Bcr320u_bcr321u Led Driver

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2010-01-151

BCR320U / BCR321U

LED Driver

Features• Continuous output current up to 250mA

with external resistor• Supply voltage up to 24V• Digital PWM input up to 10kHz frequency (BCR321U)• Up to 1W power dissipation in a small SC74 package• Negative thermal coefficient reduces output current

at higher temperatures• Easy paralleling of drivers to increase current• PB-free (RoHS compliant) package• Automotive qualified according to AEC Q101

Applications• Architectural LED lighting• Channel letters for advertising, LED strips for decorative lighting• Retail lighting in fridge, freezer case and vending machines•

Emergency lighting (e.g. steps lighting, exit way signs etc.)

54

63

21

General Description The BCR320U/BCR321U provide a low-cost solution for driving 0.5W LEDs with a typicalLED current ILED of 150mA to 200mA. Internal breakdown voltage is >16V, this is themaximum voltage that the LED driver IC can sustain when the ouput is directly connectedto supply voltage. The BCR320U/BCR321U can be operated at supply voltages of 16V orhigher, by regarding the voltage drop of the LED load, which reduces the supply voltage

to the maximum output voltage of the driver.The enable pin (BCR320) can withstand a maximum voltage of 25 V, which can also beincreased by stacking a series in front of the LED drivers, resulting in a certain voltagedrop of the LEDs, reducing the voltage at the enable pin below 25V.A digital input pin (BCR321U) allows dimming via a Microcontrollerwith frequencies of up to 10 kHz.A reduction of the output current at higher temperatures is the result of the negativetemperature coefficient of 0.2 %/K. of the LED drivers.With no need for additional external components like inductors, capacitors andfree wheeling diodes, the BCR320U/BCR321U LED drivers are a cost-efficient and

PCB-area saving solution for driving 0.5W LEDs.



2010-01-152

BCR320U / BCR321U

Typical ApplicationPin Configuration

BCR321U

Vdrop

Rext

4

6

2,3,51

+Vs

IEN IOUTEN

GND

µC

OUT

6 5 4

1 2 3

Type Marking Pin Configuration Package

BCR320U

BCR321U

30

31

1 = EN 2;3;5 =

OUT

4 = GND 6 = R ext SC74

SC74Maximum Ratings

Parameter Symbol Value Unit

Enable voltage

BCR320U

BCR321U

V EN

25

4.5

V

Output current I out 300 mA

Output voltageV

out16 V

Reverse voltage between all terminals V R 0.5

Total power dissipation, T S = 102 °C P tot 1000 mW

Junction temperature T j 150 °C

Storage temperature T stg -65 ... 150

Thermal Resistance

Parameter Symbol Value Unit

Junction - soldering point 1) R thJS 50 K/W

1For calculation of R thJA please refer to Application Note Thermal Resistance



2010-01-153

BCR320U / BCR321U

Electrical Characteristics at T A=25°C, unless otherwise specified

Parameter Symbol Values Unitmin. typ. max.

Characteristics

Collector-emitter breakdown voltageI C = 1 mA, I B = 0

V BR(CEO) 16 - - V

Enable currentV EN = 12 , BCR320UV EN = 3.3 , BCR321U

I EN

-

-

1.2

1.2

-

-

mA

DC current gainI C = 50 mA, V CE = 1 V

h FE 200 350 500 -

Internal resistorI Rint = 10 mA

R int 65 90 105 Ω

Bias resistor

BCR320U

BCR321U

R B

-

-

10

1.5

-

-

kΩ

Output currentV out = 1.4 V, V EN = 12 V, BCR320UV out = 1.4 V, V EN = 3.3 V, BCR321UV out = 1.4 V, V EN = 12 V, R EXT = 3 Ω ,

BCR320UV out = 1.4 V, V EN = 3.3 , R EXT = 3 Ω ,

BCR321U

I out 8

8

-

-

10

10

250

250

12

12

-

-

mA

Voltage drop ( V Rext )I C = 10 mA

V drop 0.85 0.95 1.05 V

DC Characteristics with stabilized LED load

Lowest sufficient supply voltage overheadI out > 18mA

V Smin - 1.4 - V

Output current change versus T A V EN = 12 V; V out > 2.0 V, BCR320UV EN = 3.3 V; V out > 2.0 V, BCR321U

