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Mean Well

Mean Well LDB-350L DC/DC LED Driver CC 350mA - Buck-boost

contant currentbuck-boosthigh efficiency up to 91%pin style
SKU LDB-350L
$12.73 USD
Shipping calculated at checkout.
Available to order
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Overview

LDB-350L is the model of this series: typical efficiency 89%.

Features

  • DC/DC buck-boost converter
  • Constant current output: 300mA to 600mA
  • Wide input voltage: 9 ~ 36VDC
  • Wide output LED string voltage: 2 ~ 40VDC
  • High efficiency up to 91%
  • Comply with BS EN/EN55015 and FCC part15
  • Built-in PWM and remote ON/OFF control
  • Protections: Short circuit / Over temperature
  • Cooling by free air convection
  • Fully encapsulated with IP67 level
  • Compact size
  • High reliability
  • Suitable for driving illumination LED
  • 3 years warranty

Specifications

LDB-350LSpecifications from the official datasheet (2024-08-02 edition)

OUTPUT

CURRENT RANGE
350mA
VOLTAGE RANGENote.4
2 ~ 40VDC
CURRENT ACCURACY (Typ.)
±5%
RIPPLE & NOISE(max.)Note.2
150mVp-p
SWITCHING FREQENCY
1000KHz
NO LOAD OUTPUT VOLTAGE
75VDC

INPUT

VOLTAGE RANGENote.4
9 ~ 36VDC
EFFICIENCY (max.) 12VDC
89%
EFFICIENCY (max.) 24VDC
91%
DC CURRENT Full load 12VDC
1100mA
DC CURRENT Full load 24VDC
520mA
DC CURRENT No load
2mA (Vin 24VDC)
FILTER
Capacitor

PWM DIMMING & ON/OFF CONTROL

REMOTE ON/OFF
Leave open if not use Power ON with dimming: DIM ~ -Vin >2 ~ 10VDC or open circuit Power OFF : DIM ~ -Vin < 0.5VDC or short
PWM FREQUENCY
100 ~ 1KHz
MAX. PWM SIGNAL CURRENT
1mA

PROTECTION

SHORT CIRCUIT
Regulated at rated output current Protection type: Can be continued, recovers automatically after fault condition is removed
OVER TEMPERATURE
Tj 145℃ typically(IC1) detect on main control IC Protection type : Shut down, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-40 ~ + 70℃(Refer to derating curve)
WORKING HUMIDITY
20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-55 ~ +125℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03% / ℃
VIBRATION
10 ~ 500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes
OPERATING CASE TEMP. (max.)
115℃

EMC

SAFETY STANDARDS
EAC TP TC 020/2011 approved
EMC EMISSION
Compliance to BS EN/EN55015, FCC part 15 class B, EAC TP TC 020
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2,3,4,6,8, light industry level, criteria A, EAC TP TC 020

OTHERS

MTBF
350Khrs min. MIL-HDBK-217F (25℃)
DIMENSION
31.8*20.3*12.2mm or 1.25"*0.8"*0.48" inch (L*W*H)
WEIGHT
LDB-L:15.6g(15pcs/Tube) ; LDB-LW:18g(20pcs/Box), Please order Base on MPQ
POTTING MATERIAL
Expoxy(UL94-V0)
Test conditions and notes4
  1. 1.All parameters are specified at normal input(24VDC), rated load, 25℃ 70% RH ambient.
  2. 2.Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1uf capacitor.
  3. 3.The output of LDB-L should not be connected to the input of the same unit or output from other sources.
  4. 4. If input voltage is 36V then the output voltage operating range had better <38V.

Technical drawings

LDB-350L Mechanical Specification
Mechanical Specification
LDB-350L Derating Curve
Derating Curve
LDB-350L Safe Operating Area
Safe Operating Area
LDB-350L PWM Dimming Control
PWM Dimming Control
LDB-350L Efficiency VS Output Voltage(Number
Efficiency VS Output Voltage(Number
LDB-350L Packing
Packing
LDB-350L Standard Tube Packing
Standard Tube Packing

Downloads

FAQ

Can I use the LDB-350L for higher-current LED downlights?

Yes, this model is intended for constant current LED loads at 350mA, which can suit downlight modules that need more current than a 300mA driver. It supports a 2-40V CC output range from a 9-36VDC input.

Is the LDB-350L suitable for small outdoor LED arrays?

It can be used for small outdoor LED arrays when the array is designed for 350mA constant current operation and fits within the 2-40V range. The IP67 waterproof rating and -40°C to +70°C operating range (refer to the derating curve) support exposed environments.

Can the LDB-350L be used for rugged signage module applications?

Yes, it is an IP67 waterproof constant current driver, so it fits signage module applications where moisture resistance matters and the LED load matches the driver output. Its buck-boost design also supports the listed 9-36VDC input range.

Would the LDB-350L work in compact LED products where space is limited?

Yes, this is a compact driver at 31.8 × 20.3 × 12.2 mm and 15.6 g, which helps in small LED product housings. It is still a constant current driver, so the LED load must be matched electrically rather than treated like a constant voltage device.

How do I know whether my LEDs will work with the LDB-350L?

The driver outputs constant current at 350mA, so compatibility depends on whether the LEDs are meant for constant current operation. Its CC output voltage range is 2-40V, and the number of LEDs depends on the forward voltage of each LED.

How does the LDB-350L compare with other LDB series drivers?

In the LDB-L series, LDB-300L and LDB-300LW are 300mA, 2-40V; LDB-350LW matches this model at 350mA, 2-40V; LDB-500L and LDB-500LW are 500mA, 2-32V; and LDB-600L and LDB-600LW are 600mA, 2-30V. The LDB-350L is the pin style 350mA version.

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Mean Well LDB-350L DC/DC LED Driver CC 350mA - Buck-boost
Mean Well

Mean Well LDB-350L DC/DC LED Driver CC 350mA - Buck-boost

$12.73 USD

LDB-350L is the model of this series: typical efficiency 89%.

Features

  • DC/DC buck-boost converter
  • Constant current output: 300mA to 600mA
  • Wide input voltage: 9 ~ 36VDC
  • Wide output LED string voltage: 2 ~ 40VDC
  • High efficiency up to 91%
  • Comply with BS EN/EN55015 and FCC part15
  • Built-in PWM and remote ON/OFF control
  • Protections: Short circuit / Over temperature
  • Cooling by free air convection
  • Fully encapsulated with IP67 level
  • Compact size
  • High reliability
  • Suitable for driving illumination LED
  • 3 years warranty
View product

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