MEAN WELL LDH-25 series: step-up constant-current LED driver - LDH-25-700W

Description

LDH-25-700W step-up constant-current LED driver

MEAN WELL LDH-25-700W is a lead-wire DC/DC step-up constant-current LED driver with 700 mA output and 25.2 W catalog rated power. Its output-voltage range is 12.5–36 VDC, subject to the required voltage difference above the 9.5–32 VDC input. It provides 0–10 V or PWM dimming for DC-source LED lighting.

Download MEAN WELL LDH-25 Datasheet (PDF)

Combined catalog pages 1–6; LDH-25 revision 2024-10-16.

Output and input selection

Complete model LDH-25-700W
Model code / construction LDH-25 identifies the driver series; the current code is in mA. W selects the lead-wire form. Fully encapsulated, silicone-potted construction in a UL94-V0 flame-retardant plastic case.
Conversion / load type Step-up DC/DC conversion with constant-current output. Connect the driver directly to an LED string; the catalog does not recommend using additional drivers on its output.
Rated current / power 700 mA / 25.2 W. The series number is not a substitute for this model’s actual output rating.
Output operating range 12.5–36 VDC. Without dimming, output voltage must be at least 3 V above DC input. With dimming, output voltage must be at least twice the DC input voltage. Apply both the model voltage range and this input/output relationship.
DC input 9.5–32 VDC. When input is below 11 V, output current can fall below the rated value; consult the static-characteristic curve and allow for cable voltage drop.
Typical current accuracy / ripple Accuracy: ±5% at 12 VDC and 24 VDC input. Current ripple: 5% at rated current.
Typical efficiency 92.5% at 12 VDC input; 95.5% at 24 VDC input. Efficiency varies with the LED-string voltage/load; use the model-specific curves for the selected LED forward voltage.
Typical input current 2.5 A at 12 VDC; 1.2 A at 24 VDC.
Typical shutdown input current 7 mA at 12 VDC input with PWM dimming OFF.
Open-load / overvoltage behavior Overvoltage range: 37–60 V. At no load the output rises to the overvoltage threshold, then drops to approximately the input voltage; re-power to recover.
Output short-circuit warning Do not short the output. The detailed specification warns that an output short circuit will damage the power supply; do not rely on automatic short-circuit recovery.

Dimming and connection limits

Dimming input Apply 0–10 VDC or a 10 V PWM signal at 1–3 kHz between DIM+ and DIM−. Leave the dimming input open when unused.
Dimming limits The minimum defined dimming level is about 8%. Output current between 0% and 8% is not defined by the catalog.
Dim-off / residual output At approximately 0 VDC dimming input, or 0% duty cycle of the 10 V PWM signal, output voltage is approximately equal to input voltage. Complete darkness requires an LED string that remains off at that residual input-voltage level.
Dimming wiring Do not connect DIM− to Vout−. Observe the separate dimming terminals and output wiring shown in this model’s connection drawing.

Operating environment and derating

Cooling / ambient temperature Free-air convection; −40 to +70°C, subject to the thermal and input-voltage derating curves.
Thermal derating At 12–18 VDC input, the 100% load curve extends to +60°C; at 18–32 VDC input it extends to +70°C. Observe the separate plotted boundaries; the graph does not specify a sloped extension beyond them.
Input-voltage derating The plotted load is 75% at 9.5 VDC, rising to 100% at 12 VDC; 100% from 12 to 32 VDC. Observe the output-voltage and temperature limits at the same time.
Working humidity 20–90% RH, non-condensing.
Storage temperature / humidity −40 to +85°C; 10–95% RH.
Temperature coefficient ±0.03%/°C over 0–50°C.
Vibration 10–500 Hz, 2G; 10 minutes per cycle, 60 minutes along each of the X, Y and Z axes.
Altitude derating For this fanless design, reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m altitude.
Lifetime / warranty Typical lifetime greater than 35,000 hours when the marked case-temperature point tc is about 80°C or lower. The catalog states a 3-year manufacturer warranty; warranty conditions remain those of the manufacturer.

