ULN2003V12

IN3

IN4

OUT 1

OUT 2

OUT 3

OUT 4

IN5

IN6

IN7

GND

OUT 5

OUT 6

OUT 7

COM

IN1

IN2

VSUP LED Supply(Up to 20V)

R1

OUT 7

VSUP

VSUP

VIN (Up to 5.5V)

OUT7

R1 = (VIN-VOUT7)/IREF7

Use plot to estimate VOUT7 for the desired IREF7

ULN2003V12

SLRS060A – MAY 2012 – REVISED JUNE 2012

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Constant Current Generation

When configured as per Figure 5 the ULN2003V12 outputs OUT1-OUT6 act as independent constant current

sources. The current flowing through the resistor R1 is copied on all other channels. To increase the current

sourcing connect several output channels in parallel. To ensure best current copying set voltage drop across

connected load such that VOUTx matches to VOUT7.

Figure 5. ULN2003V12 as a Constant Current Driver

Figure 6. ULN2003V12 VOUT vs IREF

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