NCV3066DR2G - ON Semiconductor - Datasheet.Directory

January, 2009 − Rev. 3

1Publication Order Number:

NCP3066/D

NCP3066, NCV3066

Up to 1.5 A Constant

Current Switching

Regulator for LEDs with

ON/OFF Function

The NCP3066 is a monolithic switching regulator designed to

deliver constant current for powering high brightness LEDs. The

device has a very low feedback voltage of 235 mV (nominal) which is

used to regulate the average current of the LED string. In addition, the

NCP3066 has a wide input voltage up to 40 V to allow it to operate

from a 12 Vac or a 12−36 Vdc supply, commonly used for lighting

applications as well as unregulated supplies such as rechargeable

batteries. The NCP3066 switching regulator can be configured in

Step−Down (Buck), Step−Up (Boost) and Voltage−Inverting

topologies with a minimum number of external components. The

ON/OFF pin provides PWM dimming capability or a low power

shutdown mode.

Features

•Integrated 1.5 A Switch

•Input Voltage Range from 3.0 V to 40 V

•Logic Level Shutdown Capability

•Low Feedback Voltage of 235 mV

•Cycle−by−Cycle Current Limit

•No Control Loop Compensation Required

•Frequency of Operation Adjustable up to 250 kHz

•Analog and Digital PWM Dimming Capability

•Internal Thermal Shutdown with Hysteresis

•NCV Prefix for Automotive and Other Applications Requiring Site

and Control Changes

•These are Pb−Free Devices

Applications

•Automotive and Marine Lighting

•Constant Current Source, High Brightness LED Driver

•Low Voltage and Landscape Lighting

ON/OFF

Ipk

COMP

SWC

SWE

GND

ÇÇ

VCC

ON/OFF

VCC

GND

CIN

LED−

LED+

Rsense

NCP3066

COUT

LED1

LEDn

Figure 1. Typical Buck Application Circuit

PDIP−8

P, P1 SUFFIX

CASE 626

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MARKING

DIAGRAMS

DFN8

MN SUFFIX

CASE 488AF

SOIC−8

D SUFFIX

CASE 751

NCP3066

AWL

YYWWG

NCP3066 = Specific Device Code

A = Assembly Location

L, WL = Wafer Lot

Y, YY = Year

W, WW = Work Week

G or G= Pb−Free Package

(Note: Microdot may be in either location)

See detailed ordering and shipping information in the package

dimensions section on page 17 of this data sheet.

ORDERING INFORMATION

ALYWG

83066

ALYWG

3066

NCP3066, NCV3066

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Figure 2. Pin Connections

Timing Capacitor

Comparator

Inverting

Input

VCC

ON/OFF

Ipk Sense

GND

Switch Emitter

Switch Collector

(Top View)

ÇÇ

Comparator

Inverting

Input

VCC

ON/OFF

Ipk Sense

Timing Capacitor

GND

Switch Emitter

Switch Collector

(Top View)

Figure 3. Pin Connections

NOTE: EP Flag must be tied to GND Pin 4 on PCB

EP Flag

SOIC−8/PDIP−8 DFN8

Figure 4. Block Diagram

−

7Comparator

CT 3

8TSD

0.2 V

−

Switch Collector

Switch Emitter

Timing Capacitor

GND

Comparator Inverting Input

VCC

Ipk Sense

ON/OFF

Oscillator

0.235V

Reference

Regulator

ON/OFF

Bias

Comparator

PIN DESCRIPTION

Pin No.

Pin Name Description

PDIP8 DFN8

1 1 Switch Collector Internal Darlington switch collector.

2 2 Switch Emitter Internal Darlington switch emitter.

3 3 Timing Capacitor Timing Capacitor to control the switching frequency.

44, EP Flag GND Ground pin for all internal circuits.

5 5 Comparator Inverting Input Inverting input pin of internal comparator.

6 6 VCC Voltage Supply

7 7 Ipk Sense Peak Current Sense Input to monitor the voltage drop across an external

resistor to limit the peak current through the circuit.