∆ I out / I out

-

-

-0.2

-0.2

-

-

%/K

Output current change versus V S V EN = 12 V; V out > 2.0 V, BCR320UV EN = 3.3 V; V out > 2.0 V, BCR321U

∆ I out / I out -

-

1

1

-

-

%/V



2010-01-154

BCR320U / BCR321U

Total power dissipation P tot = f (T S )

0 20 40 60 80 100 120 °C 150

TS

0

100

200

300

400

500

600

700

800

900

1000

mW1200

P t o t

Permissible Pulse Load R thJS = f (t p)

10 -6 10 -5 10 -4 10 -3 10 -2 10 0s

T P

-110

010

110

210

310

R t h J S

D = 0,50,20,10,050,020,010,0050

Permissible Pulse LoadP totmax / P totDC = f (t p)

10 -6 10 -5 10 -4 10 -3 10 -2 10 0s

T P

010

110

210

310

-

P t o t m a x / P t o t D C

D = 00.0050.010.020.050.10.20.5



2010-01-155

BCR320U / BCR321U

BCR320U: Output current versus R extI out = f (R ext ); V EN = 12 V;V out = Parameter

10 0 10 1 10 2Ohm

R ext.

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0.22

A0.26

I o u t

Vout = 5.4VVout = 1.4V

BCR320U: Output current versus V outI out = f (V out ); V EN = 12 V;R ext = Parameter

0 2 4 6 8 V 12V out

0

0.1

A

0.3

I o u t

Rext = open

Rext = 20 Ohm

Rext = 10 Ohm

Rext = 6 Ohm

Rext = 4 Ohm

Rext = 3 Ohm

BCR320U: Output current versus V outI out = f (V S ); V EN = 12 V; R ext = open;T A= Parameter

0 2 4 6 8 V 12V out

0

0.005

0.01

A

0.02

I o u t

TA = -40°CTA = 25°CTA = 85°C

BCR320U: Output current versus V outI out = f (V S ); V EN = 12 V; R ext = 20 Ohm;T A= Parameter

0 2 4 6 8 V 12V out

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

A

0.1

I o u t

TA = -40°C

TA = 25°CTA = 85°C



2010-01-156

BCR320U / BCR321U

BCR320U: Output current versus V outI out = f (V S ); V EN = 12 V; R ext = 3 Ohm;T A= Parameter

0 2 4 6 8 V 12V out

0

0.1

0.2

0.3

A

0.5

I o u t

TA = 25°CTA = -40°CTA = 85°C

BCR320U: Output current versus V ENI out = f (V EN); V out = 2.0 V; R ext = open;T A = Parameter

0 5 10 15 V 25V EN

0

0.005

0.01

A

0.02

I o u t

TA = -40°CTA = 25°CTA = 85°C

BCR320U: Output current versus V ENI out = f (V EN); V out = 2.0 V; R ext = 20 Ohm;T A = Parameter

0 5 10 15 V 25V EN

0

0.01

0.02

0.03

0.04

A

0.06

I o u t

TA = -40°CTA = 25°CTA = 85°C


0 5 10 15 V 25V EN

0

0.1

A

0.3

I o u t

TA = 85°CTA = 25°CTA = -40°C



2010-01-157

BCR320U / BCR321U

BCR320U: Enable current versus V ENI EN = f (V EN ); R ext = open; I out = 0;T A = Parameter

0 5 10 15 V 25V EN

0

0.5

1

1.5

2

mA

3

I E N

TA = 80°CTA = 25°CTA = -40°C

BCR320U: Output current versus V ENI out = f (V EN); V out = 2.0 V;R ext = Parameter

0 5 10 15 V 25V EN

0

0.1

A

0.3

I o u t

Rext = open

Rext = 20 Ohm

Rext = 10 Ohm

Rext = 6 Ohm

Rext = 4 Ohm

Rext = 3 Ohm

BCR321U: Output current versus V outI out = f (V out); V EN = 3.3 V;R ext = Parameter

0 2 4 6 8 V 12V out

0

0.1

A

0.3

I o u t

Rext = open

Rext = 20 Ohm

Rext = 10 Ohm

Rext = 6 Ohm

Rext = 4 Ohm

Rext = 3 Ohm

BCR321U: Output current versus R extI out = f (R ext); V EN = 3.3 V;V out = Parameter

10 0 10 1 10 2Ohm

R ext.

