TLD1310EL_15 Datasheet, PDF (15/24 Pages) Infineon Technologies AG – 3 Channel High Side Current Source

6
IN_SET Pin
The IN_SET pin is a multiple function pin for output current definition and input:
TLD1310EL
IN_SET Pin
IN_SET
I_{IN_SET}
V_{IN_SET}
GND
Figure 7 Block Diagram IN_SET pin
6.1
Output Current Adjustment via RSET
The output current for all three channels can only be adjusted simultaneously. The current adjustment can be done
by placing a low power resistor (R_SET) at the IN_SET pin to ground. The dimensioning of the resistor can be done
using the formula below:
R_SET
=
-----^k------
I_OUT
(2)
The gain factor k (R_SET * output current) is specified in Pos. 7.2.4 and Pos. 7.2.5. The current through the R_SET is
defined by the resistor itself and the reference voltage V_{IN_SET(ref)}, which is applied to the IN_SET during supplied
device.
6.2
Input Pin
The IN_SET pin can be connected via R_SET to the open-drain output of a µC or to an external NMOS transistor as
described in Figure 8. This signal can be used to turn off the output stages of the IC. A minimum IN_SET current
of I_{IN_SET(act)} is required to turn on the output stages. This feature is implemented to prevent glimming of LEDs
caused by leakage currents on the IN_SET pin, see Figure 10 for details.
Microcontroller
(e.g. XC866)
OUT
RSET
IN_SET
Current
adjust
BasLiIcTILXE^TMDBDasricver
V_DDP = 5 V
Figure 8 Schematics IN_SET interface to µC
The resulting switching times are shown in Figure 9:
GND
Data Sheet
15
Rev. 1.1, 2015-03-19