Key words:
LED driver, NCL30051, On, SEMI, offline
On Semi's NCL30051 for PFC and half-bridge resonant combination controller offline LED lighting solutions, integrates all functions of high efficiency and compact LED driver / power required, including critical conduction mode (a CrM) PFC liter 600V pressure controller and a built-in half-bridge resonant drive controller, mainly for driver and power efficient LED, electrical control gear and lighting ballasts. NCL30051 article describes the main features, a block diagram of a typical application circuit 60W, and evaluation board NCL30051LEDGEVB indicators, schematics and bill of materials (BOM).
NCL30051LEDGEVB: 60W 90-265 Vac 35-50 V Constant Current up to 1.5A Isolated LED Driver
The NCL30051 is a combinaTIon of PFC and half-bridge resonant controllers opTImized for off-line LED lighTIng soluTIons. This device integrates all the features needed to implement a highly efficient and small form factor LED Driver / Power Supply. It contains a critical conduction mode (CrM) power factor correction (PFC) boost controller and a half-bridge resonant controller with a built-in 600 V driver. The half-bridge stage operates at a fixed frequency, greatly simplifying the control implementations. The output (current or voltage ) regulation is achieved by adjusting the PFC stage output voltage - based on a control signal generated external to the NCL30051.
This device includes an enable input on the PFC feedback pin, open feedback loop protection and PFC overvoltage and undervoltage detectors. Other features included in the NCL30051 are a 600 V startup circuit and an adjustable frequency oscillator with a divide by 2 circuit to assure true symmetric duty ratio. The controllers are properly sequenced, simplifying system design.
NCL30051 main features:
Voltage Mode CrM Power Factor Correction Controller
pFC Open Feedback Loop Protection
pFC Undervoltage Detector
pFC Overvoltage Detector
Half-Bridge Stage with 600 V High Side Gate Drive
State Machine Ensures Proper Turn-on and Turn-off of Half-Bridge Stage
Controllers are Properly Sequenced for Fault Free Operation
Non-Latching Fault Management
Internal 600 V Startup Circuit
Wide Temperature Range of -40C to + 125C
This is a Pb-Free Device
NCL30051 Typical applications:
High Efficiency LED Drivers and Power Supplies
Electronic Control Gear
Lighting Ballasts
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1.NCL30051 functional block diagram of FIG.
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Application of a simplified block diagram of FIG. 2.NCL30051
This is a fully isolated up to 60 W, 90-265 Vac off-line, power factor corrected, constant current LED driver using ON Semiconductor's new NCL30051 two-stage controller. This controller contains the control circuitry for both a critical conduction mode (CRM ) boost power factor corrector (PFC), and a fixed frequency, series resonant half-bridge converter, and is housed in a 16 pin SOIC package. The driver is designed to support strings of LEDs that have a forward voltage ranging from 35-50 V and has a nominal driver current of 1000 mA although the current can be increased to 1500 mA with simple component changes on the board. This specific driver design is tailored to support LEDs such as the Cree XLAMP ™ XP-G and XM-L, and OSRAM Golden DRAGON ™ Plus that have maximum drive currents of at least 1000 mA. This board has supports a range of flexible dimming options including bi-level, PWM and analog dimming. Details of the demo board are described in evaluation board manual EVBUM2039 / D.
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