0

0.1

0.2

A

0.4

I o u t

Vout = 5.4VVout = 1.4V





2010-01-159

BCR320U / BCR321U


0 1 2 3 V 5V EN

0

0.01

0.02

0.03

0.04

A

0.06

I o u t

TA = -40°CTA = 25°CTA = 85°C


0 1 2 3 V 5V EN

0

0.1

A

0.3

I o u t

TA = 85°CTA = 25°CTA = -40°C

BCR321U: Output current versus V ENI out = f (V EN); V S = 3.3 V;R ext = Parameter

0 1 2 3 4 V 6V EN

0

0.1

A

0.3

I o u t

Rext = open

Rext = 20 Ohm

Rext = 10 Ohm

Rext = 6 Ohm

Rext = 4 Ohm

Rext = 3 Ohm

BCR321U: Enable current versus V ENI EN = f (V EN); R ext = open; I out = 0;T A = Parameter

0 1 2 3 4 V 6V EN

0

1

2

mA

4

I E N

TA = 80°CTA = 25°CTA = -40°C



2010-01-1510

BCR320U / BCR321U

Application circuit:Enabling by connecting to Vs

Application circuit:Enabling / PWM by micro controller

BCR321U

Vdrop

Rext

4

6

2,3,51

+Vs

IEN IOUTEN

GND

µC

OUT

BCR320U

Vdrop

Rext

4

6

+Vs

GND

2,3,5IEN IOUT

EN OUT

Application hints BCR320U / BCR321U serve as an easy to use constant current sources for LEDs.In stand alone application an external resistor can be connected to adjust the current from10 mA to 250 mA. R ext can be determined by using the diagram 'Output current versusexternal resistor'. Please take into account that the resulting output currents will be slightlylower due to the self heating of the component and the negative thermal coefficient.

Please visit our web site for application notes: www.infineon.com/lowcostleddriverfor up-to-date application information



2010-01-1511

BCR320U / BCR321UPackage SC74

Package Out l ine

Foo t P r in t

S tanda rd Pack ing

0.5

0.95

1 . 9

2 . 9

5 46

321

1.1 MAX.

(0.35)(2.25)

±0.22.9 B

0.2+0.1-0.050.35

Pin 1marking

M B 6x0.95

1.9

0.15 -0.06+0.1

1 . 6

1 0 ˚ M A X

.

A

± 0

. 1

2 . 5

0 . 2

5

1 0 ˚ M A X

. ± 0

. 1

± 0

. 1

A0.2 M

0.1 MAX.

2 . 7

4

3.15Pin 1marking

8

0.2

1.15

Reel ø180 mm = 3.000 Pieces/ReelReel ø330 mm = 10.000 Pieces/Reel

For symmetric types no defined Pin 1 orientation in reel.

Manufacturer

2005, JuneDate code (Year/Month)

BCW66HType code

Pin 1 markingLaser marking

Mark ing Layou t (Example )

Small variations in positioning ofDate code, Type code and Manufacture are possible.



2010-01-1512

BCR320U / BCR321U

Edition 2009-11-16

Published byInfineon Technologies AG81726 Munich, Germany

2009 Infineon Technologies AGAll Rights Reserved.

Legal Disclaimer

The information given in this document shall in no event be regarded as a guaranteeof conditions or characteristics. With respect to any examples or hints given herein,any typical values stated herein and/or any information regarding the application ofthe device, Infineon Technologies hereby disclaims any and all warranties andliabilities of any kind, including without limitation, warranties of non-infringement ofintellectual property rights of any third party.

Information

For further information on technology, delivery terms and conditions and prices,please contact the nearest Infineon Technologies Office ( <www.infineon.com> ).

Warnings Due to technical requirements, components may contain dangerous substances.For information on the types in question, please contact the nearest InfineonTechnologies Office.Infineon Technologies components may be used in life-support devices or systems

only with the express written approval of Infineon Technologies, if a failure of suchcomponents can reasonably be expected to cause the failure of that life-supportdevice or system or to affect the safety or effectiveness of that device or system.Life support devices or systems are intended to be implanted in the human body orto support and/or maintain and sustain and/or protect human life. If they fail, it isreasonable to assume that the health of the user or other persons may beendangered.

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Bcr320u_bcr321u Led Driver