Datasheet

ManualsBrandsON SEMICONDUCTOR ManualsDev KitsPCB design board

April, 2013 − Rev. 0

1 Publication Order Number:

NCL30081/D

NCL30081

Dimmable Quasi-Resonant

Primary Side Current-Mode

Controller for LED Lighting

The NCL30081 is a PWM current mode controller targeting isolated

flyback and non−isolated constant current topologies. The controller

operates in a quasi−resonant mode to provide high efficiency. Thanks

to a novel control method, the device is able to precisely regulate a

constant LED current from the primary side. This removes the need

for secondary side feedback circuitry, biasing and an optocoupler.

The device is highly integrated with a minimum number of external

components. A robust suite of safety protection is built in to simplify

the design. This device is specifically intended for very compact space

efficient designs. It supports step dimming by monitoring the AC line

and detecting when the line has been toggled on−off−on by the user to

reduce the light intensity in 5 steps down to 5% dimming.

Features

• Quasi−resonant Peak Current−mode Control Operation

• Primary Side Sensing (no optocoupler needed)

• Wide V

Range

• Precise LED Constant Current Regulation ±1% Typical

• Line Feed−forward for Enhanced Regulation Accuracy

• Low LED Current Ripple

• 250 mV ±2% Guaranteed Voltage Reference for Current Regulation

• ~ 0.9 Power Factor with Valley Fill Input Stage

• Low Start−up Current (10 mA typ.)

• Small Space Saving Low Profile Package

• 5 State Quasi−log Dimmable

• Wide Temperature Range of −40 to +125°C

• Pb−free, Halide−free MSL1 Product

• Robust Protection Features

♦ Over Voltage / LED Open Circuit Protection

♦ Secondary Diode Short Protection

♦ Output Short Circuit Protection

♦ Shorted Current Sense Pin Fault Detection

♦ Latched and Auto−recoverable Versions

♦ Brown−out

♦ V

Under Voltage Lockout

♦ Thermal Shutdown

Typical Applications

• Integral LED Bulbs

• LED Power Driver Supplies

• LED Light Engines

http://onsemi.com

PIN CONNECTIONS

See detailed ordering and shipping information in the package

dimensions section on page 30 of this data sheet.

ORDERING INFORMATION

TSOP−6

SN SUFFIX

CASE 318G

MARKING DIAGRAM

VIN

VCC

DRV

ZCD

GND

(Top View)

AAx = Specific Device Code

x = G or H

A = Assembly Location

Y = Year

W = Work Week

G = Pb−Free Package

AAxAYWG

(Note: Microdot may be in either location)

Summary of content (30 pages)

