NCL30051LEDGEVB ON Semiconductor, NCL30051LEDGEVB Datasheet
NCL30051LEDGEVB
Specifications of NCL30051LEDGEVB
Related parts for NCL30051LEDGEVB
NCL30051LEDGEVB Summary of contents
Page 1
... W nominal application, the controller topology is ideal for power levels to 200 W and higher. This specific design is available as evaluation board NCL30051LEDGEVB. There are a wide variety of medium power lighting applications that would benefit from replacing the traditional light source with an LED source including street lights, refrigerator cases, parking garages, wall washers, wall packs and architectural lighting ...
Page 2
Beyond the power stage design, circuitry is provided for demonstrating three types of dimming control: • Analog dimming with programming signal; • Bi−level dimming with a simple logic level input signal; • PWM dimming using ...
Page 3
C16 Figure 1. Primary Side Schematic http://onsemi.com R17 10K MMSZ5248B 3 ...
Page 4
Power Factor Correction Section The boost power factor corrector circuit is composed of MOSFET Q1, boost diode D6, boost inductor L2, and the components associated with the PFC control section and pins of the NCL30051 control IC U1. D5 provides ...
Page 5
... The current and voltage sensing circuitry is based around the NCS1002 CVCC controller. The specific sensing circuitry is essentially identical to that used in ON Semiconductor application note AND8470 for the NCL30001 LED controller and will only be briefly described here. Current regulation is accomplished by section B of U4. ...
Page 6
Figure 3. Secondary Side Schematic http://onsemi.com 6 ...
Page 7
Resonant Half−Bridge Transformer Design (T1) Since the half−bridge transformer operates in a fixed frequency, symmetrical duty ratio, the design becomes very straightforward. A half−bridge converter switches 1/2 of bulk voltage across the transformer primary due to the capacitive divider network ...
Page 8
Part Description: Resonant Half−bridge Transformer − kHz (Rev 3) Schematic ID: T1 Core Type: PQ20/20, Ferroxcube 3C95 or equivalent material Primary Inductance minimum Leakage Inductance: 90 − 100 uH nominal (resonant half−bridge, leakage inductance is ...
Page 9
... PFC Choke Design (L2) Using the PFC design approach illustrated in ON Semiconductor Application Note AND8123, we can analyze the PFC choke design. Inductor rms current output and 85 Vac input: 0.72 A Inductor peak current out and 85 Vac input: 1.75 A Maximum inductance for reasonable switching frequency: 1200 mH max ...
Page 10
Part Description: PFC Choke − 100 kHz (CRM); Rev. 4 (6/8/10) Schematic ID: L2 Core Type: PQ20/20, Ferroxcube 3C95 or equivalent material Core Gap: Gap for 675 uH +/−25 uH across pins Inductance: 650 − ...
Page 11
Dimming Capabilities To demonstrate the LED dimming capabilities of this circuit, the same DIM control card used in the NCL30001 LED driver circuit described in AND8470 has been used here. Dimming can be accomplished using three methods: pulse width modulation ...
Page 12
Figure 8. Output Current/Voltage Transfer Function versus Line 230 Vac 120 Vac 400 500 600 700 OUTPUT CURRENT (mA) http://onsemi.com 14 800 900 1000 ...
Page 13
Figure 9. Minimum Forward Voltage versus Line and Output Current Efficiency With this topology it is possible to achieve better than 90% efficiency even at modest loads. As illustrated in Figure 10, ...
Page 14
Power Factor and Input Harmonic Content The power factor will remain above 0.90 for the rated load output (1 A) and to minimum V levels for 120 Vac ...
Page 15
Vac 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0. OUTPUT FORWARD VOLTAGE (Vdc) Figure 11. Power Factor versus Forward Voltage (I 1.00 0.95 0.90 0.85 0.80 0.75 0.70 90 115 140 INPUT LINE VOLTAGE (Vac) Figure ...
Page 16
Figure 13. Harmonic Levels (230 Vac input, Full Load) Dimming Effects on Power Factor and V The power factor is also affected by both analog and PWM dimming ...
Page 17
Vac; Analog Dim 0.95 0.90 230 Vac; Analog Dim 0.85 0.80 0.75 0. Dimming Limitations PWM dimming is effective down to less than 5% duty ratio for 120 and 230 Vac within the V graphs of ...
Page 18
Figure 15. Output Current Ripple Load and V Output Current Profile at Turn−on Despite the low control loop bandwidth (approximately 25 Hz), the output current profile during start−up when the ac line is applied is very well ...
Page 19
Peak Neutral 5/18/2010 2:51:02 PM Figure 17. Conducted EMI Spectrum with V Figure 18. Input Line Current under Different Operating Conditions EN 55022; Class A ...
Page 20
... NCL30051 Data Sheet 2. NCS1002 CVCC controller data sheet 3. ON Semiconductor Application Note AND8470 Semiconductor Application Note AND8427 Semiconductor Design Note DN06068/D N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81− ...