SLVU251B June   2008  – February 2022 TPS51220

 

  1.   Trademarks
  2. 1Description
  3. 2Electrical Performance
  4. 3Schematic
  5. 4Test Setup and Procedure
    1. 4.1 Test Setup
    2. 4.2 Test Procedure
  6. 5Configuration
    1. 5.1 Switching Frequency Selection
    2. 5.2 Skip Mode and Control Scheme Selection
    3. 5.3 Current-Sensing Selection
    4. 5.4 Overcurrent Limit and Discharge Selection
    5. 5.5 Control Mode and Protection Selection
    6. 5.6 Soft-Start Setting Selection
    7. 5.7 Output Voltage Adjustment
  7. 6Bill of Materials
  8. 7EVM Assembly Drawing and PCB Layout
  9. 8Reference
  10. 9Revision History

5.1 Switching Frequency Selection

The switching frequency can be set by the RF-resistor (R15) or applying external clock into RF pin on the EVM.

Default setting is 280-kHz using RF resistor.

Table 5-1 Switching Frequency Selection
Connection
InternalAdd RF-resistor from RF to GND and be R31 open
GUID-5817EFFE-D833-44D5-A5DF-04D97AA2A55F-low.gif
ExternalApply external clock signal to SYNC (5 Vpp and 50% duty) , remove R15 in addition, and add 0-Ω to R31.