PAGE 1
NCL30081 Dimmable Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting The NCL30081 is a PWM current mode controller targeting isolated flyback and non−isolated constant current topologies. The controller operates in a quasi−resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler.
PAGE 2
NCL30081 . . Aux . 1 6 2 5 3 4 Figure 1. Typical Application Schematic for NCL30081 Table 1. PIN FUNCTION DESCRIPTION Pin No Pin Name Function Pin Description 1 ZCD Zero Crossing Detection 2 GND − 3 CS Current sense This pin monitors the primary peak current 4 DRV Driver output The current capability of the totem pole gate drive (+0.3/−0.5 A) makes it suitable to effectively drive a broad range of power MOSFETs.
PAGE 3
NCL30081 Aux_SCP GND CS_shorted Internal Thermal Shutdown WOD_SCP BO_NOK VCC Leading Edge Blanking S Aux_SCP Q DRV Qdrv VVLY R VREF STEP_DIM STOP CS_reset Constant−Current Control Ipkmax Max. Peak Current Limit VVIN Clamp Circuit offset_OK Valley Selection offset_OK Line Feedforward VCC VCC Over Voltage Protection VREF VVIN Aux.
PAGE 4
NCL30081 Table 2. MAXIMUM RATINGS TABLE Symbol Rating Value Unit VCC(MAX) ICC(MAX) Maximum Power Supply voltage, VCC pin, continuous voltage Maximum current for VCC pin −0.3, +35 Internally limited V mA VDRV(MAX) IDRV(MAX) Maximum driver pin voltage, DRV pin, continuous voltage Maximum current for DRV pin −0.3, VDRV (Note 1) −500, +800 V mA VMAX IMAX Maximum voltage on low power pins (except pins DRV and VCC) Current range for low power pins (except pins ZCD, DRV and VCC) −0.3, +5.
PAGE 5
NCL30081 Table 3. ELECTRICAL CHARACTERISTICS (Unless otherwise noted: For typical values TJ = 25°C, VCC = 12 V; For min/max values TJ = −40°C to +125°C, Max TJ = 150°C, VCC = 12 V) Description Test Condition Symbol Min Typ Max Unit VCC increasing VCC decreasing VCC decreasing VCC(on) VCC(off) VCC(HYS) VCC(reset) 16 8.2 8 3.5 18 8.8 – 4.5 20 9.4 – 5.
PAGE 6
NCL30081 Table 3. ELECTRICAL CHARACTERISTICS (Unless otherwise noted: For typical values TJ = 25°C, VCC = 12 V; For min/max values TJ = −40°C to +125°C, Max TJ = 150°C, VCC = 12 V) Description Test Condition Symbol Min Typ Max Unit ZCD threshold voltage VZCD increasing VZCD(THI) 25 45 65 mV ZCD threshold voltage (Note 4) VZCD decreasing VZCD(THD) 5 25 45 mV ZCD hysteresis (Note 4) VZCD increasing VZCD(HYS) 10 – – mV VZCD(short) 0.8 1 1.
PAGE 7
NCL30081 Table 3.
PAGE 8
NCL30081 TYPICAL CHARACTERISTICS 18.15 8.85 18.10 8.80 VCC(off) (V) VCC(on) (V) 18.05 18.00 8.75 8.70 17.95 17.90 −40 −20 0 20 40 60 80 8.65 −40 120 100 −20 0 20 40 60 80 100 120 TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C) Figure 3. VCC(on) vs. Junction Temperature Figure 4. VCC(off) vs. Junction Temperature 27.80 1.09 27.75 1.07 27.70 1.05 ICC1 (mA) VCC(OVP) (V) 27.65 27.60 27.55 1.03 1.01 27.50 0.99 27.45 0.97 27.
PAGE 9
NCL30081 TYPICAL CHARACTERISTICS 54 19 52 50 ICC(sFault) (mA) ICC(start) (mA) 17 15 13 48 46 44 42 11 40 9 −40 −20 0 20 40 60 80 100 38 −40 120 0 20 40 60 80 100 120 TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C) Figure 9. ICC(start) vs. Junction Temperature Figure 10. ICC(sFault) vs. Junction Temperature 1.51 1.002 1.000 1.50 0.998 1.49 VILIM (V) VCS(stop) (V) −20 0.996 1.48 0.994 1.47 0.992 1.46 −40 −20 0 20 40 60 80 100 0.
PAGE 10
NCL30081 TYPICAL CHARACTERISTICS 254 6.80 253 6.70 252 VREF (mV) tTIMO (ms) 6.60 6.50 6.40 251 250 249 248 6.30 247 −20 0 20 40 60 80 100 246 −40 120 0 20 40 60 80 100 TJ, JUNCTION TEMPERATURE (°C) Figure 15. tTIMO vs. Junction Temperature Figure 16. VREF vs.
PAGE 11
NCL30081 TYPICAL CHARACTERISTICS 14.5 55.8 14.0 55.6 55.4 13.0 VCS(low) (mV) VREF05 (mV) 13.5 12.5 12.0 11.5 54.8 54.4 10.5 10.0 −40 −20 0 20 40 60 80 100 54.2 −40 120 −20 0 20 40 60 80 100 120 TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C) Figure 21. VREF05 vs. Junction Temperature Figure 22. VCS(low) vs. Junction Temperature 2.42 17.65 2.41 17.60 2.40 17.55 VHL (V) KLFF (mA/V) 55.0 54.6 11.0 17.50 2.39 2.38 17.45 17.40 −40 2.
