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DAC53401 датащи(PDF) 35 Page - Texas Instruments |
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DAC53401 датащи(HTML) 35 Page - Texas Instruments |
35 / 43 page P DAC FB 3 V V R 10 A 35 DAC53401, DAC43401 www.ti.com SLASES7 – JULY 2019 Product Folder Links: DAC53401 DAC43401 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Typical Applications (continued) 9.2.2.2 Detailed Design Procedure The DACx3401 features a Hi-Z power-down mode that is set by default at power-up, unless the device is programmed otherwise using the NVM. When the DAC output is at Hi-Z, the current through R3 is zero and the SMPS is set at the nominal output voltage of 3.3 V. To have the same nominal condition when the DAC powers up, make sure to power up the device at the same output as VFB (that is 0.6 V). This configuration makes sure there is no current through R3 even at power-up. To achieve ±10% margin-high and margin-low conditions, the DAC must draw ±10% of the nominal current (that is, ±10 µA). In order to calculate the value of R3, first decide the DAC output range, making sure to avoid the codes near zero scale and full-scale for safe operation in the linear region. A DAC output of 20 mV can be safely considered as the minimum output and (1.8 V – 0.6 V – 20 mV = 1.18 V) can be considered as the maximum output. When the DAC output is at 20 mV, the power supply goes to margin high, and when the DAC output is at 1.18 V, the power supply goes to margin low. The value of R3 can be calculated by Equation 7. For the previous values, R3 = 58 kΩ. (7) The DACx3401 have a slew rate feature that is used to toggle between margin high, margin low, and nominal outputs with a defined slew rate. See the GENERAL_CONFIG register description for the slew rate setting details. The pseudocode for getting started with a power-supply control application is as follows: //SYNTAX: WRITE <REGISTER NAME (Hex code)>, <MSB DATA>, <LSB DATA> //Power-up the device, enable internal reference with 1x output span //CODE_STEP: 1-bit, SLEW_RATE: 12µs WRITE GENERAL_CONFIG(0xD1), 0x11, 0x84 //Write DAC code (12-bit aligned) for nominal output //For a 1.8V output range, the 10-bit Hex code for 20mV is 0x0B. With 12-bit alignment, it becomes 0x2C WRITE DAC_DATA(0x21), 0x0F, 0xFC //Write DAC code (12-bit aligned) for margin-high output WRITE DAC_MARGIN_HIGH(0x25), 0x0A, 0x7C //Write DAC code (12-bit aligned) for margin-low output WRITE DAC_MARGIN_LOW(0x26), 0x00, 0x2C //Trigger margin-high output WRITE TRIGGER(0xD3), 0x00, 0x80 //Trigger margin-low output WRITE TRIGGER(0xD3), 0x00, 0x40 //Write back DAC code (12-bit aligned) for nominal output WRITE DAC_DATA(0x21), 0x0F, 0xFC |
Аналогичный номер детали - DAC53401_V01 |
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Аналогичное описание - DAC53401_V01 |
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