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Mean Well LDH DC/DC LED Driver CC 250mA - Step-up

Name: Mean Well LDH DC/DC LED Driver CC 250mA - Step-up
Brand: Mean Well
SKU: LDH-25-250
Price: 11.13 USD
Availability: InStock

constant currentstep uphigh efficiency up to 95%pin style

SKU LDH-25-250

$11.13 USD

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Available to order

Overview

LDH-25-250 is the model of this series: rated current 250mA, rated power 21W, 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-25-250Specifications from the official datasheet (2024-10-16 edition)

OUTPUT

RATED CURRENT: 250mA
CURRENT ACCURACY(Typ.): ±5% at 12VDC input and 24 VDC Input
VOLTAGE RANGE^Note.2: 12.5~84VDC
RATED POWER: 21W
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: 85~120V
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-25-250 Mechanical Specification — Mechanical Specification

LDH-25-250 Standard Application — Standard Application

LDH-25-250 Efficiency VS Load — Efficiency VS Load

LDH-25-250 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-25-250 Test Report PDF Download

FAQ

Can I use the LDH-25-250 for LED downlights that need a low constant current?

Yes, this driver is rated for 250 mA constant current output and is intended for LED loads that fall within its 12.5-84V constant current range. It is not a constant voltage driver, so it should be used with constant current downlight loads rather than constant voltage LED products.

Is the LDH-25-250 suitable for signage modules or small LED arrays?

It can suit signage modules or small LED arrays when the LEDs are designed for 250 mA constant current operation. The load must remain within the 12.5-84V constant current range, and the number of LEDs depends on the forward voltage of each LED.

Can this model be used when the input supply is lower than the LED load voltage?

Yes, the LDH-25-250 is a step-up constant current driver with a 9.5-32VDC input and up to 84V output. That makes it suitable for constant current LED loads where the required LED voltage is higher than the available input range.

How do I know if an LED load is compatible with the LDH-25-250?

The LED load must be designed for 250 mA constant current operation and must fall within the 12.5-84V constant current output range. The exact number of LEDs cannot be set from this driver alone because it depends on the forward voltage of each LED.

How does the LDH-25-250 compare with other LDH-25 models?

Within the LDH-25 family, the 250 and 250W models are 250 mA, 12.5-84V, 21W; the 350 and 350W models are 350 mA, 12.5-72V, 25.2W; the 500 and 500W models are 500 mA, 12.5-50V, 25W; and the 700 and 700W models are 700 mA, 12.5-36V, 25.2W. The non-W version is pin style, while the W version is wire style.

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