MEAN WELL LDB-L series: buck-boost constant-current LED driver - LDB-350L

Description

LDB-350L buck-boost constant-current LED driver

MEAN WELL LDB-350L is a pin-mounted DC/DC buck-boost constant-current LED driver with 350 mA rated output. It accepts 9–36 VDC input and operates over a 2–40 VDC output range, subject to the input/output safe operating area. The fully encapsulated IP67 module supports PWM dimming and free-air convection cooling.

Download MEAN WELL LDB-L Datasheet (PDF)

Combined catalog pages 18–23; LDB-L revision 2024-08-02.

Model and electrical selection

Complete model / construction LDB-350L; LDB-L series. L identifies the pin-mounted form. Fully encapsulated with UL94-V0 epoxy potting; IP67-rated module.
Conversion / output current Buck-boost DC/DC conversion; 350 mA constant-current output. Output voltage may be above or below input within the specified safe operating area.
DC input / output range Input: 9–36 VDC. Output: 2–40 VDC. These ranges must be applied together with the safe-operating-area graph; maximum output voltage is not available at every input voltage.
Safe operating area At 9 VDC input, the illustrated upper output boundary is 27 V; at 12 VDC input, 36 V. Stay inside the shaded operating area shown on page 20. At 36 VDC input the manufacturer recommends output voltage below 38 V.
Current accuracy / ripple Typical current accuracy: ±5%. Maximum ripple and noise: 150 mVp-p, measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with a 0.1 µF capacitor.
Maximum efficiency specification 89% at 12 VDC input; 91% at 24 VDC input, from the EFFICIENCY (max.) table. The model curves show LED-load dependence; their example peaks do not replace the table values.
Typical full-load input current 1100 mA at 12 VDC input; 520 mA at 24 VDC input.
No-load input / output Typical no-load input current: 2 mA at 24 VDC input. No-load output voltage: 75 VDC.
Switching / input filter Typical switching frequency: 1000 kHz (1 MHz). Input filter type: capacitor.

PWM control and protection

PWM control PWM frequency: 100–1000 Hz. Maximum input signal current: 1 mA. Use DIM relative to −Vin.
Enable / disable levels Power ON: DIM voltage above 2 V and up to 10 VDC, or leave DIM open. Power OFF: DIM below 0.5 VDC, or short DIM to −Vin. Leave DIM open when unused.
PWM characteristic The page 21 waveform example uses a 5 V high level and 0 V low level. Output current follows the PWM pulses; the typical duty/current characteristic states ±4% tolerance. This is separate from the ±5% current-accuracy specification.
Short-circuit protection Regulates continuously at rated output current during a short circuit and recovers automatically after the fault is removed.
Overtemperature protection Typical trip temperature is Tj = 145°C at IC1, the main control IC. Output shuts down and recovers automatically after cooling. This is an IC junction temperature, not the permitted ambient temperature.

Operating environment

Cooling / working ambient Free-air convection. Shared working range: −40 to +70°C, subject to derating. For this 350 mA model, use a full-load ambient limit of +70°C and keep within the safe operating area.
Case temperature Maximum case temperature: +115°C. Ambient and case limits must both be met.
Humidity / storage Working humidity: 20–90% RH, non-condensing. Storage: −55 to +125°C; 10–95% RH.
Temperature coefficient ±0.03%/°C.
Vibration 10–500 Hz, 2G; 10 minutes per cycle, 60 minutes along each of the X, Y and Z axes.

Connections and mechanical installation

Dimensions 31.8 × 20.3 × 12.2 mm (L × W × H).
Input / LED / control connections Bottom-view pins: 1 and 2 = −Vin; 11 and 12 = −Vout; 13 and 14 = +Vout; 21 = PWM DIM; 23 and 24 = +Vin. Follow the bottom-view drawing for physical pin locations.
Wire / pin geometry Pin diameter 0.60 mm; stated pin tolerance ±0.05 mm; side view shows 3.81 mm pin projection. Use the full mechanical drawing for board spacing.
Wiring boundaries Keep −Vin and −Vout separate. Do not connect this module’s output to its own input or to the output of another power source. Observe input polarity and LED polarity.
Load selection Select the LED-string voltage and current within this model’s safe operating area. Use the model-specific efficiency curves for the intended LED load and input voltage.

