 English |
|
|
|
|
|
|
|
| TLC5940_15 Datasheet, PDF (17/38 Pages) Texas Instruments – 16-Channel LED Driver | |||
| |||
| ◁ |
www.ti.com
TLC5940
SLVS515D â DECEMBER 2004 â REVISED NOVEMBER 2015
8.3.7 Setting Maximum Channel Current
The maximum output current per channel is programmed by a single resistor, R(IREF), which is placed between
IREF pin and GND pin. The voltage on IREF is set by an internal band gap V(IREF) with a typical value of
1.24 V. The maximum channel current is equivalent to the current flowing through R(IREF) multiplied by a factor of
31.5. The maximum output current per channel can be calculated by Equation 6.
Imax
=
V(IREF)
R(IREF)
à 31.5
where
⢠V(IREF) = 1.24 V
⢠R(IREF) = User-selected external resistor.
(6)
Imax must be set between 5 mA and 120 mA. The output current may be unstable if Imax is set lower than 5 mA.
Output currents lower than 5 mA can be achieved by setting Imax to 5 mA or higher and then using dot
correction.
Figure 1 shows the maximum output current IO versus R(IREF). R(IREF) is the value of the resistor between IREF
terminal to GND, and IO is the constant output current of OUT0 to OUT15. A variable power supply may be
connected to the IREF pin through a resistor to change the maximum output current per channel. The maximum
output current per channel is 31.5 times the current flowing out of the IREF pin.
Copyright © 2004â2015, Texas Instruments Incorporated
Product Folder Links: TLC5940
Submit Documentation Feedback
17
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese