BCR402 datasheet(2/8 Pages) INFINEON

2 / 8 page

AN 066 Rev D

2 / 8

16-Jan-2004

Applications Note No. 066

Silicon Discretes

is also found in the BCR402R datasheet. Two

cases are shown: “open”, e.g. R1 is omitted (no

R1 used), showing nominal current to be 20mA,

and R1=68

Ω, yielding 30mA. For current up to

60mA, R1 will take on values less than 68

Ω, and

R1 can be determined experimentally. Note that

in all cases,

1. BCR402R output current should be

limited to 60mA

2. Total power dissipation of BCR402R

should be limited to less than 330 mW

for device soldering point temperatures

(TS) equal to or less than 87 °C.

The power dissipation is simply calculated by

multiplying the voltage drop across the device

(e.g. voltage between pins 2 and 3) times the

device current. A good general reference for

use when determining if a given circuit design

falls within device power dissipation guidelines

may be found at [1].

Figure 2.

Nominal Output Currents of

Devices in the Infineon LED Driver Family.

Current can be adjusted from these nominal

values via use of a single external resistor.

Figure 3.

BCR402R Output Current vs.

Supply Voltage for external resistor = OPEN

and external resistor = 68

Ω.

2. Application Circuit

The

application

circuit

designed

demonstrate the difference between stabilizing

LED current using an Infineon LED driver IC,

versus using a series resistance to stabilize

current.

This particular circuit has been

initially set up to operate over a supply

voltage range of 9V to 16V. The switch may

be used to easily toggle between BCR402R

mode and “resistor” mode.

Please refer to

Figure 4.

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