Description:Integrated Overcurrent protection, Overvoltage protection, UVLO and brown-out protection; Brown out blanking time 50ms; Pin latch threshold 2.5V; 180° out of phase operation; Frequency Clamped Critical conduction Mode (FCCrM) operation; Frequency foldback at low power
A good PCB layout for optimal thermal performance involves placing the device on a thick copper plane, using thermal vias to dissipate heat, and keeping the surrounding area clear of other components. Refer to the onsemi application note AND9233/D for more details.
To ensure reliable start-up, make sure the input voltage is within the specified range, the input capacitor is properly sized, and the soft-start capacitor is correctly chosen. Also, ensure that the feedback network is properly compensated to prevent oscillations.
The maximum allowed output capacitance depends on the specific application and output voltage. As a general rule, keep the output capacitance below 100uF to ensure stable operation. However, it's recommended to consult the onsemi application note AND9233/D for more detailed guidance.
To troubleshoot oscillations or instability, check the feedback network for proper compensation, ensure the input and output capacitors are properly sized, and verify that the layout is not causing noise or coupling issues. Use an oscilloscope to measure the output voltage and current waveforms to identify the source of the issue.
The recommended input capacitor type is a low-ESR ceramic capacitor, such as X5R or X7R, with a value between 4.7uF to 10uF. The exact value depends on the input voltage and current requirements of your design.
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