User Manual

ManualsBrandsonsemi ManualsEvaluation Boardonsemi NCL30060GEVB Off-line Critical Conduction Mode PFC LED Driver Evaluation Board

 Semiconductor Components Industries, LLC, 2014

May, 2014 − Rev. 0

1 Publication Order Number:

EVBUM2240/D

NCL30060GEVB

Off‐line Critical Conduction

Mode PFC LED Driver

Evaluation Board

User's Manual

Description

Value Unit

Input Voltage Range 90 − 305 V rms

Line Frequency Range 45 – 66 Hz

Output Current 700 mA

Output Voltage Range 10 – 41 V dc

Maximum Output Power 25 W

Power Factor (Typical) 0.99 −

THDi (Typical) < 10 %

Efficiency (Typical) 87.5 %

Introduction

The NCL30060 is intended to control a high performance

critical conduction mode (CrM) LED driver providing high

power factor and low total harmonic distortion of input

current utilizing constant on-time control. This evaluation

board provides constant current (CC) to the load over a wide

LED string voltage range.

The NCL30060 provides many features including high

voltage start-up, direct drive for external power MOSFET,

frequency dithering to reduce the EMI profile, maximum

on-time protection, over voltage protection, and short circuit

protection. These features work together to provide a robust

LED driver solution packaged in a compact SO-7 case with

one pin removed for improved creepage distance.

As configured, this evaluation board provides 700 mA

constant current at up to 25 W and directly interfaces to

a string of LEDs. This evaluation board supports 1−10 V

and PWM dimming control signals referenced to low

voltage secondary circuits. The default configuration

supports standard 1−10 V dimming. The evaluation board

will support PWM dimming by populating alternate

component positions provided on the PCB.

An in-depth description of constant on-time control and

performance of a single stage flyback LED driver can be

found in the datasheet of a related controller,

the

NCL30000

This manual also addresses modifications to change the

output current and output voltage ranges. The NCL30060

specification contains additional information on operation

of the controller. Design calculations are presented in an

Excel



Worksheet available at

onsemi.com to aide in

customized design applications.

The compact evaluation board is constructed with

through-hole components on the top and surface mount

components on the bottom side. This driver was designed to

meet safety agency requirements but has not been evaluated

for compliance. When operating this board, observe safe

standard working practices. High voltages are present and

caution should be exercised when handling or probing

various points to avoid personal injury or damage to the

unit.

Figures 1 and 2 illustrate the top and bottom sides of the

evaluation board. AC input power connects to the block

labeled J1. Terminals are marked “L” and “N” representing

Line and Neutral leads. The LED load connects to the

terminal block labeled J2 with polarity as marked.

The anode of the LED load should be connected to “+” and

the cathode to “−” terminal. Never connect LEDs to the

driver while it is running or before the output capacitors

discharge after removing input power. With no load

connected, the output capacitors charge to > 44 V. Energy

stored in the output capacitance can damage or shorten the

effective life of the LEDs if improperly discharged into the

LEDs.

The schematic for the power section is shown in Figure 3,

and dimming schematic is shown in Figure 4.

Dimming control is accessible through the smaller

connector labeled J31. Components have already been

placed on the board to support standard 1−10 V dimming

where a 10 V level provides full output current and 1 V or

below reduces the LED current to a minimum level.

The response between 1 and 10 V is linear in terms of LED

current.

This evaluation board will also support PWM dimming

control by populating the board with the appropriate

components as listed on the evaluation board Bill of

Materials. The board was not intended to support both

dimming methods simultaneously; therefore only

components for one type of interface should be fitted at

a time.

The dimming interfaces are optional and do not require

any connections if dimming is not required. This evaluation

board does not support phase-cut or TRIAC dimming

functions.

http://onsemi.com

EVAL BOARD USER’S MANUAL

Downloaded from Arrow.com.

Summary of content (13 pages)