Mechanical installation and EMC

Dimensions 52.4 × 27.2 × 24 mm (L × W × H); drawing tolerance ±1 mm.
Input / output / dimming connections Wire positions: 1 Vin+ red; 2 Vin− black; 3 DIM+ blue; 4 DIM− white; 5 Vout− black; 6 Vout+ red.
Lead / pin geometry Lead length 100 ±10 mm; 8 mm stripped ends, as shown in the wiring drawing.
Polarity and return wiring Observe input and LED polarity. Do not apply negative/reversed input voltage, and do not connect Vin− to Vout−; the catalog warns of damage from incorrect polarity.
Input cable sizing Account for the DC input current and wiring voltage drop so that the voltage at the module remains within its operating limits.
Soldering limits Wave soldering: 265°C for 5 seconds maximum. Manual soldering: 390°C for 3 seconds maximum.
DC-source EMC selection With a battery DC source, the catalog states BS EN/EN 55015 compliance without an additional input filter and capacitors. For a DC-bus source, follow the page 6 filter circuit: C1 = 100 µF / 35 V; LF1 common-mode choke = 11.5 mH. Its reference core is T16 × 12 × 8 mm, Mn-Zn, permeability 10000 ±30%, AL = 4600 nH/N²; winding reference 0.6 mm × 1 wire, 50 turns. Select and verify components for the complete installation.
Applications DC battery-source lighting, portable lighting, solar LED street lighting, greenhouse lighting and low-bay LED lighting, within the model operating limits.

Installation guidance

DC input polarity and wiring drop Connect the positive and negative DC input terminals correctly. Do not apply a negative input voltage. Account for voltage drop in the input wiring because the input current can be high.
Input and output separation Do not connect Vin- to Vout-. Follow the pin or lead-wire diagram for this exact model; identical wire colors do not make the input and output negative connections interchangeable.
Dim-off output voltage When dimmed off, the output voltage falls to approximately the input voltage. Complete darkness requires an LED string that remains off at that input voltage; dim-off is not a zero-output-voltage isolation state.
Battery and DC-bus EMC The catalogue states battery-source compliance with BS EN/EN 55015 without additional input filters or capacitors. A DC-bus source requires the model-specific additional EMC filter circuit shown in the catalogue.
Installation reference scope The catalogue links the general LED installation manual, whose family list does not explicitly name LDH. Use this DC model's specific pinout and application limits; the general manual does not establish AC wiring or circuit-breaker ratings for this unit.
Short-circuit limitation The specification states that an output short circuit will damage the power supply. Do not treat the feature-page protection heading as a recoverable short-circuit guarantee.
Dimming connection boundary Connect LEDs directly; do not add a further driver at the output. Do not connect DIM- to Vo-. Leave unused dimming connections open. The minimum defined dimming level is about 8%; output current between 0% and 8% is undefined.
Output headroom For operation without dimming, the output must be at least 3 V above the DC input. For dimming operation, the catalogue requires the output voltage to be twice the input voltage.

Standards and reference data

Safety references LVD BS EN/EN 61347-1, BS EN/EN 61347-2-13 and EAC TP TC 004, as listed in the catalog.
EMC emission BS EN/EN 55015 and EAC TP TC 020. The stated EMI test layout uses a battery DC source; a DC-bus installation requires the additional filter network described above.
EMC immunity BS EN/EN 61547 and BS EN/EN 61000-4-2, -3, -4, -6 and -8; light-industry level; EAC TP TC 020.
MTBF 12369.5 thousand hours minimum, Telcordia TR/SR-332 (Bellcore); 896.4 thousand hours minimum, MIL-HDBK-217F at 25°C.
Catalog unit mass 57 g for this lead-wire version, explicitly listed in the PACKING field. This is the per-unit catalog reference, not a measured shipping-package weight.
Measurement conditions Unless stated otherwise: 12 VDC input, rated load, 25°C and 70% RH ambient. Typical values are not guarantees across all operating conditions.
Download MEAN WELL LED Installation Manual (Catalog Reference)

MEAN WELL LDH-25 series: step-up constant-current LED driver - LDH-25-700W

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LDH-25-700W step-up constant-current LED driver MEAN WELL LDH-25-700W is a lead-wire DC/DC step-up constant-current LED driver with 700 mA output... Read more

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    Description

    LDH-25-700W step-up constant-current LED driver

    MEAN WELL LDH-25-700W is a lead-wire DC/DC step-up constant-current LED driver with 700 mA output and 25.2 W catalog rated power. Its output-voltage range is 12.5–36 VDC, subject to the required voltage difference above the 9.5–32 VDC input. It provides 0–10 V or PWM dimming for DC-source LED lighting.

