Overview
The NCL30000DR2G, produced by onsemi, is a switch-mode power supply controller designed for low to medium power single-stage power factor (PF) corrected LED drivers. It operates in critical conduction mode (CrM) and is suitable for both flyback and buck topologies. This controller is particularly beneficial for isolated flyback LED applications due to its straightforward control scheme and high efficiency, even at low power levels. The NCL30000DR2G is crucial for complying with regulatory requirements and achieving high system luminous efficacy in LED lighting.
Key Specifications
| Characteristic | Test Conditions | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Startup Voltage Threshold | VCC Increasing | VCC(on) | 11 | 12 | 12.5 | V |
| Minimum Operating Voltage | VCC Decreasing | VCC(off) | 8.8 | 9.5 | 10.2 | V |
| Supply Voltage Hysteresis | HUVLO | 2.2 | 2.5 | 2.8 | V | |
| Startup Current Consumption | 0 V < VCC < VCC(on) −200 mV | Icc(startup) | 24 | 35 | μA | |
| No Load Switching Current Consumption | CDRV = Open, 70 kHz Switching | 2 | mA | |||
| Ct Peak Voltage | VCOMP = open | VCt(MAX) | 4.775 | 4.93 | 5.025 | V |
| On Time Capacitor Charge Current | VCOMP = open, VCt = 0 V to VCt(MAX) | Icharge | 235 | 275 | 297 | μA |
| Ct Capacitor Discharge Duration | VCOMP = open, VCt = VCt(MAX) −100 mV to 500 mV | tCt(discharge) | 50 | 150 | ns | |
| Drive Resistance | Isource = 100 mA, Isink = 100 mA | ROH, ROL | 12, 6 | 20, 13 | Ω | |
| Rise Time | 10% to 90% | trise | 35 | 80 | ns | |
| Fall Time | 90% to 10% | tfall | 25 | 70 | ns | |
| Current Sense Voltage Threshold | VILIM | 0.45 | 0.5 | 0.55 | V |
Key Features
- Very Low Startup Current: Typical startup current of 24 μA, enabling fast and low-loss charging of the VCC capacitor.
- Constant On Time PWM Control: Operates in critical conduction mode (CrM) with a fixed on-time variable frequency, ensuring high efficiency.
- Cycle-by-Cycle Current Protection: Provides overcurrent protection by sensing the current through the MOSFET switch.
- Low Current Sense Threshold: Current sense threshold set at 500 mV to minimize power dissipation in the external sense resistor.
- Low Operating Current: Typical operating current of 2 mA.
- Totem Pole Gate Driver: High current capability of 500 mA source and 800 mA sink, suitable for driving high gate charge power MOSFETs.
- Reference Design for Dimmers: Supports TRIAC and trailing edge line dimmers.
- Wide Operating Temperature Range: Specified across a junction temperature range of −40°C to 125°C.
- No Input Voltage Sensing Requirement: Simplifies the design by eliminating the need for input voltage sensing.
- Enable Function and Overvoltage Protection: Features an enable function and overvoltage protection for reliable operation.
- Environmental Compliance: Pb-Free, Halogen Free/BFR Free, and RoHS compliant.
Applications
- LED Driver Power Supplies: Ideal for power factor corrected LED driver applications.
- LED Based Down Lights: Suitable for commercial and residential LED down lights.
- Commercial and Residential LED Fixtures: Used in various LED lighting fixtures.
- TRIAC Dimmable LED Based PAR Lamps: Supports dimming capabilities in PAR lamps.
- Power Factor Corrected Constant Voltage Supplies: Applicable in constant voltage supplies with power factor correction.
Q & A
- What is the primary function of the NCL30000DR2G?
The NCL30000DR2G is a switch-mode power supply controller designed for low to medium power single-stage power factor (PF) corrected LED drivers.
- What operating mode does the NCL30000DR2G use?
The NCL30000DR2G operates in critical conduction mode (CrM).
- What is the typical startup current of the NCL30000DR2G?
The typical startup current is 24 μA.
- What is the current sense threshold of the NCL30000DR2G?
The current sense threshold is set at 500 mV.
- What is the operating temperature range of the NCL30000DR2G?
The device is specified across a junction temperature range of −40°C to 125°C.
- Does the NCL30000DR2G support dimming?
Yes, it supports TRIAC and trailing edge line dimmers.
- What is the gate driver capability of the NCL30000DR2G?
The totem pole gate driver has a high current capability of 500 mA source and 800 mA sink.
- Is the NCL30000DR2G environmentally compliant?
Yes, it is Pb-Free, Halogen Free/BFR Free, and RoHS compliant.
- What are some typical applications of the NCL30000DR2G?
Typical applications include LED driver power supplies, LED based down lights, commercial and residential LED fixtures, and TRIAC dimmable LED based PAR lamps.
- How does the NCL30000DR2G achieve high power factor?
The device achieves high power factor through its critical conduction mode operation and by ensuring the input current follows the applied voltage, resulting in a sinusoidal line current with minimal phase displacement.
