BP2861
High-efficiency non-isolated LED driver with integrated 500V MOSFET for bulb and downlight applications up to 12W
Product Overview
Description
The BP2861 is a high-efficiency non-isolated LED driver IC designed for low-power lighting applications. It features an integrated 500V power MOSFET and operates in critical conduction mode for optimal efficiency.
This driver supports universal AC input voltage (85V-265V) and provides accurate constant current regulation with ±3% precision. The simple BOM and compact design make it ideal for space-constrained applications.
Built-in protection features include LED short protection, over-temperature protection, and cycle-by-cycle current limiting. The BP2861 is suitable for LED bulbs, downlights, and other consumer lighting products.
Product Series
BP
Primary Application
LED bulbs
Key Features
- Integrated 500V power MOSFET
- Critical conduction mode operation
- High accuracy constant current control
- Universal AC input range
- Built-in protection features
- Simple BOM and compact design
Specifications
| Input Voltage | 85V-265V AC |
|---|---|
| Output Power | Up to 12W |
| Current Accuracy | ±3% |
| Switching Frequency | Critical conduction mode |
| Integrated MOSFET | 500V |
| Efficiency | >90% |
| Package | SOP-8 |
Applications
LED bulbs
Electronic system design
Downlights
Electronic system design
Panel lights
Electronic system design
Tube lights
Electronic system design
Consumer lighting
Consumer electronics
FAE Expert Insights
"The BP2861 is an excellent choice for cost-sensitive LED bulb applications where space and cost are critical. In my experience supporting lighting manufacturers, this driver's integrated MOSFET and simple design significantly reduce BOM cost and PCB size. The critical conduction mode operation provides good efficiency without the complexity of valley switching. I recommend this part for applications up to 12W where non-isolated topology is acceptable. For designs requiring higher power or isolation, consider the BP series isolated drivers. Pay attention to thermal design as the integrated MOSFET dissipates heat directly through the IC."
Cost-effective solution for LED bulb applications with minimal BOM
— Michael Chen, BeiLuo
Frequently Asked Questions
What is the maximum output power of BP2861?
The BP2861 supports maximum output power of 12W under typical operating conditions. The actual maximum power depends on input voltage, thermal conditions, and LED configuration. At high input voltages (220V-265V), the maximum power may be slightly reduced due to thermal limitations. For reliable operation, it is recommended to operate at 80% of maximum rated power with adequate thermal management.
For applications above 10W, verify thermal performance or consider BP2865 with higher power rating.
Can BP2861 be used for triac dimming applications?
The BP2861 is designed for non-dimming or analog dimming applications. It does not include built-in triac dimming compatibility. For triac dimming applications, consider BPSemi drivers specifically designed for phase-cut dimming such as the BP series with dimming interface. Alternatively, external dimming circuits can be added, but this increases design complexity and cost.
For triac dimming, select BPSemi drivers with built-in dimming support or contact LiTong for compatible solutions.
What is the recommended PCB layout for BP2861?
For optimal performance with BP2861, place input filter capacitor close to the IC input pins. Minimize the loop area of the switching current path to reduce EMI. Provide adequate copper area for the IC ground pin and MOSFET drain for heat dissipation. Keep sensitive feedback traces away from switching nodes. Use Kelvin connection for current sense resistor. LiTong FAEs can provide detailed layout guidelines and review your PCB design.
Follow BPSemi reference design layout or contact LiTong for PCB layout review services.
How do I calculate the current sense resistor value?
The current sense resistor value is calculated using the formula: Rsense = Vref / Iled, where Vref is the internal reference voltage (typically 0.3V) and Iled is the desired LED current. For example, for 300mA LED current, Rsense = 0.3V / 0.3A = 1 ohm. Use a resistor with appropriate power rating (P = I² × R) and tolerance to achieve accurate current regulation. Consider using parallel resistors for higher power dissipation.
Use BPSemi's design tools or contact LiTong FAEs for resistor value calculations.
What are the key differences between BP2861 and BP2865?
The main difference is output power capability: BP2861 supports up to 12W while BP2865 supports up to 18W. BP2865 has a larger die and better thermal characteristics for higher power applications. Both use the same SOP-8 package and have similar electrical characteristics. The BP2865 is recommended for applications requiring 12W or higher output power, while BP2861 is more cost-effective for lower power applications up to 10W.
Choose BP2861 for applications under 10W, BP2865 for 10-18W applications. Contact LiTong for selection guidance.