8 8 ON/OFF ON/OFF Pin. To disable the device, this input should be pulled below

0.8 V. If the pin is left floating, it will be disabled.

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MAXIMUM RATINGS (measured vs. Pin 4, unless otherwise noted)

Rating Symbol Value Unit

VCC Pin 6 VCC 0 to +42 V

Comparator Inverting Input Pin 5 VCII −0.3 to + VCC V

Darlington Switch Collector Pin 1 VSWC −0.3 to + 42 V

Darlington Switch Emitter Pin 2 (Transistor OFF) VSWE −0.6 to + VCC V

Darlington Switch Collector to Emitter Pins 1−2 VSWCE −0.3 to + 42 V

Darlington Switch Current ISW 1.5 A

Ipk Sense Pin 7 VIPK −0.3 to VCC+ 0.3 V

Timing Capacitor Pin Voltage (Pin 3) VTC −0.2 to +1.4 V

Moisture Sensitivity Level MSL 1 −

Lead Temperature Soldering TSLD 260 °C

ON/OFF Pin voltage VON/OFF (−0.3 to +25) < VCC V

POWER DISSIPATION AND THERMAL CHARACTERISTICS

PDIP−8 (Note 5)

Thermal Resistance Junction−to−Air

RqJA 100

°C/W

SOIC−8 (Note 5)

Thermal Resistance Junction−to−Air

RqJA 180

°C/W

DFN−8 (Note 5)

Thermal Resistance Junction−to−Air

Thermal Resistance Junction−to−Case

RqJA

RqJC

°C/W

Storage Temperature Range TSTG −65 to +150 °C

Maximum Junction Temperature TJMAX +150 °C

Operating Junction Temperature Range (Note 3)

NCP3066

NCV3066

TJ0 to +85

−40 to +125

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. This device series contains ESD protection and exceeds the following tests:

Pin 1−8: Human Body Model 2000 V per AEC Q100−002; 003 or JESD22/A114; A115

Machine Model Method 200 V

2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.

3. The relation between junction temperature, ambient temperature and Total Power dissipated in IC is TJ = TA + Rq • PD.

4. The pins which are not defined may not be loaded by external signals.

5. 35 mm copper, 10 cm2 copper area.

NCP3066, NCV3066

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ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, −40°C < TJ < +125°C for NCV3066, 0°C < TJ < +85°C for NCP3066 unless

otherwise specified)

Symbol Characteristic Conditions Min Typ Max Unit

OSCILLATOR

fOSC Frequency (VPin5 = 0 V, CT = 2.2 nF,

TJ = 25°C)

110 150 190 kHz

IDISCHG/ICHG Discharge to Charge Current Ratio (Pin 7 to VCC, TJ = 25°C) 5.5 6.0 6.5 −

IDISCHG Capacitor Discharging Current (Pin 7 to VCC, TJ = 25°C) 1650 mA

ICHG Capacitor Charging Current (Pin 7 to VCC, TJ = 25°C) 275 mA

VIPK(Sense) Current Limit Sense Voltage (TJ = 25°C) (Note 7) 165 200 235 mV

OUTPUT SWITCH (Note 6)

VSWCE(DROP) Darlington Switch Collector to

Emitter Voltage Drop

(ISW = 1.0 A, TJ = 25°C)

(Note 6)

1.0 1.3 V

IC(OFF) Collector Off−State Current (VCE = 40 V) 1.0 10 mA

COMPARATOR

VTH Threshold Voltage TJ = 25°C 235 mV

TJ = 0°C to 85°C−5% 235 +5%

TJ = −40°C to +125°C−10% 235 +10%

REGLiNE Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) −6.0 2.0 6.0 mV

ICII in Input Bias Current (Vin = Vth)−1000 −100 1000 nA

ON/OFF FEATURE

VIH ON/OFF Pin Logic Input Level High

VOUT = 0 V

TJ = 25°C

TJ = 0°C to +85°C

2.2

2.4

−

VIL ON/OFF Pin Logic Input Level Low

VOUT = Nominal Output Voltage J = 25°C

TJ = 0°C to +85°C

−

1.0

0.8

IIH ON/OFF Pin Input Current

ON/OFF Pin = 5 V (ON)

TJ = 25°C 15 mA

IIL ON/OFF Pin Input Current

ON/OFF Pin = 0 V (OFF)

TJ = 25°C 1.0 mA

TON_MIN ON/OFF Pin Minimum Width TJ = 25°C 50 ms

TOTAL DEVICE

ICC Supply Current (VCC = 5.0 V to 40 V,

CT = 2.2 nF, Pin 7 = VCC,

VPin 5 > Vth, Pin 2 = GND,

remaining pins open)

7.0 mA

ISTBY Standby Quiescent Current ON/OFF Pin = 5.0 V (OFF)

TJ = 25°C

TJ = −40°C to +125°C

85 120

120

TSHD Thermal Shutdown Threshold 160 °C

TSHDHYS Hysteresis 10 °C

6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

7. The VIPK (Sense) Current Limit Sense Voltage is specified at static conditions. In dynamic operation the sensed current turn−off value

depends on comparator response time and di/dt current slope. See the Operating Description section for details.

8. NCV prefix is for automotive and other applications requiring site and change control and extended operating temperature conditions.