    Download MEAN WELL LDH-25 Datasheet (PDF)

    Combined catalog pages 1–6; LDH-25 revision 2024-10-16.

    Output and input selection

    Complete model LDH-25-700W
    Model code / construction LDH-25 identifies the driver series; the current code is in mA. W selects the lead-wire form. Fully encapsulated, silicone-potted construction in a UL94-V0 flame-retardant plastic case.
    Conversion / load type Step-up DC/DC conversion with constant-current output. Connect the driver directly to an LED string; the catalog does not recommend using additional drivers on its output.
    Rated current / power 700 mA / 25.2 W. The series number is not a substitute for this model’s actual output rating.
    Output operating range 12.5–36 VDC. Without dimming, output voltage must be at least 3 V above DC input. With dimming, output voltage must be at least twice the DC input voltage. Apply both the model voltage range and this input/output relationship.
    DC input 9.5–32 VDC. When input is below 11 V, output current can fall below the rated value; consult the static-characteristic curve and allow for cable voltage drop.
    Typical current accuracy / ripple Accuracy: ±5% at 12 VDC and 24 VDC input. Current ripple: 5% at rated current.
    Typical efficiency 92.5% at 12 VDC input; 95.5% at 24 VDC input. Efficiency varies with the LED-string voltage/load; use the model-specific curves for the selected LED forward voltage.
    Typical input current 2.5 A at 12 VDC; 1.2 A at 24 VDC.
    Typical shutdown input current 7 mA at 12 VDC input with PWM dimming OFF.
    Open-load / overvoltage behavior Overvoltage range: 37–60 V. At no load the output rises to the overvoltage threshold, then drops to approximately the input voltage; re-power to recover.
    Output short-circuit warning Do not short the output. The detailed specification warns that an output short circuit will damage the power supply; do not rely on automatic short-circuit recovery.

    Dimming and connection limits

    Dimming input Apply 0–10 VDC or a 10 V PWM signal at 1–3 kHz between DIM+ and DIM−. Leave the dimming input open when unused.
    Dimming limits The minimum defined dimming level is about 8%. Output current between 0% and 8% is not defined by the catalog.
    Dim-off / residual output At approximately 0 VDC dimming input, or 0% duty cycle of the 10 V PWM signal, output voltage is approximately equal to input voltage. Complete darkness requires an LED string that remains off at that residual input-voltage level.
    Dimming wiring Do not connect DIM− to Vout−. Observe the separate dimming terminals and output wiring shown in this model’s connection drawing.

    Operating environment and derating

    Cooling / ambient temperature Free-air convection; −40 to +70°C, subject to the thermal and input-voltage derating curves.
    Thermal derating At 12–18 VDC input, the 100% load curve extends to +60°C; at 18–32 VDC input it extends to +70°C. Observe the separate plotted boundaries; the graph does not specify a sloped extension beyond them.
    Input-voltage derating The plotted load is 75% at 9.5 VDC, rising to 100% at 12 VDC; 100% from 12 to 32 VDC. Observe the output-voltage and temperature limits at the same time.
    Working humidity 20–90% RH, non-condensing.
    Storage temperature / humidity −40 to +85°C; 10–95% RH.
    Temperature coefficient ±0.03%/°C over 0–50°C.
    Vibration 10–500 Hz, 2G; 10 minutes per cycle, 60 minutes along each of the X, Y and Z axes.
    Altitude derating For this fanless design, reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m altitude.
    Lifetime / warranty Typical lifetime greater than 35,000 hours when the marked case-temperature point tc is about 80°C or lower. The catalog states a 3-year manufacturer warranty; warranty conditions remain those of the manufacturer.

