Mean Well LDD-H Series
DC-DC Constant Current Step-Down LED Driver
Key Features
- DC/DC step-down converter
- Constant current output: 300mA to 1500mA
- Wide input voltage: 9 ~ 56VDC
- Wide output LED string voltage: 2 ~ 52VDC
- High efficiency up to 97%
- Built-in EMI filter, complies with EN55015 and FCC part15 without additional input filter and capacitors
- Built-in PWM and remote ON/OFF control
- Protections: Short circuit / Over temperature
- Cooling by free air convection
- Fully encapsulated with IP67 level for pin and wire style
- Non-potted, optional conformal coating for SMD style (Order No.: LDD-350-1000 HSC)
- Compact size
- Low cost, high reliability
- Suitable for driving illumination LED
- 3 years warranty
Specifications
Note: All parameters are specified at normal input (48VDC), rated load, 25°C 70% RH ambient, unless otherwise noted.
Note 2: Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1uF capacitor.
Note 3: Test condition: 48VDC input.
Note 4: Output voltage will always step down by 3 volts from input DC voltage.
Note 5: The output of LDD-H should not be connected to the input of the same unit or output from other sources.
| ORDER NO. | LDD-300H | LDD-350H | LDD-500H | LDD-600H | LDD-700H | LDD-1000H | LDD-1200H | LDD-1500HA | |
|---|---|---|---|---|---|---|---|---|---|
| CURRENT RANGE | 300mA | 350mA | 500mA | 600mA | 700mA | 1000mA | 1200mA | 1500mA | |
| OUTPUT VOLTAGE RANGE | Note.4 2~52VDC | 2~46VDC | |||||||
| CURRENT ACCURACY (Typ.) | ±3% at 24VDC input; ±4% at 48VDC input for LDD-H/HW; ±5% for LDD-HS | ||||||||
| RIPPLE & NOISE (max.) Note.2 | 150mVp-p | 150mVp-p | 150mVp-p | 200mVp-p | 200mVp-p | 350mVp-p | 350mVp-p | 350mVp-p | |
| SWITCHING FREQUENCY | 40KHz ~ 1000KHz | ||||||||
| EXTERNAL CAPACITANCE LOAD (max.) | 2.2uF | ||||||||
| INPUT VOLTAGE RANGE | 9~56VDC | 9~52VDC | |||||||
| EFFICIENCY (max.) | 97% at full load and 36VDC/48VDC input for LDD-H/HW; 96% at full load and 36VDC/48VDC input for LDD-HS | ||||||||
| DC CURRENT (Full load Note.3) | 270mA | 320mA | 450mA | 550mA | 650mA | 900mA | 1100mA | 1360mA | |
| DC CURRENT (No load) | 5mA | ||||||||
| FILTER | Capacitor | ||||||||
| PWM DIMMING & ON/OFF CONTROL | Leave open if not use | ||||||||
| REMOTE ON/OFF | Power ON with dimming: DIM ~ -Vin >2.5 ~ 6VDC or open circuit Power OFF: DIM ~ -Vin < 0.8VDC or short | ||||||||
| PWM FREQUENCY | 100 ~ 1KHz | ||||||||
| QUIESCENT INPUT CURRENT IN SHUTDOWN MODE(max.) | 1mA at PWM dimming OFF and 24VDC input | ||||||||
| SHORT CIRCUIT PROTECTION | Regulated at rated output current | ||||||||
| OVER TEMPERATURE PROTECTION | Protection type: Can be continued, recovers automatically after fault condition is removed Tj 150°C typically (IC1) detect on main control IC | ||||||||
| ENVIRONMENT WORKING TEMP. | -40 ~ +85°C (Refer to derating curve) | ||||||||
| WORKING HUMIDITY | 20% ~ 90% RH non-condensing for LDD-H/HW; 20%~85% RH non-condensing for LDD-HS | ||||||||
| STORAGE TEMP., HUMIDITY | -55 ~ +125°C, 10~95% RH | ||||||||
| TEMP. COEFFICIENT | ±0.03% / °C | ||||||||
| VIBRATION | 10~500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes | ||||||||
| OPERATING CASE TEMP. (max.) | 100°C | ||||||||
| SAFETY STANDARDS | EAC TP TC 004 approved | ||||||||
| EMC EMISSION | Compliance to EN55015, FCC part 15 class B, EAC TP TC 020 | ||||||||
| EMC IMMUNITY | Compliance to EN61000-4-2,3,4,6,8, light industry level, criteria A, EAC TP TC 020 | ||||||||
| MTBF | 1000Khrs min. MIL-HDBK-217F (25°C) | ||||||||
| DIMENSION | 31.8*20.3*12.2mm or 1.25"*0.8"*0.48" inch (L*W*H) for LDD-H/HW; 31.8*20.3*11.4mm or 1.25"*0.8"*0.45" inch (L*W*H) for LDD-HS | ||||||||
| WEIGHT | LDD-H:15.6g; LDD-HW:18g; LDD-HS:12.8g | ||||||||
| POTTING MATERIAL | Expoxy(UL94-V0) for LDD-H/HW; without potted for LDD-HS | ||||||||
Mechanical Specifications and Pin Configurations
Blank type (LDD-300~1000H)
Dimensions: 20.3mm [0.80"] (Length) x 15.24mm [0.60"] (Width) x 3.81mm [0.15"] (Height). Pin tolerance ±0.05mm.
