Datasheet

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
IREF7
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 www.ti.com
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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