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DAC53401 Arkusz danych(PDF) 33 Page - Texas Instruments |
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DAC53401 Arkusz danych(HTML) 33 Page - Texas Instruments |
33 / 42 page VOUT RSET VCC Q1 LED ISET ILED = ISET VDAC VFB VDD DACx340 1 + - VGS 33 DAC53401, DAC43401 www.ti.com SLASES7 – JULY 2019 Product Folder Links: DAC53401 DAC43401 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The DACx3401 is a buffered-output, single-channel, low-power DAC available in a tiny 3 × 3 package. The features, low power, and small package makes this DAC suitable for general-purpose applications in a wide range of end equipment. Some of the most common applications for this devices are set-and-forget LED biasing in automotive applications and mobile projectors, power-supply control, general-purpose function generation, medical alarm generation, programmable comparator applications (such as smoke detectors, standalone PWM control loops, and offset and gain trimming in precision circuits). 9.2 Typical Applications This section explains the design details of three primary applications of DACx3401: programmable LED biasing, power-supply control. and medical alarm generation. 9.2.1 Programmable LED Biasing LED and laser biasing or driving circuits often require accuracy and stability of the luminosity with respect to variation in temperature, electrical conditions, and physical characteristics. This accuracy and stability are most effectively achieved using a precision DAC, such as the DACx3401. The DACx3401 has additional features, such as the VFB pin that compensates for the gate-to-source voltage of the transistor (VGS) drop and the drift of the MOSFET. The NVM allows the microprocessor to set-and-forget the LED biasing value, even during a power cycle. Figure 18 shows the circuit diagram for LED biasing. Figure 18. LED Biasing 9.2.1.1 Design Requirements • DAC output range: 0 V to 2.4 V • LED current range: 0 mA to 20 mA |
Podobny numer części - DAC53401 |
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Podobny opis - DAC53401 |
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