Installation guidance

DC input and output separation Use the model-specific DC input range and pin or lead-wire diagram. Do not connect -Vin to -Vout. Do not connect this unit's output to its own input or to the output of another power source.
PWM reference and unused input Apply the PWM/remote-control signal between DIM and -Vin. Leave DIM open when it is not used. PWM frequency is 100-1000 Hz and maximum PWM signal current is 1 mA.
PWM switching thresholds The catalogue specifies ON at greater than 2 V up to 10 V, or with the control input open; OFF is below 0.5 V or shorted to -Vin.
Installation reference scope Follow the LDB-specific input/output limits and application diagram. The catalogue points to the manufacturer's installation-manual index; no LDH, AC-input LED-driver or other DC-converter-family wiring instructions are substituted for this model.

Standards and reference data

Catalog safety / EMC references EAC TP TC 020/2011 is listed. Emission: BS EN/EN 55015, FCC Part 15 Class B, EAC TP TC 020. Immunity: BS EN/EN 61000-4-2, -3, -4, -6 and -8, light-industry level, criteria A.
MTBF 350 thousand hours minimum, MIL-HDBK-217F at 25°C.
Catalog unit mass 15.6 g, explicitly listed in the WEIGHT field for the pin-mounted form. This is a catalog unit reference, not a measured shipping-package weight.
Manufacturer warranty The catalog states a 3-year manufacturer warranty, subject to the manufacturer’s terms.
Measurement conditions Unless otherwise stated: normal 24 VDC input, rated load, 25°C and 70% RH ambient. Typical values and plotted examples retain their stated test conditions.

MEAN WELL LDB-L series: buck-boost constant-current LED driver - LDB-350L

Product form

LDB-350L buck-boost constant-current LED driver MEAN WELL LDB-350L is a pin-mounted DC/DC buck-boost constant-current LED driver with 350 mA rated... Read more

$24.64 Incl. VAT

    • Guaranteed secure & safe checkout.

      shop pay

    Description

    LDB-350L buck-boost constant-current LED driver

    MEAN WELL LDB-350L is a pin-mounted DC/DC buck-boost constant-current LED driver with 350 mA rated output. It accepts 9–36 VDC input and operates over a 2–40 VDC output range, subject to the input/output safe operating area. The fully encapsulated IP67 module supports PWM dimming and free-air convection cooling.

    Download MEAN WELL LDB-L Datasheet (PDF)

    Combined catalog pages 18–23; LDB-L revision 2024-08-02.

    Model and electrical selection

    Complete model / construction LDB-350L; LDB-L series. L identifies the pin-mounted form. Fully encapsulated with UL94-V0 epoxy potting; IP67-rated module.
    Conversion / output current Buck-boost DC/DC conversion; 350 mA constant-current output. Output voltage may be above or below input within the specified safe operating area.
    DC input / output range Input: 9–36 VDC. Output: 2–40 VDC. These ranges must be applied together with the safe-operating-area graph; maximum output voltage is not available at every input voltage.
    Safe operating area At 9 VDC input, the illustrated upper output boundary is 27 V; at 12 VDC input, 36 V. Stay inside the shaded operating area shown on page 20. At 36 VDC input the manufacturer recommends output voltage below 38 V.
    Current accuracy / ripple Typical current accuracy: ±5%. Maximum ripple and noise: 150 mVp-p, measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with a 0.1 µF capacitor.
    Maximum efficiency specification 89% at 12 VDC input; 91% at 24 VDC input, from the EFFICIENCY (max.) table. The model curves show LED-load dependence; their example peaks do not replace the table values.
    Typical full-load input current 1100 mA at 12 VDC input; 520 mA at 24 VDC input.
    No-load input / output Typical no-load input current: 2 mA at 24 VDC input. No-load output voltage: 75 VDC.
    Switching / input filter Typical switching frequency: 1000 kHz (1 MHz). Input filter type: capacitor.

