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TLC5923 Datasheet(PDF) 7 Page - Texas Instruments |
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TLC5923 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 15 page ![]() www.ti.com PRINCIPLES OF OPERATION Setting Maximum Channel Current I MAX + V IREF R IREF 40 (1) 100 1 k 10 k 100 k 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0 48.8 k 9.76 k 4.88 k 2.44 k 1.63 k 1.22 k 976 813 697 IOLC − Output Current − mA VOutn = 1 V DC = 127 Setting Dot-Correction I Outn + I MAX DCn 127 (2) TLC5923 SLVS550 – DECEMBER 2004 The maximum output current per channel is set by a single external resistor, R(IREF), which is placed between IREF and GND. The voltage on IREF is set by an internal band gap V(IREF) with a typical value of 1.24V. The maximum channel current is equivalent to the current flowing through R(IREF) multiplied by a factor of 40. The maximum output current can be calculated by Equation 1: where: VIREF = 1.24V typ. RIREF = User selected external resistor (RIREF should not be smaller than 600 Ω) Figure 8 shows the maximum output current, IO(LC), versus R(IREF) . In Figure 8, R(IREF) is the value of the resistor between IREF terminal to ground, and IO(LC) is the constant output current of OUT0,.....OUT15. Figure 8. Reference Resistor vs Output Current The TLC5923 has the capability to fine adjust the current of each channel, OUT0 to OUT15 independently. This is also called dot correction. This feature is used to adjust the brightness deviations of LED connected to the output channels OUT0 to OUT15. Each of the 16 channels can be programmed with a 7-bit word. The channel output can be adjusted in 128 steps from 0% to 100% of the maximum output current IMAX. Equation 2 determines the output current for each OUTn: where: IMax = the maximum programmable current of each output DCn = the programmed dot-correction value for output n (DCn = 0, 1, 2 ...127) n = 0, 1, 2 ... 15 7 |
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