Small and medium-sized switching power supply based on NCL30000 - Power Circuit - Circuit Diagram
The NCL30000 is a controller specifically designed for small to medium-sized switching power supplies, particularly for single-stage PFC LED drivers. It boasts an impressively low startup current of 24uA and an operational current of just 2mA, providing cycle-by-cycle current protection. Additionally, it can source up to 500mA of current, making it ideal for applications such as LED driver power supplies, commercial and residential LED decorative lighting, and PFC constant voltage power supplies. This article provides a detailed overview of the key features of the NCL30000, including its block diagrams, simplified application block diagrams, and simplified flyback application block diagrams. Furthermore, it includes the circuit diagram and bill of materials (BOM) for the NCL30000LED2GEVB evaluation board.
The NCL30000 is tailored for low to medium-power single-stage power factor (PF) corrected LED drivers. It operates in critical conduction mode (CrM), making it suitable for both flyback and buck topologies. In CrM, the switching frequency adjusts dynamically with varying line and load conditions, resulting in lower switching losses. Since the current reaches zero before the main MOSFET switch is reactivated, recovery losses in the output rectifier are negligible.
The device includes a programmable on-time limiter, zero current detection sensing block, gate driver, trans-conductance error amplifier, and all necessary PWM control circuits and protection functions to implement a CrM switch-mode power supply. With a low startup current, it enables fast and low-loss charging of the VCC capacitor. The current sense protection threshold is set at 500mV to minimize power dissipation in the external sense resistor. To ensure reliable performance across a wide range of solid-state lighting applications, the device is specified for operation over a broad junction temperature range from -40°C to 125°C.
Main Features of NCL30000:
- Very Low 24uA Typical Startup Current
- Constant On-Time PWM Control
- Cycle-by-Cycle Current Protection
- Low Current Sense Threshold of 500mV
- Low 2mA Typical Operating Current
- Totem Pole Gate Driver: Source 500mA / Sink 800mA
- Reference Design for TRIAC and Trailing Edge Line Dimmers
- Wide Operating Temperature Range (-40°C to 125°C)
- No Input Voltage Sensing Requirement
- Enable Function and Overvoltage Protection
- Pb-Free, Halogen-Free/BFR-Free, and RoHS Compliant
Typical Applications of NCL30000:
- LED Driver Power Supplies
- LED-Based Downlights
- Commercial and Residential LED Fixtures
- TRIAC Dimmable LED-Based PAR Lamps
- Power Factor Corrected Constant Voltage Supplies
Figure 1: NCL30000 Block Diagram
Figure 2: Simplified NCL30000 Application Block Diagram
Figure 3: Simplified Flyback Application Block Diagram: Secondary Constant Current Control
This controller offers an excellent combination of efficiency, reliability, and ease of use, making it a top choice for modern LED lighting solutions. Whether you're designing a residential downlight or a commercial LED fixture, the NCL30000 provides the flexibility and performance needed to meet your requirements. Its compatibility with both flyback and buck topologies ensures adaptability across various applications, while its robust protection features make it a dependable option for demanding environments.
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