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Figure 5. Oscillator Frequency vs.

Timing Capacitor

Figure 6. Oscillator Frequency vs. Supply

Voltage

Ct, CAPACITANCE (nF) VIN, INPUT VOLTAGE (V)

Figure 7. Voltage Drop in Emitter Follower

Configuration

Figure 8. Common Emitter Configuration Output

Darlington Switch Voltage Drop vs. Temperature

TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C)

FREQUENCY (kHz)

VOLTAGE DROP (V)

0.9

1.1

1.3

1.5

1.7

1.9

2.1

2.3

−40 −20 0 20 40 60 80 100 140

ICE = 1 A

ICE = 1.25 A

ICE = 0.75 A

ICE = 0.5 A

ICE = 0.25 A

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

ICE = 1.25 A

ICE = 1 A

ICE = 0.75 A

ICE = 0.25 A

ICE = 0.5 A

−40 −20 0 20 40 60 80 100 120

100

150

200

250

300

350

0 2 4 6 8 101214161820 120

125

130

135

140

145

150

0 5 10 15 20 25 30 35 40

120 140

Figure 9. Vth vs. Temperature Figure 10. Current Limit Sense Voltage vs.

Temperature

TJ, JUNCTION TEMPERATURE (°C) TJ, JUNCTION TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

Vipk, CURRENT LIMIT SENSE VOLTAGE (V)

0.230

0.232

0.234

0.236

0.238

0.240

−40 −20 0 20 40 60 80 100 120 140

0.170

0.175

0.180

0.185

0.190

0.195

0.200

−40 −20 0 20 40 60 80 100 140120

NCP3066, NCV3066

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100

150

200

250

300

350

400

450

0 5 10 15 20 25 30 35 40

Vin, INPUT VOLTAGE (V)

Figure 11. Standby Supply Current vs. Supply Voltage

STANDBY SUPPLY CURRENT (mA)

NCP3066, NCV3066

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INTRODUCTION

The NCP3066 is a monolithic power switching regulator

optimized for LED Driver applications. Its flexible

architecture enables the system designer to directly

implement step−up, step−down, and voltage−inverting

converters with a minimum number of external components

for driving LEDs. A representative block diagram is shown

in Figure 3.

Operating Description

The NCP3066 operates as a fixed oscillator frequency

output voltage ripple gated regulator. In general, this mode

of operation is somewhat analogous to a capacitor charge

pump and does not require dominant pole loop

compensation for converter stability. The typical operating

waveforms are shown in Figure 12. The output voltage

waveform is shown for a step−down converter with the

ripple and phasing exaggerated for clarity. During initial

converter startup, the feedback comparator senses that the

output voltage level is below nominal. This causes the

output switch to turn on and off at a frequency and duty cycle

controlled by the oscillator, thus pumping up the output filter

capacitor. When the output voltage level reaches nominal

comparator value, the output switch cycle is inhibited. When

the load current causes the output voltage to fall below the

nominal value feedback comparator enables switching

immediately. Under these conditions, the output switch

conduction can be enabled for a partial oscillator cycle, a

partial cycle plus a complete cycle, multiple cycles, or a

partial cycle plus multiple cycles.

Oscillator

The oscillator frequency and off−time of the output switch

are programmed by the value of the timing capacitor CT. The

capacitor CT is charged and discharged by a 1 to 6 ratio

internal current source and sink, generating a positive going

sawtooth waveform at Pin 3. This ratio sets the maximum

tON/(tON + tOFF) of the switching converter as 6/(6+1) or

85.7% (typical). The oscillator peak and valley voltage

difference is 500 mV typically. To calculate the CT capacitor

value for required oscillator frequency, use the equations

found in Figure 15. An online NCP3066 design tool can be

found at www.onsemi.com, which aids in selecting

component values.

Figure 12. Typical Operating Waveforms

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Peak Current Sense Comparator

Under normal conditions, the output switch conduction is

initiated by the Voltage Feedback comparator and

terminated by the oscillator. Abnormal operating conditions

occur when the converter output is overloaded or when

feedback voltage sensing is lost. Under these conditions, the

Ipk Current Sense comparator will protect the Darlington

output Switch. The switch current is converted to a voltage

by inserting a fractional ohm resistor, RSense, in series with

VCC and Darlington output switch. The voltage drop across

RSense is monitored by the Current Sense comparator. If the

voltage drop exceeds 200 mV (nom) with respect to VCC, the

comparator will set the latch and terminate the output switch

conduction on a cycle−by−cycle basis.

