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DS4412 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS4412 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 10 page Dual-Channel, I2C Adjustable Sink/Source Current DAC _______________________________________________________________________________________ 9 Applications Information Example Calculation for an Adjustable Power Supply In this example, the Typical Operating Circuit is used as a base to create Figure 3, a 2.0V voltage supply with ±20% margin. The adjustable power supply has a DC-DC converter output voltage, VOUT, of 2.0V and a DC-DC converter feedback voltage, VFB, of 0.8V. To determine the relationship of R0A and R0B, we start with the equation: Substituting VFB = 0.8V and VOUT = 2.0V, the relation- ship between R0A and R0B is determined to be: R0A = 1.5 x R0B IOUT0 is chosen to be 1mA (midrange source/sink cur- rent for the DS4412). Summing the currents into the feedback node, we have the following Where: And To create a 20% margin in the supply voltage, the value of VOUT is set to 2.4V. With these values in place, R0B is calculated to be 267 Ω, and R0A is calculated to be 400Ω. The current DAC in this configuration allows the output voltage to be moved linearly from 1.6V to 2.4V using 15 settings. This corresponds to a resolution of 25.8mV/step. VCC Decoupling To achieve the best results when using the DS4412, decouple the power supply with a 0.01µF or 0.1µF capacitor. Use a high-quality ceramic surface-mount capacitor if possible. Surface-mount components mini- mize lead inductance, which improves performance, and ceramic capacitors tend to have adequate high- frequency response for decoupling applications. I VV R RA OUT FB A 0 0 = − I V R RB FB B 0 0 = II I OUT R B R A 00 0 = − V R RR V FB B AB OUT = + × 0 00 DC-DC CONVERTER FB OUT SDA SCL OUT0 GND RFS0 = 4.612k Ω 4.7k Ω 4.7k Ω VCC VCC VOUT = 2.0V FS0 R0B = 267 Ω R0A = 400 Ω VFB = 0.8V IR0A IR0B IOUT0 DS4412 Figure 3. Example Application Circuit PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 8 µSOP U8+1 21-0036 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. |
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