DUAL NON-VOLATILE DAC (SMP9210): FIGURE 6

Nearly all DC-DC converters contain a Trim input pin for minor adjustment to the output voltage. The Trim pin is connected to an internal voltage reference of 1.2V through a series resistor allowing an external impedance, current or voltage source to adjust the output voltage by as much as ±10%. Using the I²C interface, the SMP9210 DACPOT's output voltage is programmed to finely position the converter output voltage to within specification at the load.

Voltage margining is also possible as is often required during production testing or field-testing to ensure system stability over the permitted operating voltage range. Local bypassing of the VDD, VREFH and VOUT pins reduces inaccuracies caused by the output ripple from the converters.

Ultra-high resolution of the output voltage setting is achieved using the circuits displayed in Figures 7a and 7b.

 

Figure 6: Dual DACPOT to DC-DC Converter Trim/Margin Interface

7a	7b

Figure 7a, and 7b: Increasing the Trim Resolution  

Application Note 25
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NOTICE

SUMMIT Microelectronics, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. SUMMIT Microelectronics, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user's specific application. While the information in this publication has been carefully checked, SUMMIT Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission.

SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support or aviation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness. Products are not authorized for use in such applications unless SUMMIT Microelectronics, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of SUMMIT Microelectronics, Inc. is adequately protected under the circumstances.