LTF150-42
150W constant current LED driver with 2100mA output, 36-72V range, 0-10V dimming for commercial lighting.
Product Overview
Description
The LTF150-42 from TDK-Lambda is a high-efficiency 150W constant current LED driver designed for commercial and industrial lighting applications. Delivering a regulated 2100mA output current with a wide 36-72V compliance voltage range, this driver can power LED arrays from 12 to 24 high-power LEDs in series. The driver achieves up to 94% efficiency, minimizing energy costs and heat generation in the fixture. Standard 0-10V analog dimming allows integration with occupancy sensors and daylight harvesting systems. The compact metal case with IP20 rating is suitable for indoor luminaires and outdoor fixtures with adequate protection. Comprehensive protection features include overvoltage, short circuit, and overtemperature protection. The 50,000-hour rated lifetime ensures reliable operation matching LED fixture life.
Product Series
LTF
Primary Application
High-bay industrial lighting
Key Features
- 150W constant current 2100mA output
- Wide 36-72V output voltage range
- High efficiency 94%
- Universal 90-305VAC input
- 0-10V analog dimming
- Active power factor correction
- 50,000 hour rated lifetime
- Comprehensive protection
Specifications
| outputPower | 150W |
|---|---|
| outputCurrent | 2100mA |
| outputVoltageRange | 36-72V |
| efficiency | 94% |
| inputVoltage | 90-305VAC |
| powerFactor | >0.95 |
| thd | <20% |
| dimming | 0-10V analog |
| operatingTemperature | -40°C to +90°C |
| mtbf | 100,000 hours |
| protection | IP20 |
Applications
High-bay industrial lighting
Industrial automation and control
Commercial downlights
Electronic system design
Street lighting
Electronic system design
Flood lighting
Electronic system design
Tunnel lighting
Electronic system design
Warehouse lighting
Electronic system design
Gymnasium lighting
Electronic system design
Retail lighting
Electronic system design
FAE Expert Insights
"The LTF150-42 is a versatile workhorse for commercial LED lighting. The 2100mA current rating is perfect for modern high-power LEDs, and the 36-72V range gives flexibility in LED string design. I've used these in high-bay fixtures, street lights, and flood lights with excellent results. The 94% efficiency is impressive - it makes a real difference in thermal management compared to 85-88% efficient drivers. The 0-10V dimming works reliably with all standard controllers I've tried. One feature I appreciate is the wide 90-305VAC input - it handles both 120V and 277V commercial power without different models. The 5-year warranty and TDK-Lambda's reputation give confidence for specification in commercial projects. For general commercial lighting, this driver hits the sweet spot of performance and value."
Versatile 150W driver with excellent efficiency for commercial LED lighting
— Mark Johnson, BeiLuo
Frequently Asked Questions
How many LEDs can the LTF150-42 drive?
The number of LEDs the LTF150-42 can drive depends on LED forward voltage: For 3V LEDs (typical): 12 to 24 LEDs in series (36-72V range); For 6V LEDs: 6 to 12 LEDs in series; For 9V LEDs: 4 to 8 LEDs in series. The driver's constant current of 2100mA means all LEDs in the string receive exactly 2100mA. Multiple parallel strings can be driven if each string has its own current balancing. Total LED power should not exceed 150W (driver rated power). For example: 20 x 3V LEDs at 2.1A = 126W, which is within the 150W rating. Always verify the actual forward voltage of your LEDs at operating temperature, as Vf increases with temperature. The driver's wide 36-72V range accommodates various LED configurations.
Calculate total LED string voltage and ensure it falls within 36-72V range. Total LED power should not exceed 150W.
What is the minimum dimming level of the LTF150-42?
The LTF150-42 supports dimming down to 5% of rated current (approximately 105mA) using 0-10V analog control: At 10V or open circuit: Full output 2100mA (100%); At 1V: Minimum output approximately 105mA (5%); Below 1V: Output may drop to zero or remain at minimum depending on model; Dimming curve is approximately linear from 1V to 10V. The 5% minimum is sufficient for most applications including daylight harvesting and occupancy-based dimming. For applications requiring deeper dimming (1% or below), consider DALI-equipped models or drivers specifically designed for deep dimming. The dimming response time is fast - less than 1 second from full bright to minimum. Flicker-free operation is maintained throughout the dimming range.
For standard commercial dimming applications, the 5-100% range is adequate. For deeper dimming, select models with extended dimming range.
Can the LTF150-42 be used in outdoor fixtures?
The LTF150-42 has an IP20 rating, meaning it is protected against solid objects larger than 12mm but has no water protection. For outdoor use: The driver must be installed inside a fixture with adequate IP rating (IP65 or higher for outdoor); The fixture must provide protection against rain, snow, and moisture; Ambient temperature inside the fixture must not exceed +90°C; Adequate ventilation is required to prevent overheating. For fully exposed outdoor applications, consider: LTF series models with IP65 or IP67 ratings; External driver boxes with appropriate IP rating; Drivers specifically designed for outdoor street lighting. The driver's -40°C to +90°C operating temperature range is suitable for outdoor environments, but the IP20 rating requires fixture-level protection. Surge protection is built-in for outdoor electrical environments.
For outdoor use, install IP20 drivers inside IP-rated fixtures, or select IP65/IP67 rated drivers for exposed installations.
What is the inrush current of the LTF150-42?
The LTF150-42 has controlled inrush current to prevent nuisance tripping of circuit breakers: Peak inrush current is typically 25A for less than 1ms at 230VAC; Inrush is limited by an internal NTC thermistor and soft-start circuit; Multiple drivers can be connected to the same circuit without excessive inrush; For large installations with many drivers, consult an electrician for proper circuit sizing. The inrush current is well within the capabilities of standard C-type circuit breakers. For applications with strict inrush limitations, the soft-start design ensures gradual current increase. The power factor correction circuit also minimizes inrush by controlling capacitor charging. If connecting multiple drivers to a single circuit, the combined inrush should be considered when sizing breakers.
Standard circuit breakers can handle LTF150-42 inrush current. For large installations with many drivers, calculate combined inrush for proper circuit sizing.
How do I connect the 0-10V dimming wires?
The LTF150-42 0-10V dimming connection is simple and polarity-sensitive: Dim+ (purple wire) - connect to controller 0-10V positive output; Dim- (grey wire) - connect to controller 0-10V negative/return; The driver sources a small current (approximately 100uA) on the dimming circuit; Multiple drivers can be connected in parallel to the same dimmer; Maximum cable length is typically 20 meters depending on wire gauge. Wiring guidelines: Use twisted pair or shielded cable for long runs to minimize noise pickup; Do not run dimming wires in the same conduit as AC power wires; If dimming wires must cross AC wires, cross at 90 degrees; Leave dimming wires open (unconnected) for full brightness operation. The dimming circuit is isolated from AC input and LED output for safety. Standard 0-10V controllers from any manufacturer should work with this driver.
Follow wiring best practices to ensure reliable dimming operation. Leave dimming wires unconnected for full brightness.