. The family offers fixed current ratings of 250, 300, 350, 500, 700 and 1000 mA.
    W and function suffix W denotes wire style. The blank function suffix denotes remote ON/OFF control; the separately ordered B version has three-in-one dimming.
    Application class The catalog describes Class III (SELV) lighting applications. Select an appropriate DC supply and verify the completed lighting system.
    Track-adapter application The catalog lists STUCCHI track-adapter applications. Confirm the actual mechanical fit, wiring and LED load; a track adapter is not identified as an included accessory.

    Output and Input

    Parameter Specification
    Rated output current 250 mA constant current.
    LED forward-voltage range 2-45 VDC. Maintain the catalog-specified 4 V step-down headroom from the DC input; input and LED-string voltage must be selected together.
    Power at the voltage limit 11.25 W at 45 V and 250 mA, calculated as V × I. This is subject to input headroom and temperature limits; the family-level 45 W description is not every model's output rating.
    Current accuracy ±5% typical at 48 VDC input (or 24 VDC).
    Ripple and noise 150 mVp-p maximum; measured with 20 MHz bandwidth using a 12-inch twisted pair terminated with a 0.1 µF capacitor.
    Switching frequency 40-1000 kHz; this is distinct from the external dimming-signal frequency.
    External capacitive load 2.2 µF maximum.
    DC input 12-56 VDC; nominal test input 48 VDC. Use DC supply connections as shown in the model wiring diagram.
    Efficiency 94% typical at 48 VDC input, 36 VDC output, without dimming. The series headline is up to 96%; the plotted efficiency also varies with LED-string voltage and input voltage.
    Input current 200 mA at full load under the 48 VDC input / 36 VDC output test condition; 6 mA at no load.
    Input filter Capacitor input filter and built-in EMI filtering.
    General test conditions Unless otherwise stated: normal 48 VDC input, rated load, 25°C ambient and 70% RH. The efficiency plots compare 24 V and 48 V input over different LED counts; they are not one efficiency guarantee for every load.

    Control Connections

    Parameter Specification
    Control reference Connect DIM(-) to -Vin. Control voltages are referenced to -Vin; leave the control input open when unused.
    ON/OFF thresholds ON: control voltage above 2.5 V up to 15 VDC, or open circuit. OFF: below 0.3 VDC, or shorted to -Vin. Observe the specific control curves for the ordered function suffix.
    Standard HW application curve The HW standard-application plot shows approximately 20% output at a 0.5 V control input, increasing to 100% at 2.5 V and remaining at full output above that point in the plotted range. Use the specified ON/OFF thresholds; the HWB three-in-one curves describe a different function suffix.

    Protection and Operating Conditions

    Parameter Specification
    Short circuit / overcurrent Short-circuit current is regulated at rated output current. The catalog permits continued short-circuit operation and specifies automatic recovery after the fault is removed; the feature list includes overcurrent protection.
    Overtemperature Main control IC1 detects a typical junction temperature of 150°C. The unit shuts down and automatically recovers after temperature decreases. This is an IC junction threshold, not an ambient limit.
    Ambient temperature -40 to +55°C at full load according to the model-specific curve. The 250-700 mA curve shows full-load operation through 55°C.
    Case temperature 90°C maximum operating case temperature; keep this separate from ambient and IC-junction temperatures.
    Cooling Free-air convection. Arrange the installation so the catalog temperature limits are met.
    Operating humidity 20-90% RH, non-condensing.
    Storage -55 to +125°C; 10-95% RH.
    Temperature coefficient ±0.03%/°C.
    Vibration 10-500 Hz, 2G; 10 minutes per cycle and 60 minutes each along X, Y and Z axes.
    MTBF 650,000 hours minimum by MIL-HDBK-217F at 25°C. This reliability calculation is not a guaranteed service lifetime.

    Mechanical Details and Wiring

    Parameter Specification
    Module dimensions 47 × 12 × 7 mm (L × W × H), excluding leads.
    Case and encapsulation 94V-0 flame-retardant plastic case with full encapsulation; the specification lists UL94-V0 epoxy potting.
    Wire specification All wires: UL3385, 22 AWG, rated 300 V / 105°C.
    Input lead dimensions The mechanical drawing shows a 50 ±10 mm input lead and 3 ±1 mm stripped end.
    Output lead dimensions The mechanical drawing shows a 150 ±10 mm output lead and 3 ±1 mm stripped end; it does not separately dimension the DIM lead lengths.
    Position 1: -Vin Black DC-input return. Do not connect -Vin to -Vout.
    Position 2: +Vin Red, DC supply positive.
    Position 3: DIM(-) Black control return; connect to -Vin.
    Position 4: DIM(+) White control lead for remote ON/OFF control.
    Position 5: +Vout Yellow, LED positive connection.
    Position 6: -Vout Blue, LED negative connection.
    Connection restriction Do not connect the output to the input of the same unit or to the output of another power source. Keep input and LED-output polarity and return wiring distinct.
    Per-unit mass 9.5 g, catalog packing reference for the HW version; this is not an independently measured shipment weight.

    Standards and Catalog References

    Parameter Specification
    Listed approval EAC TP TC 020/2011 approved, as stated in the catalog.
    EMC emission Compliance with BS EN/EN55015 and EAC TP TC 020.
    EMC immunity Compliance with BS EN/EN61000-4-2, -3, -4, -6 and -8; light-industry level, criteria A, and EAC TP TC 020.
    Catalog warranty reference The manufacturer catalog lists a 5-year warranty; applicable warranty terms govern.
    Catalog location LDDS-H specification dated 2024-08-02, pages 10-15 of the linked combined catalog.

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