PAGE 12
NCL30081 TYPICAL CHARACTERISTICS 186.8 200 186.6 199 186.4 VVLY2−1/3−2 (mV) VVLY1−2/2−3 (mV) 198 186.2 186.0 185.8 185.6 195 193 185.2 −20 0 20 40 60 80 100 192 −40 120 0 20 40 60 80 100 TJ, JUNCTION TEMPERATURE (°C) Figure 27. VVLY1−2/2−3 vs. Junction Temperature Figure 28. VVLY2−1/3−2 vs. Junction Temperature 124.6 137 124.4 136 124.2 124.0 123.8 123.6 123.4 −40 −20 TJ, JUNCTION TEMPERATURE (°C) VVLY4−2/5−3 (mV) VVLY2−4/3−5 (mV) 196 194 185.4 185.
PAGE 13
NCL30081 37.3 50 37.2 49 VVLY11−7/12−8 (mV) VVLY7−11/8−12 (mV) TYPICAL CHARACTERISTICS 37.1 37.0 36.9 36.8 47 46 45 44 36.7 −40 −20 0 20 40 60 80 100 43 −40 120 −20 0 20 40 60 80 100 TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C) Figure 33. VVLY7−11/8−12 vs. Junction Temperature Figure 34. VVLY11−7/12−8 vs. Junction Temperature 15.6 21.0 15.1 20.5 VVLY13−11/15−12 (mV) VVLY11−13/12−15 (mV) 48 14.6 14.1 13.6 13.1 120 20.0 19.5 19.0 18.5 18.0 12.
PAGE 14
NCL30081 TYPICAL CHARACTERISTICS 53.5 85.0 84.5 84.0 52.5 tOVLD (ms) 83.5 52.0 51.5 51.0 50.0 −40 83.0 82.5 82.0 81.5 50.5 81.0 −20 0 20 40 60 80 100 80.5 −40 120 −20 0 20 40 60 80 100 TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C) Figure 39. tBO(BLANK) vs. Junction Temperature Figure 40. tOVLD vs. Junction Temperature 4.40 4.35 4.30 trecovery (s) tBO(BLANK) (ms) 53.0 4.25 4.20 4.15 4.10 4.
PAGE 15
NCL30081 Application Information • Brown−Out: the controller includes a brown−out The NCL30081 implements a current−mode architecture operating in quasi−resonant mode. Thanks to proprietary circuitry, the controller is able to accurately regulate the secondary side current of the flyback converter without using any opto−coupler or measuring directly the secondary side current.
PAGE 16
NCL30081 Constant Current Control (DCM). Figure 42 shows the basic circuit of a flyback converter. Figure 43 portrays the primary and secondary current of a flyback converter in discontinuous conduction mode Transformer Vbulk Lleak Cclp Nsp Rclp . Lp . Clamping network DRV Clump Rsense Figure 42. Basic Flyback Converter Schematic http://onsemi.
PAGE 17
NCL30081 During the on−time of the MOSFET, the bulk voltage Vbulk is applied to the magnetizing and leakage inductors Lp and Lleak and the current ramps up. When the MOSFET is turned−off, the inductor current first charges Clump. The output diode is off until the voltage across Lp reverses and reaches: N spǒV out ) V fǓ turned off, the drain voltage begins to oscillate because of the resonating network formed by the inductors (Lp+Lleak) and the lump capacitor.
PAGE 18
NCL30081 Internal Soft−Start At startup or after recovering from a fault, there is a small internal soft−start of 40 ms. In addition, during startup, as the output voltage is zero volts, the demagnetization time is long and the constant current control block will slowly increase the peak current towards its nominal value as the output voltage grows. Figure 44 shows a soft−start simulation example for a 9 W LED power supply. 16.0 (V) 12.0 1 Vout 2 I out 4 VControl 3 VCS 8.00 4.
PAGE 19
NCL30081 S CS LEB1 Rsense + Vcontrol DRV Q Q latch R Vcc management PWMreset VCC − + VCCstop UVLO grand 8_HICC reset Ipkmax − VILIMIT LEB2 aux Vdd OVP + STOP WOD_SCP − S VCS(stop) Q Q OVP OFF WOD_SCP latch S Q Q R 8_HICC R grand reset from Fault Management Block Figure 45. Winding Short Circuit Protection, Max.
PAGE 20
NCL30081 Vbulk Vbulk(on) Vbulk(off) VCC VCC(on) VCC(off) VCC(reset) BO comp Iout 100% 70% 40% 25% Figure 47. Step Dimming Chronograms http://onsemi.
PAGE 21
