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Mean Well

Mean Well LDH-45A-350W DC/DC LED Driver CC 350mA - Step-up

constant currentstep uphigh efficiency up to 95%wire style
SKU LDH-45A-350W
$12.69 USD
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Overview

LDH-45A-350W is the model of this series: rated current 350mA, rated power 30.1W, typical efficiency 91%.

Features

  • DC/DC step-up converter
  • Constant current output : 350mA to 1050mA
  • Wide output LED string voltage up to 126VDC
  • High efficiency up to 95%
  • PWM + analog dimming and remote ON/OFF control [(Blank) type or W type]
  • DALI dimming [(Blank)DA type or WDA type]
  • Protections: Short circuit / Over voltage / Under voltage
  • Cooling by free air convection
  • Fully encapsulated
  • 3 years warranty

Specifications

LDH-45A-350WSpecifications from the official datasheet (2024-10-16 edition)

OUTPUT

RATED CURRENT
350mA
CURRENT ACCURACY(Typ.)
±5% at 12VDC input
VOLTAGE RANGE Non-DALINote.2
12~86VDC
VOLTAGE RANGE DALINote.2
24~86VDC
NO LOAD OUTPUT VOLTAGE(max.)
100V
RATED POWER
30.1W
RIPPLE & NOISE (max.)Note.3
2.5Vp-p

INPUT

RATED VOLTAGE
12VDC
VOLTAGE RANGENote.2
9~18VDC
EFFICIENCY (max.)
91%
DC CURRENT (Typ.)
2.8A

PWM DIMMING & ON/OFF CONTROL

REMOTE ON/OFF
Leave open if not used Power ON with dimming: PWM signal >2~8VDC or open circuit, between PWM DIM and DIM- Power OFF : PWM signal <0.5VDC or short or PWM duty is equal to 0%, between PWM DIM and DIM-
PWM DIMMING FREQUENCY
1K~10KHz
QUIESCENT INPUT CURRENT IN SHUTDOWN MODE(Typ.)
7mA when PWM dimming OFF

ANALOG DIMMING & ON/OFF CONTROL

REMOTE ON/OFF
Leave open if not used Power on with dimming: DC input >0.25~8VDC or open circuit, between Analog DIM and DIM- Power off : DC input <0.2VDC or short, between Analog DIM and DIM-
DIM INPUT VOLTAGE RANGE
0.25~1.3VDC
MAX OPERATION VOLTAGE
8V; The output current remains constant when voltage changes from 1.3V to 8V
QUIESCENT INPUT CURRENT IN SHUTDOWN MODE(Typ.)
7mA when Analog dimming OFF

PROTECTION

SHORT CIRCUIT
Protection type : Power OFF and fuse open
OVER VOLTAGE (max.)
100V Protection type : Constant output voltage and shut off o/p current, recovers automatically after fault condition is removed

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
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
12195.2K hrs min. Telcordia SR-332 (Bellcore) ; 1179.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
75*53*22.7mm (L*W*H)
PACKING
138g;100pcs/14.8Kg/0.83CUFT[(Blank) type or (Blank) DA type],1.04CUFT(W type or WDA type)
Test conditions and notes3
  1. 1. All parameters are specified at normal input(12VDC,24VDC), rated load, 25℃ 70% RH ambient.
  2. 2. (Blank) type and W type output voltage must step up by 3 Volts from input DC voltage; (Blank)DA type and WDA type output voltage must step up by 12 Volts from input DC voltage.
  3. 3. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf parallel capacitor.

Technical drawings

LDH-45A-350W Mechanical Specification
Mechanical Specification
LDH-45A-350W Standard Application
Standard Application
LDH-45A-350W Efficiency VS Output Voltage(Number
Efficiency VS Output Voltage(Number
LDH-45A-350W Application Notes of EMC
Application Notes of EMC

Downloads

FAQ

Can I use the LDH-45A-350W for 350mA LED downlights with a high forward-voltage string?

Yes, this driver is built for constant current LED loads at 350mA with a constant current output range of 12-86V. It can support LED downlights when the total forward voltage of the LEDs stays inside that range and the load stays within 30.1W. It is a constant current driver, so it is not the right match for fixed-voltage LED products.

Is this driver suitable for waterproof signage modules or small outdoor LED arrays?

It can be a fit for constant current signage modules or small LED arrays that require 350mA and operate within the 12-86V constant current range. The datasheet gives no IP or waterproof rating, so the module or housing must keep the driver dry; the operating temperature range is -40°C to +70°C (refer to the derating curve). The load still needs to stay within the 30.1W rating.

Can the LDH-45A-350W power a compact LED array from a low-voltage source?

Yes, it is a step-up constant current driver with a 350mA output and up to 86V output voltage. That makes it useful for small LED arrays that need a higher LED string voltage than the source side, as long as the array falls within 12-86V and 30.1W. This is for constant current LED loads rather than fixed-voltage lighting products.

How do I check whether my LED string is compatible with this 350mA driver?

The LED load must be rated for constant current operation at 350mA, and the total LED forward voltage must fall within the 12-86V constant current range. The number of LEDs depends on each LED's forward voltage, so there is no single fixed LED count for this model. The driver can deliver up to 86V output and 30.1W.

Is the LDH-45A-350W a good choice for harsh indoor or outdoor conditions?

It operates from -40°C to +70°C (refer to the derating curve) at 20-90% RH non-condensing, but no IP or waterproof rating is listed, so outdoors it needs a housing that keeps out water and dust. Its compact 75.0 × 53.0 × 22.7 mm size also helps in space-limited assemblies.

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Other LDH-45A Models

3 other models
ModelPowerVoltageCurrentIP Rating
Mean Well LDH-45A-350WDA DC/DC LED Driver CC 350mA - Step-up 30.1W 86V 0.35A IP67 View
Mean Well LDH-45A-350DA DC/DC LED Driver CC 350mA - Step-up 30.1W 86V 0.35A IP67 View
Mean Well LDH-45A-350 DC/DC LED Driver CC 350mA - Step-up 30.1W 86V 0.35A IP67 View
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Mean Well LDH-45A-350W DC/DC LED Driver CC 350mA - Step-up
Mean Well

Mean Well LDH-45A-350W DC/DC LED Driver CC 350mA - Step-up

$12.69 USD

LDH-45A-350W is the model of this series: rated current 350mA, rated power 30.1W, typical efficiency 91%.

Features

  • DC/DC step-up converter
  • Constant current output : 350mA to 1050mA
  • Wide output LED string voltage up to 126VDC
  • High efficiency up to 95%
  • PWM + analog dimming and remote ON/OFF control [(Blank) type or W type]
  • DALI dimming [(Blank)DA type or WDA type]
  • Protections: Short circuit / Over voltage / Under voltage
  • Cooling by free air convection
  • Fully encapsulated
  • 3 years warranty
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