ON Semiconductor NCP3065, NCV3065 Technical data

NCP3065, NCV3065

Up to 1.5 A Constant Current
Switching Regulator for LEDs

The NCP3065 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
NCP3065 has a wide input voltage up to 40 V to allow it to operate
from 12 Vac or 12 Vdc supplies commonly used for lighting
applications as well as unregulated supplies such as Lead Acid
batteries. The device can be configured in a controller topology with
the addition of an external transistor to support higher LED currents
beyond the 1.5 A rated switch current of the internal transistor. The
NCP3065 switching regulator can be configured in Step−Down
(Buck) and Step−Up (boost) topologies with a minimum number of
external components.

Features

• Integrated 1.5 A Switch

• Input Voltage Range from 3.0 V to 40 V

• Low Feedback Voltage of 235 mV

• Cycle−by−Cycle Current Limit

• No Control Loop Compensation Required

• Frequency of Operation Adjustable up to 250 kHz

• Operation with All Ceramic Output Capacitors or No Output Capacitance

• Analog and Digital PWM Dimming Capability

• Internal Thermal Shutdown with Hysteresis

• Automotive Version Available

Applications

• Automotive and Marine Lighting

• High Power LED Driver

• Constant Current Source

• Low Voltage LED Lighting

(Landscape, Path, Solar, MR16 Replacement)

+LED

0.15 W

V

in

Rs

C

in

220 mF

NCP3065

NC
I

pk

V

in

FB

= 0.235 V

V

th

SWC
SWE

CT

GND

R

CT

2.2 nF

L

D

C

out

22 mF

Cluster

−LED

R

sense

0.68 W

D

LED

D

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MARKING

DIAGRAMS

8

1

SOIC−8

D SUFFIX

CASE 751

8

1

PDIP−8

P, P1 SUFFIX

CASE 626

8

1

DFN−8

MN SUFFIX

CASE 488

NCP3065 = 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)

3065

ALYWG

G

1

NCP3065

AWL

YYWWG

3065

ALYW G

G

ORDERING INFORMATION

See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.

Figure 1. Typical Buck Application Circuit

© Semiconductor Components Industries, LLC, 2008

October, 2008 − Rev. 1

1 Publication Order Number:

NCP3065/D

NCP3065, NCV3065

Switch Collector

Switch Emitter

Timing Capacitor

GND

2

3

4

Figure 2. Pin Connections

N.C.

Ipk Sense

+V

CC

Comparator Inverting Input

1

(Top View)

8

7

6

5

8

7

6

5

COMPARATOR

N.C.

Sense

I

pk

V

CC

Comparator
Inverting
Input

SET dominant

−

+

0.2 V

COMPARATOR

+

−

NCP3065

R

Q

S

S

Q

R

Switch Collector

Switch Emitter

Timing Capacitor

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

TSD

SET dominant

OSCILLATOR

0.235 V
REFERENCE
REGULATOR

EP Flag

GND

(Top View)

Figure 3. Pin Connections

1

Switch Collector

2

Switch Emitter

3

CT

Timing Capacitor

4

GND

N.C.

Sense

I

pk

V

CC

Comparator
Inverting
Input

Figure 4. Block Diagram

PIN DESCRIPTION

Pin No. Pin Name Description

1 Switch Collector Internal Darlington switch collector

2 Switch Emitter Internal Darlington switch emitter

3 Timing Capacitor Timing Capacitor Oscillator Input, Timing Capacitor

4 GND Ground pin for all internal circuits

5 Comparator

6 V

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

8 N.C. Pin not connected

Inverting Input

CC

Inverting input pin of internal comparator

Voltage supply

current through the circuit

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NCP3065, NCV3065

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

Rating

VCC (Pin 6) V

Comparator Inverting Input (Pin 5) V

Darlington Switch Collector (Pin 1) V

Darlington Switch Emitter (Pin 2) (Transistor OFF) V

Darlington Switch Collector to Emitter (Pins 1−2) V

Darlington Switch Current I

Ipk Sense (Pin 7) V

Timing Capacitor (Pin 3) V

Power Dissipation and Thermal Characteristics

PDIP−8 (Note 5)

Thermal Resistance Junction−to−Air

SOIC−8 (Note 5)

Thermal Resistance Junction−to−Air

DFN−8 (Note 5)

Thermal Resistance Junction−to−Air
Thermal Resistance Junction−to−Case

Storage Temperature Range T

Maximum Junction Temperature T

Operating Junction Temperature Range (Note 3)

NCP3065, NCV3065

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 T

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

5. 1 oz copper, 1 in

2

copper area

Symbol Value Unit

CC

CII

SWC

SWE

SWCE

SW

IPK

TCAP

0 to +40 V

−0.2 to +V

CC

0 to +40 V

−0.6 to +V

CC

0 to +40 V

1.5 A

−0.2 to VCC + 0.2 V

−0.2 to +1.4 V

V

V

°C/W

R

q

JA

100

°C/W

R

q

JA

180

°C/W

R

q

JA

R

q

JC

STG

J(MAX)