NCL30081 VCC Over Voltage Protection (Open LED Protection) In the NCL30081, when the VCC voltage reaches the VCC(OVP) threshold, the controller stops the DRV pulses and the 4−s timer starts counting. The IC re−start switching after the 4−s timer has elapsed as long as VCC ≥ VCC(on). This is illustrated in Figure 48. If no output load is connected to the LED power supply, the controller must be able to safely limit the output voltage excursion. 40.0 V CC(OVP) (V) 30.0 1 V CC VCC(on) 20.0 10.
PAGE 22
NCL30081 Vbulk VIN + LLine HLine 25−ms blanking time − 2.4 V if LLine low 2.3 V if LLine high Figure 49. Line Range Detection Table 5. VALLEY SELECTION VIN pin voltage for valley change Iout value at which the controller changes valley (Iout decreasing) 0 100% 75% 50% 30% 15% 6% 0% 0 −LL− 2.3 V −HL− 1st 2nd 2nd 3rd 4th 5th 7th 8th 11th 12th 13th 15th −LL− 2.4 V −HL− VVIN increases VIN pin voltage for valley change http://onsemi.
PAGE 23
NCL30081 Zero Crossing Detection Block the valleys. To avoid such a situation, the NCL30081 features a Time−Out circuit that generates pulses if the voltage on ZCD pin stays below the VZCD(THD) threshold for 6.5 ms. The time−out also acts as a substitute clock for the valley detection and simulates a missing valley in case of too damped free oscillations. The ZCD pin allows detecting when the drain−source voltage of the power MOSFET reaches a valley.
PAGE 24
NCL30081 Line Feed−forward Because of internal and external propagation delays, the MOSFET is not turned−off immediately when the current set−point is reached. As a result, the primary peak current is slightly higher than expected resulting in a small output current error which can be compensated for during component selection. Normally this error would increase if the input line voltage increased because the slew rate through the primary inductance would increase.
PAGE 25
NCL30081 160 (V) 120 VBulk 80.0 1 40.0 0 18.0 (V) 2 VCC(on) 16.0 14.0 VCC 12.0 VCC(off) 10.0 1.10 V BO(on) (V) 900m V BO(off) 700m V pinVIN 500m 3 300m 8.00 50−ms Timer (V) 6.00 BO_NOK low => Startup mode 4.00 2.00 BO_NOK 4 0 46.1m 138m 231m time in seconds 323m Figure 53. Brown−Out Chronograms (Valley Fill circuit is used) http://onsemi.
PAGE 26
NCL30081 CS Pin Short Circuit Protection Normally, if the CS pin or the sense resistor is shorted to ground, the Driver will not be able to turn off, leading to potential damage of the power supply. To avoid this, the NCL30081 features a circuit to protect the power supply against a short circuit of the CS pin. When the MOSFET is on, if the CS voltage stays below VCS(low) after the adaptive blanking timer has elapsed, the controller shuts down and will attempt to restart on the next VCC hiccup.
PAGE 27
NCL30081 Reset Timer has finished counting VCC > VCC(on) VCC < VCC(off) or BO_NOK ↓ VCC_OVP BO_NOK high or TSD or CS_Short Stop 4−s Timer VCC Disch. BO_NOK high or TSD or CS_Short WOD_SCP or Aux_SCP or VCC_OVP Run With states: Reset Stop Run VCC Disch.
PAGE 28
NCL30081 Reset Timer has finished counting VCC > VCC(on) VCC < VCC(off) or BO_NOK ↓ VCC < VCC(reset) 4−s Timer VCC_OVP BO_NOK high or TSD or CS_Short Stop VCC Disch. VCC_OVP BO_NOK high or TSD or CS_Short Latch Run WOD_SCP or Aux_SCP With states: Reset Stop Run VCC Disch.
PAGE 29
NCL30081 PACKAGE DIMENSIONS TSOP−6 CASE 318G−02 ISSUE V D H 6 5 ÉÉ E1 1 NOTE 5 2 L2 4 GAUGE PLANE E 3 L b DETAIL Z e 0.05 A1 M A C NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. DIMENSIONS D AND E1 DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. MOLD FLASH, PROTRUSIONS, OR GATE BURRS SHALL NOT EXCEED 0.15 PER SIDE.
PAGE 30
NCL30081 OPTIONS Controller Output SCP Winding/Output Diode SCP NCL30081A Latched Latched NCL30081B Auto−recovery Auto−recovery ORDERING INFORMATION Device Package Marking Package Type Shipping† NCL30081ASNT1G AAG TSOP−6 (Pb−Free, Halide−Free) 3000 / Tape & Reel NCL30081BSNT1G AAH TSOP−6 (Pb−Free, Halide−Free) 3000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure