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With a PWM controller, like the MAX668, one gets the advantage of constant-frequency operation which is good for EMI control in noise sensitive audio and RF applications. But the advantage is achieved at the price of less flexibility in inductor value and vulnerability to a right-hand plane zero...
You can use the MAX1771 for variable output designs. One way to do it is to connect the feedback resistors to an external comparator and then apply a variable reference voltage to the comparator. But there are two tricks to doing this successfully with the MAX1771...
1. Comparator needs to be...
The MAX1771 is a controller and can do whatever current or voltage you want. But as the peak current limit set by the current sense resistor is set higher for the design, it becomes increasingly tricky to keep switching EMI off the FB pin and ground bounce from the AGND and PGND pins, and good...
MAX1771 boost circuits can be designed using the equations in the MAX863 data sheet. But, you'll need to substitute in the tOFFmin and tONmax specifications for the MAX1771, of course.
About 16 years ago, the Apps Engineer tried to put the full set of design equations in the datasheet but they...
MAX1771 boost circuits can be designed with the equations from the MAX863 data sheet. But, you'll need to use the tOFFmin and tONmax specs for the MAX1771.
Also, the MAX863 datasheet has a much better explanation of how the parts work. The operation is very similar except (1) MAX863 error...
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