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MOS Power IC Full Range
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Photocoupler
The NCL30000 is a compact yet highly efficient switching power supply controller designed specifically for single-stage power factor correction (PFC) LED drivers. With an exceptionally low startup current of just 24 microamperes and an operational current of only 2 milliamperes, this device offers remarkable energy efficiency. It also features cycle-by-cycle current protection and provides a robust 500mA current source, 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 delves into the key features of the NCL30000, including its block diagrams, simplified application block diagrams, and simplified flyback application block diagrams. Additionally, it includes the circuit diagram and bill of materials (BOM) for the NCL30000LED2GEVB evaluation board.
The NCL30000 is engineered to operate in critical conduction mode (CrM), which makes it suitable for both flyback and buck topologies. In CrM, the switching frequency adjusts dynamically based on line and load conditions, minimizing switching losses as the output rectifier's recovery losses are negligible when the current reaches zero before the main MOSFET switch is reactivated.
The device incorporates a programmable on-time limiter, a zero-current detection sensing block, a gate driver, a transconductance error amplifier, and all necessary PWM control circuits and protection mechanisms to implement a CrM switch-mode power supply. Its low startup current allows for rapid, low-loss charging of the VCC capacitor. The current-sense protection threshold is set at 500 millivolts to reduce power dissipation in the external sense resistor. Designed to meet the stringent demands of solid-state lighting, the NCL30000 operates across a wide junction temperature range from -40°C to 125°C.
Key Features of NCL30000:
- Very low startup current of 24 μA typical
- Constant on-time PWM control
- Cycle-by-cycle current protection
- Low current-sense threshold of 500 mV
- Low operating current of 2 mA typical
- Totem pole gate driver capable of sourcing 500 mA and sinking 800 mA
- 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
- Environmentally friendly, Pb-free, halogen-free/BFR-free, and RoHS compliant
Typical Applications:
- 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
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