Real

Vturn−off on

Rs Resistor

t_delay

di/dt slope I through the

Darlington

Switch

Vipk(sense)

Figure 13. Current Sense Waveform

The VIPK(Sense) Current Limit Sense Voltage threshold is

specified at static conditions. In dynamic operation the

sensed current turn−off value depends on comparator

response time and di/dt current slope.

Real Vturn−off on Rsc resistor

Vturn_off = Vipk(sense) + RSense*(tdelay*di/dt)

Typical Ipk comparator response time tdelay is 350 ns. The

di/dt current slope is dependent on the voltage difference

across the inductor and the value of the inductor. Increasing

the value of the inductor will reduce the di/dt slope.

It is recommended to verify the actual peak current in the

application at worst conditions to be sure that the max peak

current will never get over the 1.5 A Darlington Switch

Current max rating.

Thermal Shutdown

Internal thermal shutdown circuitry is provided to protect

the IC in the event that the maximum junction temperature

is exceeded. When activated, typically at 160°C, the

Darlington Output Switch is disabled. The temperature

sensing circuit is designed with some hysteresis. The

Darlington Switch is enabled again when the chip

temperature decreases under the low threshold. This feature

is provided to prevent catastrophic failures from accidental

device overheating. It is not intended to be used as a

replacement for proper heatsinking.

Output Switch

The output switch is designed in Darlington

configuration. This allows the application designer to

operate at all conditions at high switching speed and low

voltage drop. The Darlington Output Switch is designed to

switch a maximum of 40 V collector to emitter voltage and

current up to 1.5 A.

ON/OFF Function

The ON/OFF function provides interruption of switching

and puts the circuitry into the low consumption mode. This

feature is applicable for digital dimming of the LEDs as

well. The ON/OFF signal inhibits switching of the regulator

and reduces the average current through the LEDs. The

frequency of this pulse width−modulated signal with the

duty cycle can range from less than 1% to 100% is limited

by the value of 1 kHz.

Pulling this pin below 0.8 V or leaving it opened turns the

regulator off. In this state the consumption of the device is

reduced below 100 uA. Pulling this pin above 2.4 V (up to

max. 25 V) allows the regulator running in normal state. If

the ON/OFF feature is not needed, the ON/OFF pin can be

wired to VCC, provided this voltage does not exceed 25 V.

No Output Capacitor Operation

A traditional buck topology includes an inductor followed

by an output capacitor which filters the ripple. The capacitor

is placed in parallel with the LED or array of LEDs to lower

the ripple current. A constant current buck regulator such as

the NCP3066 focuses on the control of the current through

the load, not the voltage across it. The switching frequency

of the NCP3066 is in the range of 100−250 kHz which is

much higher than the human eye can detect. By configuring

the NCP3066 in a continuous conduction buck

configuration with low peak to peak ripple the output filter

capacitor can be eliminated. The important design

parameter is to keep the peak current below the maximum

current rating of the LED. Using 15−40% peak to peak ripple

results in a good compromise between achieving max

average output current without exceeding the maximum

limit. This saves space and reduces part count for

applications.

NCP3066, NCV3066

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APPLICATIONS

Figures 15 through 24 show the simplicity and flexibility

of the NCP3066. Two main converter topologies are

demonstrated with actual test data shown below each of the

circuit diagrams. The demo boards have an input for a digital

dimming signal. You can provide a PWM signal to change

the average output current and reduce the LED brightness.

Figure 14 gives the relevant design equations for the key

parameters. Additionally, a complete application design aid

for the NCP3066 can be found at www.onsemi.com.

Parameter Step−Down Step−Up

ǒton

toffǓVout )VF

Vin *VSWCE *Vout

Vout )VF*Vin

Vin *VSWCE

ton ton

toff

f ǒton

toff )1Ǔ

ton

toff

f ǒton

toff )1Ǔ

CTCT+381.6 @10*6

fosc *343 10*12

IL(avg) Iout Iout ǒton

toff )1Ǔ

Ipk (Switch) IL(avg) )DIL

2IL(avg) )DIL

RSC 0.20

Ipk (Switch)

0.20

Ipk (Switch)

LǒVin *VSWCE *Vout

DILǓ ton ǒVin *VSWCE

DILǓ ton

Vripple(pp)

DILǒ1

8fCOǓ2

)(ESR)2

Ǹton Iout

CO)DIL ESR

Iout Vref

Vref

9. VSWCE − Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 7 and 8.

10.VF − Output rectifier forward voltage drop. Typical value for 1N5819 Schottky barrier rectifier is 0.4 V.

11. The calculated ton/toff must not exceed the minimum guaranteed oscillator charge to discharge ratio.

Figure 14. Design Equations

The Following Converter Characteristics Must Be Chosen:

Vin − Nominal operating input voltage.