    Mechanical installation and EMC

    Dimensions 52.4 × 27.2 × 24 mm (L × W × H); drawing tolerance ±1 mm.
    Input / output / dimming connections Wire positions: 1 Vin+ red; 2 Vin− black; 3 DIM+ blue; 4 DIM− white; 5 Vout− black; 6 Vout+ red.
    Lead / pin geometry Lead length 100 ±10 mm; 8 mm stripped ends, as shown in the wiring drawing.
    Polarity and return wiring Observe input and LED polarity. Do not apply negative/reversed input voltage, and do not connect Vin− to Vout−; the catalog warns of damage from incorrect polarity.
    Input cable sizing Account for the DC input current and wiring voltage drop so that the voltage at the module remains within its operating limits.
    Soldering limits Wave soldering: 265°C for 5 seconds maximum. Manual soldering: 390°C for 3 seconds maximum.
    DC-source EMC selection With a battery DC source, the catalog states BS EN/EN 55015 compliance without an additional input filter and capacitors. For a DC-bus source, follow the page 6 filter circuit: C1 = 100 µF / 35 V; LF1 common-mode choke = 11.5 mH. Its reference core is T16 × 12 × 8 mm, Mn-Zn, permeability 10000 ±30%, AL = 4600 nH/N²; winding reference 0.6 mm × 1 wire, 50 turns. Select and verify components for the complete installation.
    Applications DC battery-source lighting, portable lighting, solar LED street lighting, greenhouse lighting and low-bay LED lighting, within the model operating limits.

    Installation guidance

    DC input polarity and wiring drop Connect the positive and negative DC input terminals correctly. Do not apply a negative input voltage. Account for voltage drop in the input wiring because the input current can be high.
    Input and output separation Do not connect Vin- to Vout-. Follow the pin or lead-wire diagram for this exact model; identical wire colors do not make the input and output negative connections interchangeable.
    Dim-off output voltage When dimmed off, the output voltage falls to approximately the input voltage. Complete darkness requires an LED string that remains off at that input voltage; dim-off is not a zero-output-voltage isolation state.
    Battery and DC-bus EMC The catalogue states battery-source compliance with BS EN/EN 55015 without additional input filters or capacitors. A DC-bus source requires the model-specific additional EMC filter circuit shown in the catalogue.
    Installation reference scope The catalogue links the general LED installation manual, whose family list does not explicitly name LDH. Use this DC model's specific pinout and application limits; the general manual does not establish AC wiring or circuit-breaker ratings for this unit.
    Short-circuit limitation The specification states that an output short circuit will damage the power supply. Do not treat the feature-page protection heading as a recoverable short-circuit guarantee.
    Dimming connection boundary Connect LEDs directly; do not add a further driver at the output. Do not connect DIM- to Vo-. Leave unused dimming connections open. The minimum defined dimming level is about 8%; output current between 0% and 8% is undefined.
    Output headroom For operation without dimming, the output must be at least 3 V above the DC input. For dimming operation, the catalogue requires the output voltage to be twice the input voltage.

    Standards and reference data

    Safety references LVD BS EN/EN 61347-1, BS EN/EN 61347-2-13 and EAC TP TC 004, as listed in the catalog.
    EMC emission BS EN/EN 55015 and EAC TP TC 020. The stated EMI test layout uses a battery DC source; a DC-bus installation requires the additional filter network described above.
    EMC immunity BS EN/EN 61547 and BS EN/EN 61000-4-2, -3, -4, -6 and -8; light-industry level; EAC TP TC 020.
    MTBF 12369.5 thousand hours minimum, Telcordia TR/SR-332 (Bellcore); 896.4 thousand hours minimum, MIL-HDBK-217F at 25°C.
    Catalog unit mass 57 g for this lead-wire version, explicitly listed in the PACKING field. This is the per-unit catalog reference, not a measured shipping-package weight.
    Measurement conditions Unless stated otherwise: 12 VDC input, rated load, 25°C and 70% RH ambient. Typical values are not guarantees across all operating conditions.
    Download MEAN WELL LED Installation Manual (Catalog Reference)

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