UCC28610

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Instructions for UCC28610

1. Power Supply Connection:

   • Connect the input voltage (VIN) to the VCC pin.
   • Ensure the input voltage is within the specified range (9V to 75V).

2. Start-Up and Operating Current:

   • The start-up current (ISTART) is approximately 120 μA.
   • The operating supply current (IOSC) is approximately 35 μA.

3. Switching Frequency:

   • Set the switching frequency (fSW) using an external resistor and capacitor on the RT/CT pins.
   • The typical switching frequency is 65 kHz, but it can be adjusted between 50 kHz and 100 kHz.

4. Duty Cycle and Timing:

   • The maximum duty cycle (DMAX) is 94%.
   • The minimum on-time (tON(min)) is 200 ns.
   • The minimum off-time (tOFF(min)) is 300 ns.

5. Under-Voltage Lockout (UVLO):

   • The device will shut down if the input voltage falls below the UVLO threshold (VUVLO(fall)).
   • It will restart when the input voltage rises above the UVLO threshold (VUVLO(rise)).

6. Over-Voltage Protection (OVP):

   • The device will shut down if the feedback voltage (VFB) exceeds the OVP threshold (VFB(OVP)).

7. Over-Current Protection (OCP):

   • The device will shut down if the current through the sense resistor exceeds the OCP threshold (IOCP).

8. Thermal Shutdown:

   • The device will shut down if the internal temperature exceeds the thermal shutdown threshold (TSD).
   • It will restart when the temperature drops below the thermal hysteresis (THYS).

9. Layout Considerations:

   • Keep high-frequency traces short and direct to minimize noise.
   • Use a ground plane to reduce EMI and improve thermal performance.

10. Testing and Troubleshooting:

    • Verify the input voltage and current are within specifications.
    • Check the switching frequency and duty cycle using an oscilloscope.
    • Monitor the temperature of the device to ensure it does not exceed the thermal shutdown threshold.

For detailed application circuits and further information, refer to the UCC28610 datasheet provided by Texas Instruments.