PAGE 1
NCL30060GEVB Off‐line Critical Conduction Mode PFC LED Driver Evaluation Board User's Manual http://onsemi.com Value Unit Input Voltage Range 90 − 305 V rms Line Frequency Range 45 – 66 Hz 700 mA 10 – 41 V dc 25 W Description Output Current Output Voltage Range Maximum Output Power Power Factor (Typical) 0.99 − THDi (Typical) < 10 % Efficiency (Typical) 87.
PAGE 2
NCL30060GEVB Figure 1. NCL30060G Evaluation Board (Top Side) Figure 2. NCL30060G Evaluation Board (Bottom Side) http://onsemi.com 2 Downloaded from Arrow.com.
PAGE 3
Downloaded from Arrow.com. J1−1 D1 MRA4007 R1 5.6 kW F1 FUSE 1 D3 MRA4007 MURD320 D8 C2 J2−2 T1 4.7 nF RV1 V300LA4 J1−2 1 Neutral C1 220 nF L2 6 mH L3 R1A 5.6 kW 2.2 mH 2 FL4 4 FL3 + FL2 D5 ES1M 5 D4 MRA4007 D2 MRA4007 1 FL1 Anode R14 22 kW 47 nF R2 5.6 kW C11 680 mF CX2 C12 680 mF CX1 N.F. R4 100 kW Line 1 VOUT Q5 MMBTA06 + C9 100 nF 3 R7 5.76 kW HV FB CS/ZCD RT VCC GND DRV 6 5 D6 MMSD103 5.
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Downloaded from Arrow.com. 100 Hz to 5 kHz Input Logic High = 2 to 5.5 V Logic Low < 0.6 V PWM Dimming Interface VOUT R31 1 kW 1 Control Input J31−2 2 Affects Maximum LED Current R34 330 kW R35 22 kW Minimum Input Voltage = 13 V 4 R33 10 kW 3 C31 10 mF U32 NCP431A 1 Adjust R6 Sets Minimum LED Current R41 10 kW U42 NCP431A R50 22 kW R48 3.16 kW 1 U41 TLV271 R46 6.2 kW − + 5 3 U43 NCP431A C42 100 nF R44 2.
PAGE 5
NCL30060GEVB General Behavior/Waveforms The evaluation board is based on a single stage flyback converter. This topology provides isolation and high power factor utilizing a single power magnetic and switching device. Single stage converters require minimizing filter capacitance after the diode bridge and loop response less than 20 Hz to achieve high power factor and low THDi. Shown below are waveforms of Q1 switching MOSFET drain voltage and current as monitored across sense resistor R12.
PAGE 6
NCL30060GEVB The voltage on the transformer bias winding remains constant until the core is demagnetized, at which time the voltage begins to fall. When the voltage crosses the zero current detect (ZCD) threshold of 55 mV, the gate drive (DRV) is issued which turns on the MOSFET. The DRV signal remains high until the on-time expires and then DRV falls to a low state turning off the MOSFET. When the MOSFET turns off, the bias winding voltage returns to the high state.
PAGE 7
NCL30060GEVB 50 45 40 Output Voltage (V) 35 30 25 20 15 10 5 0 0 100 200 300 400 500 600 700 800 Output Current (mA) 24 1.00 22 0.99 20 0.98 18 0.97 60 Hz THDi 50 Hz THDi 16 0.96 60 Hz PF 14 0.95 50 Hz PF 12 0.94 10 0.93 8 0.92 6 0.91 4 0.90 90 120 150 180 210 240 Input Voltage (Vac) Figure 12. Power Factor and THDi http://onsemi.com 7 Downloaded from Arrow.com. 270 300 Power Factor (PF) Input Current THD (%) Figure 11.
PAGE 8
NCL30060GEVB Setting Output Current Table 1. TRANSFORMER WIRE CONNECTIONS The LED output current is directly sensed to provide good regulation over a wide operating range. Current is sensed via a resistor (R24) placed in series with the negative output lead and the voltage across this resistor is compared to a reference to generate a feedback signal. The feedback signal is passed to the primary to control the on-time of the NCL30060 providing closed loop operation.
PAGE 9
NCL30060GEVB introduced by the transformer leakage inductance. Monitoring the bias winding to detect output voltage directly would indicate a false open load condition. The NCL30060 measures the ZCD pin 2 ms after the MOSFET turns off to allow the ringing to subside and avoid erroneous readings caused by leakage inductance. When the NCL30060 detects an open load condition, the MOSFET is turned off and is held off for 1.25 ms, at which time another DRV pulse is issued.
PAGE 10
NCL30060GEVB PWM Dimming boards can be connected in parallel allowing control of many lighting fixtures from one variable dc supply. The dimming interface will also support dimming control using a potentiometer noting that the evaluation board interface is capable of sourcing 10 V. (Note, a logarithmic taper potentiometer is suggested for more proportional light control with potentiometer setting.
PAGE 11
NCL30060GEVB Table 2. BILL OF MATERIALS Substitution Allowed Yes Designator Qty. Description Value Tolerance Footprint Manufacturer Manufacturer Part Number CY 1 Capacitor, Y5U X1Y1 4.
PAGE 12
NCL30060GEVB Table 2. BILL OF MATERIALS (continued) Substitution Allowed Designator Qty.
PAGE 13
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