Vout − Desired output voltage.

Iout − Desired output current.

DIL − Desired peak−to−peak inductor ripple current. For maximum output current it is suggested that DIL be chosen to be

less than 10% of the average inductor current IL(avg). This will help prevent Ipk (Switch) from reaching the current limit threshold

set by RSC. If the design goal is to use a minimum inductance value, let DIL = 2(IL(avg)). This will proportionally reduce

converter output current capability.

f − Maximum output switch frequency.

Vripple(pp) − Desired peak−to−peak output ripple voltage. For best performance the ripple voltage should be kept to a low

value since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR)

electrolytic designed for switching regulator applications.

NCP3066, NCV3066

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Figure 15. Buck Demoboard with External Switch Application Schematic

ON/OFF

Ipk

COMP

SWC

SWE

GND

VCC

ON/OFF

VIN

GND

+LED

NCP3066

SOIC

R16

R68 C7

R10

10k

Input

−LED

R11

1k0

100p

IC1

C10 R19

2n2

R1 ... R9

...

220 mF

9 x 0R15

1n8

m15 100nF

R17

R33

R15

1k0

R12

12k

1k0

0.1 mF

Table 1. BILL OF MATERIALS

Desig-

nator Qty Description Value

Toler-

ance Footprint Manufacturer

Manufacturer

Part Number

R1;R2;

R3;R4

4 Resistor 0.15R 1% 1206 Susumu RL1632R-R150-F

R10 1 Resisitor 10k 1% 1206 Rohm MCR18EZHF1002

R11;

R15

2 Resisitor 1k 1% 1206 Rohm MCR18EZPF1001

R12 NU Resistor 12k 1% 1206 Rohm MCR18EZHF1202

R16 1 Resistor 0.68R 5% 1210 Panasonic - ECG ERJ-14RQJR68U

R17 OPTION Resistor 0.33R 5% 1210 Panasonic - ECG ERJ-14RQJR33U

R19 1 Resistor 1k 5% 1210 Panasonic - ECG ERJ-14YJ102U

C1 1 Capacitor 220mF/35V 20% 10x12.5 Panasonic EEUFC1V221

C2;C7 2 Capacitor 100nF 10% 1206 Kemet C1206C104K5RACTU

C5 1 Capacitor 1.8nF 10% 1206 Kemet C1206C182K5RACTU

C8 1 Capacitor 150mF/16V 20% F8 SANYO 16SP150M

C9 1 Capacitor 100pF 10% 1206 Vishay/Vitramon VJ1206Y101KXEAT5Z

C10 1 Capacitor 2.2nF 10% 1206 Kemet C1206C222K5RACTU

Q1 1 Power MOSFET

−25A, -30V

NTD18P03L - DPAK ON Semiconductor NTD18P03L

Q2 1 Switching NPN

Transistor

MMBT489LT1G - SOT-23 ON Semiconductor MMBT489LT1G

D2 1 1A, 30V Schottky

Rectifier

MBR130T1G - SOD123 ON Semiconductor MBR130T1G

IC1 1 Switching

Regulator

NCP3066DR2G - SOIC-8 ON Semiconductor NCP3066DR2G

D1 1 3A, 30V Schottky

Rectifier

MBRS330T3G - SMC ON Semiconductor MBRS330T3G

L1 1 Inductor 47 mH20% Wurth

Elektronik

Wurth Elektronik WE−PD4 74457147

NCP3066, NCV3066

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Figure 16. Buck with External Switch Demoboard Layout Figure 17. Buck with External Switch Demoboard

Photo

350 mA 2 LED

(Vout = 6.4 V)

Figure 18. Efficiency of Buck LED Driver

INPUT VOLTAGE (V)

EFFICIENCY (%)

700 mA 2 LED

(Vout = 6.4 V)

350 mA 4 LED

(Vout = 12.8 V)

700 mA 4 LED

(Vout = 12.8 V)

Figure 19. Efficiency of Buck LED Driver at Iout = 3 A

10 15 20 25 30 35

INPUT VOLTAGE (V)

EFFICIENCY (%)

10 15 20 25 30 35

3 A 4 LED

(Vout = 12.8 V)

3 A 2 LED

(Vout = 6.4 V)

Figure 15, Buck Demoboard With External Switch

Application Schematic illustrates the NCP3066 being used

as a PFET controller. Table 1. Bill Of Materials shows the

small number of additional parts which are necessary to

assemble mentioned demoboard. The demoboard based on

two layer PCB and the layout is mentioned in Figure 16.

Buck Demoboard Layout. The Line regulation is mentioned

in Figure 20, Line Regulation. The Figure 21, Dimming

characteristic shows behavior of circuitry in case the square

wave signal with 5 V amplitude and 300 Hz frequency was

delivered into ON/OFF pin of device.