    PWM control and protection

    PWM control PWM frequency: 100–1000 Hz. Maximum input signal current: 1 mA. Use DIM relative to −Vin.
    Enable / disable levels Power ON: DIM voltage above 2 V and up to 10 VDC, or leave DIM open. Power OFF: DIM below 0.5 VDC, or short DIM to −Vin. Leave DIM open when unused.
    PWM characteristic The page 21 waveform example uses a 5 V high level and 0 V low level. Output current follows the PWM pulses; the typical duty/current characteristic states ±4% tolerance. This is separate from the ±5% current-accuracy specification.
    Short-circuit protection Regulates continuously at rated output current during a short circuit and recovers automatically after the fault is removed.
    Overtemperature protection Typical trip temperature is Tj = 145°C at IC1, the main control IC. Output shuts down and recovers automatically after cooling. This is an IC junction temperature, not the permitted ambient temperature.

    Operating environment

    Cooling / working ambient Free-air convection. Shared working range: −40 to +70°C, subject to derating. For this 350 mA model, use a full-load ambient limit of +70°C and keep within the safe operating area.
    Case temperature Maximum case temperature: +115°C. Ambient and case limits must both be met.
    Humidity / storage Working humidity: 20–90% RH, non-condensing. Storage: −55 to +125°C; 10–95% RH.
    Temperature coefficient ±0.03%/°C.
    Vibration 10–500 Hz, 2G; 10 minutes per cycle, 60 minutes along each of the X, Y and Z axes.

    Connections and mechanical installation

    Dimensions 31.8 × 20.3 × 12.2 mm (L × W × H).
    Input / LED / control connections Bottom-view pins: 1 and 2 = −Vin; 11 and 12 = −Vout; 13 and 14 = +Vout; 21 = PWM DIM; 23 and 24 = +Vin. Follow the bottom-view drawing for physical pin locations.
    Wire / pin geometry Pin diameter 0.60 mm; stated pin tolerance ±0.05 mm; side view shows 3.81 mm pin projection. Use the full mechanical drawing for board spacing.
    Wiring boundaries Keep −Vin and −Vout separate. Do not connect this module’s output to its own input or to the output of another power source. Observe input polarity and LED polarity.
    Load selection Select the LED-string voltage and current within this model’s safe operating area. Use the model-specific efficiency curves for the intended LED load and input voltage.

    Installation guidance

    DC input and output separation Use the model-specific DC input range and pin or lead-wire diagram. Do not connect -Vin to -Vout. Do not connect this unit's output to its own input or to the output of another power source.
    PWM reference and unused input Apply the PWM/remote-control signal between DIM and -Vin. Leave DIM open when it is not used. PWM frequency is 100-1000 Hz and maximum PWM signal current is 1 mA.
    PWM switching thresholds The catalogue specifies ON at greater than 2 V up to 10 V, or with the control input open; OFF is below 0.5 V or shorted to -Vin.
    Installation reference scope Follow the LDB-specific input/output limits and application diagram. The catalogue points to the manufacturer's installation-manual index; no LDH, AC-input LED-driver or other DC-converter-family wiring instructions are substituted for this model.

    Standards and reference data

    Catalog safety / EMC references EAC TP TC 020/2011 is listed. Emission: BS EN/EN 55015, FCC Part 15 Class B, EAC TP TC 020. Immunity: BS EN/EN 61000-4-2, -3, -4, -6 and -8, light-industry level, criteria A.
    MTBF 350 thousand hours minimum, MIL-HDBK-217F at 25°C.
    Catalog unit mass 15.6 g, explicitly listed in the WEIGHT field for the pin-mounted form. This is a catalog unit reference, not a measured shipping-package weight.
    Manufacturer warranty The catalog states a 3-year manufacturer warranty, subject to the manufacturer’s terms.
    Measurement conditions Unless otherwise stated: normal 24 VDC input, rated load, 25°C and 70% RH ambient. Typical values and plotted examples retain their stated test conditions.

    Recently viewed products

      Footer image

      © 2026 MEAN WELL, ,

      • US (USD $) US (USD $)
      • Ach Direct Debit
      • AliPay
      • Amazon
      • American Express
      • Apple Pay
      • Diners Club
      • Discover
      • Google Pay
      • Mastercard
      • PayPal
      • Shop Pay
      • USDC
      • Visa