switching power supply 4


Posted on Feb 7, 2014    12260

The MAX1846 inverting circuit to implement a switch-mode power supply that provides a -15V at 0. 5A output from a 4. 5V to 12V input. This MAX1846 circuit also adds a few components to the minimum circuit implementation. C20 adds a pole to compensate for the ESR-zero of the output capacitor, while R16 and C22 filter the current-sense voltage to prev


switching power supply 4
Click here to download the full size of the above Circuit.

ent high-frequency switching noise from tripping the current limit. This functionality is in addition to the MAX1846 ²s internal 100ns current-sense blanking time. The MAX1846 EXT pin implements controlled slew rate, which helps limit high-frequency switching noise. The MAX668 boost circuit to implement a switch-mode power supply that provides a +15V at 0. 5A output from a 4. 5V to 12V input. This MAX668 circuit adds a few components to the minimum circuit implementation. C7 adds a pole to compensate for the ESR-zero of the output capacitor. R5 and C8 filter the current-sense voltage to prevent high-frequency switching noise from prematurely tripping the current limit. This functionality is in addition to the MAX668 ²s internal 60ns current-sense blanking time. The MAX668 output voltage can be changed to +12V by changing the value of the R2 resistor to 86. 6k This change reduces the minimum input voltage to approximately 10V. Since the MAX668 provides internal compensation, no other changes are required for +12V output. The output ripple voltage due to switching can be reduced an order of magnitude with a secondary output filter set to one-tenth of the switching frequency. A 1, 0. 5W resistor in series with a 10uF, 25V capacitor with less than 100m ESR introduces a 0. 5V decrease in output voltage at a 0. 5A load. The feedback voltage must be sensed before it reaches the secondary filter for the MAX668 to maintain...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     



    Top