Datasheet BCR 401 R Datasheet

BCR401R

LED Driver Features

• LED drive current of 10mA

• Output current adjustable up to 60mA with

external resistor

• Supply voltage up to 18V

• Easy paralleling of drivers to increase current

• Low voltage overhead of 1.2V

• High current accuracy at supply voltage variation

• No EMI

• Reduced output current at higher temperatures - negative thermal coefficient of -0.3% / K

• RoHS compliant (pb-free) SOT143R package

• Qualified according AEC Q101

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4

2

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Applications

• Channel letters for advertising, LED strips for decorative lighting

• Aircraft, train, ship illumina tion

• Retrofits for general lighting, white goods like refrigerator lighting

• Medical lighting

General Description

The BCR401R is a cost efficient LED driver to drive low power LED’s. The advantages towards resistor biasing are:

• homogenous light output despite varying forward voltages in different LED strings

• homogenous light output of LED’s despite voltage drop across long supply lines

• homogenous light output independent from supply voltage variations

• longer lifetime of the LED’s due to reduced output current at higher temperatures

(negative thermal coefficient) The advantages towards discrete solutions are:

• lower assembly cost

• smaller form f actor

• better quality due to less soldering points

• higher output current accuracy due to pretested LED drivers

Dimming is possible by using an external digital transistor at the ground pin. The BCR401R can be operated at higher supply voltages by putting LED’s between the power supply +VS and the power supply pin of the LED driver. You can find further details in the application note AN066. The BCR401R is a perfect fit for numerous low power LED applications by combining small form factor with low cost. These LED drivers offer several advantages to resistors like significantly higher current control at very low voltage drop ensuring high lifetime of LED’s.

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BCR401R

Typical ApplicationPin Configuration

+ V s

R e x t

V d r o p

4 3

B C R 4 0 1 R

3

4

21

EHA07188

1

I s I o u t

2

Type Marking Pin Configuration Package

BCR401R W5s

1 = GND 2 =

I

out

3 =

V

4 =

S

R

ext

SOT143R

Maximum Ratings Parameter Symbol Value Unit

Supply voltage Output current Output voltage

Reverse voltage between all terminals Total power dissipation,

T

= 75 °C

S

Junction temperature Storage temperature

V I

out

V V P T T

S

out R

tot j stg

18 V 60 mA

16 V

0.5 330 mW 150 °C

-65 ... 150

Thermal Resistance Parameter

Junction - soldering point

1

For calculation of

R

please refer to Application Note Thermal Resistance

thJA

1)

Symbol Value Unit

R

thJS

225 K/W

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BCR401R

Electrical Characteristics at

T

=25°C, unless otherwise specified

A

Parameter

Characteristics

Collector-emitter breakdown voltage

I

= 100 µA,

C

I

B

= 0

Supply current

V

= 10 V

S

DC current gain

I

= 50 mA,

C

V

CE

= 1 V

Internal resistor

I

= 10 mA

Rint

Output current

V

= 10 V,

S

Voltage drop (

= 20 mA

I

out

V

out

= 7.6 V

V

-

V

S

)

E

Symbol Values Unit

min. typ. max.

V

BR(CEO)

I

S

h

FE

R

int

I

out

V

drop

18 - - -

350 440 540 µA

- 150 - -

66 79 94 Ω

9 10 11 mA

- 0.79 - V

DC Characteristics with stabilized LED load

Lowest sufficient supply voltage overhead

I

> 8mA

out

Output current change versus

V

= 10 V

S

Output current change versus

V

= 10 V

S

T

V

A

S

V

Smin

∆

I

out/Iout

∆

I

out/Iout

- 1.2 - V

- -0.3 - %/K

- 2 - %/V

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BCR401R

Total power dissipation

360

mA

300 270 240

tot

P

210 180 150 120

90 60 30

0

0 15 30 45 60 75 90 105 120

P

tot

= f (

T

)

S

Permissible Pulse Load

R

thJS

= f (

t

)

p

3

10

K/W

2

10

thJS

R

°C

T

1

10

0

10

-7

-6

-5

150

S

10

-4

10

0.5

0.2

0.1

0.05

0.02

0.01

0.005 D = 0

-3

10

-2

s

t

0

10

p

Permissible Pulse Load

P

totmax

/

P

totDC

= f (

t

)

p

2

10

totDC

P

/

totmax

P

10

-

1

0

-7

10

-6

10

D = 0

0.005

0.01

0.02

0.05

0.1

0.2

0.5

-5

-4

10

-3

10

-2

s

t

0

10

p

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BCR401R

Output current versus supply voltage

I

= f (

V

);

R

out

S

Load: two LEDs with

-1

10

A

out

I

-2

10

-3

10

0 2 4 6 8 10 12 14 16

= Parameter

ext

V

Rext = 36 Ohm Rext = 82 Ohm Rext = 160 Ohm Rext = open

= 3.8V in series

F

V

S

20

Supply current versus supply voltage

I

= f(

V

S

Load: two LEDs with

S

I

)

S

V

= 3.8V in series

F

-3

10

A

-4

10

-5

10

0 2 4 6 8 10 12 14 16

V

S

20

Output current versus reference voltage

I

= f (

out

V

-1

10

A

-2

10

out

I

-3

10

-4

10

-5

10

0.6 0.65 0.7 0.75 0.8 0.85 0.9

DROP

);

V

= 10V;

S

V

out

= 7.6V

V

1

drop

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BCR401R

Standard Application Circuit:

B C R 4 0 1 R

1

I s I o u t

2

3

4

+ V s

R e x t

V d r o p

Application Circuit:

supply voltages >18V

Vsupply

I

OUT

BCR401R BCR402R

I

DRIVER

Vs

GND

Rext

Iout

+ I

DRIVER

I

OUT

LEDs

Rsense

(optional)

LEDs

Application hints

BCR401R serves as an easy to use constant current source for LEDs. In stand alone application an external resistor can be connected to adjust the current from 10 mA to 60 mA. Rext can be determined by using the diagram 'Output current versus external resistor', or by refering to diagram 'Output current versus reference voltage'. Look for your desired output current on the y axis and read out the corresponding Vdrop. Calculate Rext: Rext = Vdrop / (Iout -(Vdrop/Rint)) Please take into account that the resulting output currents will be slightly lower due to the self heating of the component and the negative thermal coefficient.

Please visit our web site for application notes: www.infineon.com/lowcostleddriver

• AN066 explains the basic concept

• AN077 gives hints to thermal design

• AN159 provides information how to add a power transistor to increase the output current

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Package Outline

Package SOT143R

BCR401R

Foot Print

+0.1

0.4

-0.05

0.25MB

±0.1

2.9

1.9

43

12

1.7

0.8 0.81.2

0.8 0.8 1.2

0.2

0.8

+0.1

-0.05

B

±0.15

2.4

0.90.9

1.1

0.15 MIN.

MAX. 10˚

0˚... 8˚

M

A

0.2

±0.1

1

0.1 MAX.

0.08...0.15

±0.1

1.3

MAX. 10˚

A

Marking Layout (Example)

Standard Packing

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

Pin 1

Reverse bar

2005, June

Date code (YM)

Manufacturer

BFP181R

Type code

4

8

2.6

3.15

0.2

1.15

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BCR401R

Attention please!

The information given in this data sheet shall in no event be regarded as a guarantee of conditions or characteristics (“Beschaffenheitsgarantie”). With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party.

Information

For further information on technology, delivery terms and conditions and prices please contact your 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 your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device 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, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

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