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Figure 20. Line Regulation

INPUT VOLTAGE (V)

OUTPUT CURRENT (A)

Iout = 600 mA

0.05

0.10

0.15

0.20

0.25

0.30

0.35

5102030405060708090100

Vin = 10 V − 15 V

Vin = 25 V

Figure 21. Dimming Characteristic

ON/OFF PIN DUTY CYCLE (%)

Pled (W)

0.10

0.20

0.30

0.40

0.50

0.60

0.70

8 1012141618202224262830

Iout = 450 mA

Iout = 300 mA

Iout = 150 mA

Table 2. TEST RESULTS

Line Regulation Vin = 12 V to 35 V, Iout = 3000 mA 250 mA

Output Ripple Vin = 12 V, Iout = 3000 mA 320 mA

Efficiency Vin = 12 V, Iout = 3000 mA 80%

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ON/OFF

Ipk

COMP

SWC

SWE

GND

VCC

ON/OFF

VIN

GND

100n

+LED

NCP3066

SOIC

R68

m18

R15

10k

100mH

2n2

100R

Input

−LED

100R

1k0

3 x 100mF

IC1

Figure 22. Boost demoboard Application Schematic

C5C6

Table 3. BILL OF MATERIALS

Designator Qty Description Value

Toler-

ance

Foot-

print Manufacturer

Manufacturer

Part Number

R1 1 Resistor 0.15R 1% 1206 Susumu RL1632R-R150-F

R2;R4 NU Resisitor 100R 1% 1206 Vishay/Dale CRCW1206100RFKEA

R3 1 Resisitor 1k 1% 1206 Rohm MCR18EZPF1001

R5 1 Resistor 0.68R 5% 1210 Panasonic - ECG ERJ-14RQJR68U

R6 1 Resistor 10k 1% 1206 Rohm MCR18EZHF1002

C1 1 Capacitor 180mF20% F8 SANYO 16SVPS180M

C2 1 Capacitor 100nF 10% 1206 Kemet C1206C104K5RACTU

C3 1 Capacitor 2.2nF 10% 1206 Kemet C1206C222K5RACTU

C4,C5,C6 3 Capacitor 100mF20% 1210 TDK C4532Y5V1A107Z

C10 1 Capacitor 2.2nF 10% 1206 Kemet C1206C222K5RACTU

IC1 1 Switching

Regulator

NCP3066DR2G - SOIC-8 ON Semiconductor NCP3066DR2G

D1 1 Diode MBRS1540T3G - SMB ON Semiconductor MBRS1540T3G

D2 1 Zener Diode BZX84B18VLT1G - SOT-23 ON Semiconductor BZX84B18VLT1G

L2 1 Inductor 100mH20% Coilcraft Coilcraft DO3316P-104MLB

NCP3066, NCV3066

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Figure 23. Boost Demoboard Layout Figure 24. Boost Demonstration Photo

5 7 9 11 13 15 17 19

Figure 25. Boost LED Driver Efficiency

INPUT VOLTAGE (V)

EFFICIENCY (%)

150 mA 8 LED

(25.6 V)

150 mA 6 LED

(19.2 V)

Figure 22, Boost Demoboard Application Schematic,

illustrates the basic circuitry in boost topology, which allows

supplying string up to eight LEDs up to 150 mA

consumption. Table 3, Bill of Materials shows the small

number of additional parts which are necessary to assembly

mentioned demoboard. The demoboard based on one layer

PCB and the layout is shown in Figure 23, Buck Demoboard

Layout. The photo of this demoboard is mentioned in

Figure 24, Boost Demoboard Photo. Figure 26, Dimming

Characteristic shows behavior of circuitry in case the square

wave signal with 5 V amplitude and 300 Hz frequency was

delivered into ON/OFF pin of device. There was tested eight

LEDs string with 150 mA consumption and VIN = 10 V at

room temperature.

The efficiency of this demoboard is mentioned in

Figure 25. Efficiency of Boost LED Driver.

