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Mean Well LDH DC/DC LED Driver CC 500mA - Step-up

Name: Mean Well LDH DC/DC LED Driver CC 500mA - Step-up
Brand: Mean Well
SKU: LDH-25-500
Price: 11.13 USD
Availability: InStock

constant currentstep uphigh efficiency up to 95%pin style

SKU LDH-25-500

$11.13 USD

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Overview

LDH-25-500 is the model of this series: rated current 500mA, rated power 25W, typical efficiency 91.5%/12V 94%/24V.

LDH-25 series is a 25W DC/DC LED driver featuring constant current output. LDH-25 operates from 9.5～32VDC and offers models with different rated current ranging between 250mA and 700mA. With the high efficiency up to 95.5%, The 94V-0 flame retar-dant plastic case the fully-potted silicore e enhance the heat dissipation allows this series to fit solar LED street light. LDH-25 is equipped with various function options, such as dimming methodologies, so as to provide the optimal design flexibility for DC source LED lighting system.

Features

Wide DC input voltage operation 9.5~32V
DC/DC step-up converter
Constant current output : 250mA to 700mA
Wide output LED forward voltage up to 84V DC
High efficiency up to 95.5%
2 in 1 dimming (0-10V, PWM)
Protections: Short circuit / Over voltage
Cooling by free air convection
Fully encapsulated
3 years warranty

Specifications

LDH-25-500Specifications from the official datasheet (2024-10-16 edition)

OUTPUT

RATED CURRENT: 500mA
CURRENT ACCURACY(Typ.): ±5% at 12VDC input and 24 VDC Input
VOLTAGE RANGE^Note.2: 12.5~50VDC
RATED POWER: 25W
CURRENT RIPPLE: 5%(@rated current)

INPUT

VOLTAGE RANGE^Note.2: 9.5~32VDC
EFFICIENCY (Typ.): 91.5%/12V 94%/24V
DC CURRENT (Typ.): 2.5A/12VDC, 1.2A/24VDC

DIMMING

DIMMING FUNCTION^Note.2: Leave open if not used 1KHz-3KHz 10V PWM signal or 0-10V DC input
QUIESCENT INPUT CURRENT IN SHUTDOWN MODE(Typ.): 7mA when PWM dimming OFF @12VDC

PROTECTION

SHORT CIRCUIT: Output short circuit, the power supply will be damaged
OVER VOLTAGE: 51~80V
NO LOAD: Output voltage rise to OVP, and drop equal to input voltage, re-power to recovery

ENVIRONMENT

WORKING TEMP.: -40 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes
SOLDERING TEMPERATURE: Wave soldering: 265℃,5s (max.); Manual soldering: 390℃,3s (max.)

SAFETY & EMC

SAFETY STANDARDS: LVD BS EN/EN61347-1, BS EN/EN61347-2-13, EAC TP TC 004 approved
EMC EMISSION^Note.5: Compliance to BS EN/EN55015;EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61547,BS EN/EN61000-4-2,3,4,6,8; light industry level,EAC TP TC 020

OTHERS

MTBF: 12369.5K hrs min. Telcordia TR/SR-332(Bellcore); 896.4Khrs min. MIL-HDBK-217F (25℃)
DIMENSION: 52.4*27.2*24mm (L*W*H)
PACKING: Pin mounted style: 50g, 200pcs/11Kg/0.89CUFT; Lead wire style: 57g, 200pcs/12.4kg/0.98CUFT

Test conditions and notes5

1.All parameters are specified at normal input(12VDC), rated load, 25℃ 70% RH ambient.
2.Non dimming application: Output voltage must step up by 3 Volts from input DC voltage Dimming application: Output voltage must be twice higher than the input DC voltage If input voltage down below 11V, the output current may drop to more than 80% of the rated current
3.This series meets the typical life expectancy of >35,000 hours of operation when Tcase, particularly tc point (or TMP, per DLC), is about 80℃ or less.
4.The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
5.BS EN/EN55015 EMI testing layout is based on DC input with a battery source

Technical drawings

LDH-25-500 Mechanical Specification — Mechanical Specification

LDH-25-500 Standard Application — Standard Application

LDH-25-500 Efficiency VS Load — Efficiency VS Load

LDH-25-500 Application Notes of EMC — Application Notes of EMC

Typical applications

DC battery source lighting
Portable lighting
LED solar street lighting
LED greenhouse lighting
LED Low-bay lighting

Downloads

Certificates3

Mean Well LDH-25-LVD Certificate PDF Download

Mean Well LDH-25-CE-dec Certificate PDF Download

Mean Well LDH-25-UK-dec Certificate PDF Download

Test reports1

Mean Well LDH-25-500 Test Report PDF Download

FAQ

Can I use the LDH-25-500 for LED downlights that need a 500mA constant current driver?

Yes, if the downlight is designed for constant current operation at 500mA and its total LED forward voltage falls within the 12.5-50V constant current range. This model is a 25W step-up constant current driver, so it is intended for LED loads that need regulated current rather than a fixed constant voltage output.

Is the LDH-25-500 suitable for powering signage LED modules?

It can be suitable for signage modules only when the modules are built for 500mA constant current operation and the LED load stays within the 12.5-50V CC range. It is not the right choice for constant voltage signage products that expect a fixed voltage supply instead of a constant current driver.

Can this driver run a small custom LED array from a low-voltage source?

Yes, this is a step-up DC/DC constant current driver with a 9.5-32VDC input and a 12.5-50V constant current output range. It is intended for small LED arrays that require 500mA regulated current and up to 25W output.

How do I know if my LED load is compatible with the LDH-25-500?

Your LED load needs to be a constant current load rated for 500mA, and its combined forward voltage must fall within the 12.5-50V CC output range. The exact number of LEDs depends on the forward voltage of each LED, so compatibility should be checked by total LED forward voltage rather than by a fixed LED count.

Is the LDH-25-500 a good fit for high-temperature or low-temperature equipment?

It is rated for operation from -40°C to +70°C (refer to the derating curve), which supports use in equipment exposed to wide ambient temperature swings. That temperature range should still be evaluated together with the conditions inside the finished product.

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