BL8585 datasheet(3/6 Pages) BELLING

Part #	BL8585

Description	WIDE RANGE, LINEAR LED DRIVER

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Manufacturer	BELLING [SHANGHAI BELLING CO., LTD.]

Direct Link	http://www.belling.com.cn

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BL8585

OPERATION

The BL8585 is a high voltage integrated

constant current driver. It can operate in a

wide range from 5V to 90V, and the output

current can be programmed just by change the

sense resistor. This module provides a precise

regulated

output

current,

the

typical

application is showed in figure 1.

As the BL8585 is a linear power supply, with

high input voltage, the power dissipation

should be considered. For example, if the set

current is 20mA, when the VA-B is 5V, the

module dissipation

W

P

I

V

P

D

SET

B

A

D

1

.

0











If the VA-B is 90V, the power dissipation is as

high as 1.8W. An external resistor R1 can be

added to reduce the power dissipation of the

BL8585. Then the power dissipation on the

IC becomes

)

(

1

R

V

I

V

P

Sense

B

A

SET

B

A

D









When the ambient temperature is fixed, from

thermal resistance value, the maximum power

dissipation of the IC can be calculated. Say

the maximum allowed temperature increase is

50C, with TO-92 package (170C/W thermal

resistance), the maximum allowed power

dissipation is 0.29W. Assume the maximum

VA-B is 50V, Iset = 20mA, and Vsense = 0.6V.

Then











k

V

P

I

V

R

B

A

D

SET

sense

B

A

5

.

3

)

/(

)

(

1

R1’s power requirement can be calculated by

W

R

V

P

B

A

R

71

.

0

1

2

1







Rsense can be calculated from sense voltage

and current set:





30

SET

IS

sense

I

V

R

LC1920

Is

VA

VB

UP to 90V+VLED

Figure1: Typical application circuit

R1

Rsense

ISET

BL8585

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BL8585 Datasheet(PDF) 3 Page - SHANGHAI BELLING CO., LTD.

BL8585 Datasheet(HTML) 3 Page - SHANGHAI BELLING CO., LTD.

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