Onsemi NCL30002

Description

The NCL30002 is a switch mode power supply controller intended for low to medium power single stage power factor (PF) corrected LED Drivers. The device operates as a critical conduction mode (CrM) buck controller to regulate LED current at a high power factor for a specific line voltage range. The current limit threshold is tightly trimmed allowing open loop control techniques to reduce parts count while maintaining accurate current regulation and high power factor.CrM operation is particularly suited for LED applications as very high efficiency can be achieved even at low power levels. These are important in LED lighting to comply with regulatory requirements and meet overall system luminous efficacy requirements. In CrM, the switching frequency will vary with line and load. Switching losses are low as recovery losses in the output rectifier are negligible since the current goes to zero prior to reactivating the main MOSFET switch.The device features a programmable on time limiter, zero current detect sense block, gate driver, trans−conductance error amplifier as well as all PWM control circuitry and protection functions required to implement a CrM switch mode power supply. Moreover, for high efficiency, the device features low startup current enabling fast, low loss charging of the VCC capacitor. The current sense protection threshold has been set at 485 mV to minimize power dissipation in the external sense resistor. To support the environmental operation range of Solid State Lighting, the device is specified across a wide junction temperature range of −40°C to 125°C.

Features

• Very Low 24 A Typical Startup Current
• Cycle−by−Cycle Current Protection
• Tightly Trimmed Low Current Sense Threshold of 485 mV ±2%
• Low 2 mA Typical Operating Current
• Source 500 mA / Sink 800 mA Totem Pole Gate Driver
• Wide Operating Temperature Range
• Enable Function and Overvoltage Protection
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS-Compliant

Typical applications

• Commercial and Residential LED Fixtures
• LED Driver Power Supplies
• LED Based Bulbs

More information

• Datasheet