0.50

1.0

1.50

2.0

2.50

3.0

3.50

0 102030405060708090100

Figure 26. Dimming Characteristic

ON/OFF DUTY CYCLE (%)

LED POWER (W)

Table 4. TEST RESULTS

Line Regulation Vin = 10 V to 20 V, Vout = 19.2 V, Iout = 350 mA 25 mA

Output Ripple Vin = 10 V to 20 V, Vout = 19.2 V, Iout = 350 mA 55 mA

Efficiency Vin = 12 V, Vout = 19.2 V, Iout = 350 mA 85%

NCP3066, NCV3066

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Vcc

GND

Ipk

COMP

GND

SWE

SWC

−LED

+LED

C10

NCP3066 SOIC

C2 IC1 C3 C4 C5

Input

R6 R7

12k

100R

R68

1k0

10k R15 100R

2n2

Figure 27. Buck Demoboard Application Schematic

ON/OFF

VIN

0.1 mF

330 mF

47 mH

3 x 100 mF

Table 5. BILL OF MATERIALS

Designator Qty. Description Value Tolerance Footprint Manufacturer

Manufacturer Part

Number

R1 1 Resistor 0.15R 1% 1206 Susumu RL1632R-R150-F

R2; R5 NU Resisitor 100R 1% 1206 Vishay/Dale CRCW1206100RFKEA

R3 1 Resisitor 1 k 1% 1206 Rohm MCR18EZPF1001

R4 1 Resistor 0.68R 5% 1210 Panasonic - ECG ERJ-14RQJR68U

R6 1 Resisitor 10 k 1% 1206 Rohm MCR18EZHF1002

R7 NU Resisitor 12 k 1% 1206 Rohm MCR18EZPF1202

C1 1 Capacitor 330 mF20% F8 PANASONIC EEEFK1E331GP

C2 1 Capacitor 100 nF 10% 1206 Kemet C1206C104K5RACTU

C3 1 Capacitor 2.2 nF 10% 1206 Kemet C1206C222K5RACTU

C4, C5, C6 3 Capacitor 100 mF20% 1210 TDK C4532Y5V1A107Z

IC1 1 Switching

Regulator

NCP3066 - SOIC8 ON Semiconductor NCP3066DR2G

D1 1 Diode MBRS1504 - SMB ON Semiconductor MBRS1504T3G

D2 1 Zener Diode BZX84C8V2 - SOT23 ON Semiconductor BZX84C8V2LT1G

L1 1 Inductor 47 mH20% DO3316 CoilCraft DO3316P-473MLB

NCP3066, NCV3066

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Figure 28. Buck Demoboard Layout Figure 29. Buck Demonstration Photo

The Figure 27 Buck demoboard Application schematic

illustrates the basic circuitry in buck topology, which allows

supplying one or two LEDs up to 350 mA consumption. The

TABLE 5 BILL OF MATERIALS shows the small number

of additional parts which are necessary to assembly

mentioned demoboard. The demoboard based on one layer

PCB and the layout is mentioned in Figure 28 Buck

Demoboard Layout. The Line regulation is mentioned in

Figure 30 Line Regulation. The Figure 31 shows efficiency

of Buck LED Driver.

Figure 30. Line Regulation Figure 31. Efficiency of Buck LED Driver

INPUT VOLTAGE (V) INPUT VOLTAGE (V)

302520 3515105

0.05

0.10

0.15

0.20

0.25

0.35

0.40

205

OUTPUT CURRENT (mA)

EFFICIENCY (%)

0.30 65

1 LED 100 mA

2 LED 100 mA

1 LED 350 mA

2 LED 350 mA

1 LED 100 mA

1 LED 350 mA

10 15 3025 35

Table 6. TEST RESULTS

Line Regulation Vin = 8 V to 20 V, Vout = 3.2 V, Iout = 350 mA 19 mA

Output Ripple Vin = 8 V to 20 V, Vout = 3.2 V, Iout = 350 mA 32 mA

Efficiency Vin = 12 V, Vout = 3.2 V, Iout = 350 mA 62%

NCP3066, NCV3066

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VIN

ON/OFF

VCC

Ipk

COMP

GND

SWE

SWC

Rsense

NCP3066

IC1

10k

R15

Figure 32. ONOFF Serial Resistor Connection

If the application allows ON/OFF pin to be biased by

voltage and the power supply is not connected to Vcc pin at

the same time, then it is recommended to limit ON/OFF

current by resistor with value 10 kW to protect the NCP3066

device. This situation is mentioned in Figure 32, ON/OFF

Serial Resistor Connection.

This resistor shifts the ON/OFF threshold by about

200 mV to higher value, but the TTL logic compatibility is

kept in full range of input voltage and operating temperature

range.

ORDERING INFORMATION

Device Package Shipping†

NCP3066MNTXG DFN−8

(Pb−Free)

4000 / Tape & Reel

NCP3066PG PDIP−8

(Pb−Free)

50 Units / Rail

NCP3066DR2G SOIC−8

(Pb−Free)

2500 / Tape & Reel

NCV3066MNTXG DFN−8

(Pb−Free)

4000 / Tape & Reel

NCV3066PG PDIP−8

(Pb−Free)

50 Units / Rail

NCV3066DR2G SOIC−8

(Pb−Free)

2500 / 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, BRD8011/D.