Pin Configuration
| Pin No. | Function | Comment |
|---|---|---|
| 1,2 | -Vin | Don't connect to -Vout |
| 11,12 | -Vout | LED Connection |
| 13,14 | +Vout | LED + Connection |
| 22 | PWM DIM | ON/OFF and PWM Dimming (Leave open if not used) |
| 23,24 | +Vin | DC Supply |
| others | N.C | No connection |
Blank type (LDD-1200~1500H)
Dimensions: 20.3mm [0.80"] (Length) x 15.24mm [0.60"] (Width) x 3.81mm [0.15"] (Height). Pin tolerance ±0.05mm.
Pin Configuration
| Pin No. | Function | Comment |
|---|---|---|
| 1,2 | -Vin | Don't connect to -Vout |
| 11,12 | -Vout | LED Connection |
| 13,14 | +Vout | LED + Connection |
| 21 | PWM DIM | ON/OFF and PWM Dimming (Leave open if not used) |
| 23,24 | +Vin | DC Supply |
| others | N.C | No connection |
W type (LDD-300~1500HW)
Dimensions: 20.3mm [0.80"] (Length) x 12.2mm [0.48"] (Width) x 31.8mm [1.25"] (Height). Features wires: -Vin (Black), -Vout (Blue), +Vout (Yellow), PWM DIM (White), +Vin (Red). All wires are UL3385 22AWG.
Pin Configuration
| Pin No. | Function | Comment |
|---|---|---|
| 2 | -Vin | Don't connect to -Vout |
| 11 | -Vout | LED Connection |
| 14 | +Vout | LED + Connection |
| 21 | PWM DIM | ON/OFF and PWM Dimming (Leave open if not used) |
| 23 | +Vin | DC Supply |
| others | N.C | No connection |
S type (LDD-300~1000HS)
Dimensions: 25.4mm [1.00"] (Length) x 20.3mm [0.80"] (Width) x 31.8mm [1.25"] (Height). Note: Pin tolerance ±0.05mm.
Pin Configuration
| Pin No. | Function | Comment |
|---|---|---|
| 1,2 | -Vin | Don't connect to -Vout |
| 11,12 | -Vout | LED Connection |
| 13,14 | +Vout | LED + Connection |
| 21 | PWM DIM | ON/OFF and PWM Dimming (Leave open if not used) |
| 23,24 | +Vin | DC Supply |
| others | N.C | No connection |
Recommended PCB layout (for LDD-300~1000HS)
The PCB layout shows pin positions for top view. Key pin groupings include 24, 23, 21 on one side and 14, 13 on another, with 11, 12 grouped separately. Dimensions are provided for reference.
Performance Characteristics
Reflow Soldering Curve (for LDD-300~1000HS)
The reflow soldering curve indicates temperature profiles for soldering. It shows a peak temperature of 240°C for a maximum of 10 seconds, with a duration of 60 seconds maximum above 220°C. This curve applies specifically to Hot Air Reflow Soldering.
Derating Curve
The derating curve illustrates the relationship between ambient temperature (Ta) and the maximum load percentage. For example, models 600mA-1200mA are rated up to 71°C, while the 1500mA model is rated up to 65°C. Models 300mA-500mA are rated up to 85°C.
PWM Dimming Control
The PWM dimming control allows for output current modulation. A high PWM signal (e.g., 5V) turns the driver ON, while a low signal (e.g., 0V) turns it OFF. The output current is proportional to the duty cycle, reaching maximum at 100% duty cycle and zero at 0% duty cycle. The tolerance is typically ±3%.
Standard Application
A typical application circuit shows the LDD-H driver connected between the input voltage (+Vin, -Vin) and the LED string (+Vout, -Vout). A PWM signal is applied to the DIM pin for dimming control. The driver is connected to the first LED in the string, with the last LED completing the circuit.
Efficiency vs. Output Voltage (Number of LEDs)
Several graphs display the efficiency of the LDD-H series drivers across different input voltages and output configurations:
- Fig-1: 12VDC input, 1-3 LEDs (Vf=3V). Efficiency is shown for various output currents (300mA to 1500mA).
- Fig-2: 24VDC input, 1-7 LEDs (Vf=3V). Efficiency is plotted against output voltage (number of LEDs) for different output currents.
- Fig-3: 36VDC input, 1-10 LEDs (Vf=3V). Efficiency curves are presented for various output currents.
- Fig-4: 48VDC input, 1-14 LEDs (Vf=3V). Efficiency is shown versus output voltage for different output currents.
In general, efficiency is high, often exceeding 80% and reaching up to 97% under optimal conditions.
