Description:The Intersil ISL90727 and ISL90728 are digitally controlled potentiometers (XDCP™). Each device consists of a resistor array, wiper switches, and a control section. The wiper position is controlled by an I2C Bus™. The potentiometer is implemented by a resistor array composed of 127 resistive elements and a wiper switching network. Between each element and at either end are tap points accessible to the wiper terminal. The position of the wiper element is controlled by the SDA and SCL inputs.
Renesas provides a recommended PCB layout guide in their application note AN1995, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
To optimize output voltage accuracy and stability, ensure that the input voltage is within the recommended range, use a high-quality output capacitor with low ESR, and minimize noise and ripple on the input and output lines. Additionally, consider using a voltage reference IC or a precision resistor divider network to improve output voltage accuracy.
The maximum allowed input voltage ripple and noise are not explicitly stated in the datasheet, but as a general guideline, it's recommended to keep the input voltage ripple and noise below 1% of the input voltage to ensure stable operation and prevent oscillations.
While it's possible to use a different inductor value or type, it's not recommended as it may affect the converter's stability, efficiency, and output voltage accuracy. Renesas recommends using the specified inductor value and type to ensure optimal performance and to avoid potential issues.
To troubleshoot issues with the converter, start by checking the input voltage, output voltage, and current waveforms using an oscilloscope. Verify that the input voltage is within the recommended range, and that the output voltage and current are within the specified limits. Check for noise and ripple on the input and output lines, and ensure that the PCB layout and component selection meet the recommended guidelines.
Trust Checks
This model has been built in collaboration with the manufacturer.
Manufacturer Collaborated
This model has been verified by system checks.
System Verified
This model has been reviewed by community users.
Community Approved
Sponsored
ISL90728WIE627Z-T7A Overview
Use the download button to access the ISL90728WIE627Z-T7A schematic symbol, PCB footprint, and 3D model.
To find more CAD model downloads similar to this part, try a partial part number search, like ISL90,
or try a keyword search, such as Digital Potentiometers