NCP3066, NCV3066

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PACKAGE DIMENSIONS

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN

FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR

SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

STYLE 1:

PIN 1. AC IN

2. DC + IN

3. DC - IN

4. AC IN

5. GROUND

6. OUTPUT

7. AUXILIARY

8. VCC

NOTE 2 −A−

−B−

−T−

SEATING

PLANE

0.13 (0.005) B M

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A9.40 10.16 0.370 0.400

B6.10 6.60 0.240 0.260

C3.94 4.45 0.155 0.175

D0.38 0.51 0.015 0.020

F1.02 1.78 0.040 0.070

G2.54 BSC 0.100 BSC

H0.76 1.27 0.030 0.050

J0.20 0.30 0.008 0.012

K2.92 3.43 0.115 0.135

L7.62 BSC 0.300 BSC

M--- 10 --- 10

N0.76 1.01 0.030 0.040

8 LEAD PDIP

CASE 626−05

ISSUE L

NCP3066, NCV3066

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PACKAGE DIMENSIONS

SOIC−8 NB

CASE 751−07

ISSUE AJ

SEATING

PLANE

X 45_

NOTES:

1. DIMENSIONING AND TOLERANCING PER

ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION A AND B DO NOT INCLUDE

MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)

PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR

PROTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.127 (0.005) TOTAL

IN EXCESS OF THE D DIMENSION AT

MAXIMUM MATERIAL CONDITION.

6. 751−01 THRU 751−06 ARE OBSOLETE. NEW

STANDARD IS 751−07.

0.10 (0.004)

DIM

MIN MAX MIN MAX

INCHES

4.80 5.00 0.189 0.197

MILLIMETERS

B3.80 4.00 0.150 0.157

C1.35 1.75 0.053 0.069

D0.33 0.51 0.013 0.020

G1.27 BSC 0.050 BSC

H0.10 0.25 0.004 0.010

J0.19 0.25 0.007 0.010

K0.40 1.27 0.016 0.050

M0 8 0 8

N0.25 0.50 0.010 0.020

S5.80 6.20 0.228 0.244

−X−

−Y−

0.25 (0.010)

−Z−

0.25 (0.010) ZSXS

____

1.52

0.060

7.0

0.275

0.6

0.024

1.270

0.050

4.0

0.155

ǒmm

inchesǓ

SCALE 6:1

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

NCP3066, NCV3066

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PACKAGE DIMENSIONS

8 PIN DFN, 4x4

CASE 488AF−01

ISSUE C

ÉÉ

NOTES:

1. DIMENSIONS AND TOLERANCING PER

ASME Y14.5M, 1994.

2. CONTROLLING DIMENSION: MILLIMETERS.

3. DIMENSION b APPLIES TO PLATED

TERMINAL AND IS MEASURED BETWEEN

0.15 AND 0.30MM FROM TERMINAL TIP.

4. COPLANARITY APPLIES TO THE EXPOSED

PAD AS WELL AS THE TERMINALS.

5. DETAILS A AND B SHOW OPTIONAL

CONSTRUCTIONS FOR TERMINALS.

DIM MIN MAX

MILLIMETERS

A0.80 1.00

A1 0.00 0.05

A3 0.20 REF

b0.25 0.35

D4.00 BSC

D2 1.91 2.21

E4.00 BSC

E2 2.09 2.39

e0.80 BSC

K0.20 −−−

L0.30 0.50

C0.15

TOP VIEW

SIDE VIEW

BOTTOM VIEW

ÇÇ

(A3)

SEATING

PLANE

C0.08

C0.10

ÇÇ

8X L

NOTE 3

0.10 C

0.05 C

PIN ONE

REFERENCE

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

0.63

2.21

2.39

0.80

PITCH

4.30

0.35

DETAIL A

OPTIONAL

CONSTRUCTIONS

ÉÉ

ÇÇ

ÇÇÇ

ÉÉÉ

DETAIL B

MOLD CMPDEXPOSED Cu

ALTERNATE

CONSTRUCTIONS

L1 −−− 0.15

DETAIL B

NOTE 4

DETAIL A

DIMENSIONS: MILLIMETERS

PACKAGE

OUTLINE

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications

intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should

Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,

and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death

associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal

Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

PUBLICATION ORDERING INFORMATION

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USA/Canada

Europe, Middle East and Africa Technical Support:

Phone: 421 33 790 2910

Japan Customer Focus Center

Phone: 81−3−5773−3850

NCP3066/D

LITERATURE FULFILLMENT:

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Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada

Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada

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