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Here's another newly-uploaded Circuit Design Idea designed to give circuit building inspiration (click on the circuit diagram to expand it).It covers adding a current-output DAC to a dc/dc converter's circuit allow you to add margining capability.
The Design Idea begins:
You can easily add margining capability - that is, the ability to digitally adjust the output voltage - to a dc/dc converter by making a single connection to the circuit. The dashed line in Figure 1 shows the connection. The extra IC is a two- or four-channel, I2C (inter-integrated-circuit)-adjustable-current DS4402 or DS4404 DAC. Because each DAC output is 0 mA at power-up, the extra circuitry is essentially transparent to the system until you write a command using the I2C bus.
For example, assume that the input voltage is 3 to 5.5V; the output voltage is 1.8V, which is the desired nominal output voltage; and the feedback voltage is 0.6V. You can obtain the feedback voltage from the dc/dc converter's data sheet; be sure to verify that it is within the output-voltage range that the current DAC's data sheet specifies as sinking or sourcing voltage depending on whether you are sinking or sourcing current.Read the full Circuit Design Idea
It is courtesy of Jiaqi Shen and Xiaoshu Cai, University of Shanghai for Science and Technology, Shanghai, China.
View all the Design Ideas on Electronics Weekly
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