T

J

78
14

−65 to +150 °C

+150 °C

°C

−40 to +125

= TA + R

J

•

P

q

D

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NCP3065, NCV3065

ELECTRICAL CHARACTERISTICS (V

Characteristic

= 5.0 V, T

CC

= −40°C to +125°C, unless otherwise specified)

J

Conditions Symbol Min Typ Max Unit

OSCILLATOR

Frequency

(VPin 5 = 0 V, CT = 2.2 nF,

T

= 25°C)

J

Discharge to Charge Current Ratio (Pin 7 to VCC, TJ = 25°C) I

Capacitor Discharging Current (Pin 7 to VCC, TJ = 25°C) I

Capacitor Charging Current (Pin 7 to VCC, TJ = 25°C) I

Current Limit Sense Voltage (TJ = 25°C) (Note 7) V

f

OSC

DISCHG

I

CHG

DISCHG

CHG

IPK(Sense)

110 150 190 kHz

/

5.5 6.0 6.5 −

1650

275

165 185 235 mV

OUTPUT SWITCH (Note 6)

Darlington Switch Collector to

Emitter Voltage Drop

(ISW = 1.0 A,

T

= 25°C) (Note 6)

J

Collector Off−State Current (VCE = 40 V) I

V

SWCE(DROP)

C(OFF)

1.0 1.3 V

0.01 100

COMPARATOR

Threshold Voltage

TJ = 25°C V

TH

235 mV

TJ = 0 to +85°C ±5 %

T

= −40°C to +125°C V

J

Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) REG

Input Bias Current (Vin = Vth) I

CII in

TH

LiNE

−10 +10 %

−6.0 6.0 mV

−1000 −100 1000 nA

TOTAL DEVICE

Supply Current

(VCC = 5.0 V to 40 V,

CT = 2.2 nF, Pin 7 = V

VPin 5 > Vth, Pin 2 = GND,

CC

,

I

CC

7.0 mA

remaining pins open)

Thermal Shutdown Threshold 160 °C

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

V

IPK(Sense)

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

Current Limit Sense Voltage is specified at static conditions. In dynamic operation the sensed current turn−off value depends

8. NCV prefix is for automotive and other applications requiring site and change control.

mA

mA

mA

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NCP3065, NCV3065

450

400

350

300

250

200

150

FREQUENCY (kHz)

100

50

0

0 1 2 3 4 5 6 7 8 9 1011 12 131415161718 1920

Ct, CAPACITANCE (nF) VCC, SUPPLY VOLTAGE (V)

Figure 5. Oscillator Frequency vs. Oscillator

Timing Capacitor

2.4

2.2

2.0

1.8

VCC = 5.0 V
I

= 1 A

E

190

180

170

160

150

140

FREQUENCY (kHz)

130

120

110

Figure 6. Oscillator Frequency vs. Supply

1.25

1.20

1.15

CT = 2.2 nF
T

= 25°C

J

21 34 38

Voltage

VCC = 5.0 V
I

= 1 A

C

402925161273

1.6

1.4

VOLTAGE DROP (V)

1.2

1.0

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

Figure 7. Emitter Follower Configuration Output

Darlington Switch Voltage Drop vs. Temperature

2.0

1.9

VCC = 5.0 V
T

= 25°C

1.8

1.7

1.6

1.5

1.4

1.3

VOLTAGE DROP (V)

1.2

1.1

1.0

J

IE, EMITTER CURRENT (A) IC, COLLECTOR CURRENT (A)

Figure 9. Emitter Follower Configuration Output

Darlington Switch Voltage Drop vs. Emitter Current

1.10

VOLTAGE DROP (V)

1.05

150100500−50

1.0
150100500−50

Figure 8. Common Emitter Configuration Output
Darlington Switch Voltage Drop vs. Temperature

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

VOLTAGE DROP (V)

0.7

0.6

1.51.00.50

0.5

VCC = 5.0 V
T

= 25°C

J

1.51.00.50

Figure 10. Common Emitter Configuration

Output Darlington Switch Voltage Drop vs.

Collector Current

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NCP3065, NCV3065

0.25

0.245

0.24

0.235

0.23

0.225

0.22

, COMPARATOR THRESHOLD VOLTAGE (V)

th

V

0.30

0.28

0.26

0.24

0.22

0.20

0.18

VOLTAGE (V)

, CURRENT LIMIT SENSE

0.16

0.14

ipk(sense)

0.12

V

−10 907050 130

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

1103010 150−30−50

Figure 11. Comparator Threshold Voltage vs.

Temperature

6.0

5.5

5.0

4.5

0.10
20 95 110

Figure 12. Current Limit Sense Voltage vs.

Temperature

65 80

12550355−10−25−40

4.0

3.5

3.0

, SUPPLY CURRENT (mA)

CC

I

2.5

2.0
13 18 23 43

VCC, SUPPLY VOLTAGE (V)

CT = 2.2 nF
Pin 5, 7 = V
Pin 2 = GND

3833288.03.0

CC

Figure 13. Standby Supply Current vs. Supply Voltage

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