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LTC3883 Datasheet(PDF) 49 Page - Linear Technology |
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LTC3883 Datasheet(HTML) 49 Page - Linear Technology |
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49 / 136 page  LTM4676A 49 4676afa For more information www.linear.com/LTM4676A applicaTions inForMaTion Table 4. FSWPHCFG Pin Strapping Look-Up Table to Set the LTM4676A's Switching Frequency and Channel Phase-Interleaving Angle (Not Applicable if MFR_CONFIG_ALL[6] = 1b) RFSWPHCFG* (kΩ) SWITCHING FREQUENCY (kHz) θSYNC TO θ0 θSYNC TO θ1 bits [2:0] of MFR_PWM_CONFIG bit [4] of MFR_CONFIG_ALL Open NVM; LTM4676A Default = 500 NVM; LTM4676A Default = 0° NVM; LTM4676A Default = 180° NVM; LTM4676A Default = 000b NVM; LTM4676A Default = 0b 32.4 250 0° 180° 000b 0b 22.6 350 0° 180° 000b 0b 18.0 425 0° 180° 000b 0b 15.4 575 0° 180° 000b 0b 12.7 650 0° 180° 000b 0b 10.7 750 0° 180° 000b 0b 9.09 1000 0° 180° 000b 0b 7.68 500 120° 240° 100b 0b 6.34 500 90° 270° 001b 0b 5.23 Sync Slave** 0° 240° 010b 1b 4.22 Sync Slave** 0° 120° 011b 1b 3.24 Sync Slave** 60° 240° 101b 1b 2.43 Sync Slave** 120° 300° 110b 1b 1.65 Sync Slave** 90° 270° 001b 1b 0.787 Sync Slave** 0° 180° 000b 1b 0 Sync Slave** 120° 240° 100b 1b *RFSWPHCFG value indicated is nominal. Select RFSWPHCFG from a resistor vendor such that its value is always within 3% of the value indicated in the table. Take into account resistor initial tolerance, T.C.R. and resistor operating temperatures, soldering heat/IR reflow, and endurance of the resistor over its lifetime. Thermal shock/cycling, moisture (humidity) and other effects (depending on one’s specific application) could also affect RFSWPHCFG’s value over time. All such effects must be taken into account in order for resistor pin-strapping to yield the expected result at every SVIN power-up and/or every execution of MFR_RESET or RESTORE_USER_ALL, over the lifetime of one’s product. **The “Sync Slave” setting results in MFR_CONFIG_ALL[4] being set to 1b and FREQUENCY_SWITCH being set according to user-configurable EEPROM contents corresponding to Command 0x33 (factory default: 500kHz). In this configuration, the module’s switching frequency synchronizes to the SYNC signal, provided that the SYNC pin is driven in a manner consistent with specifications (see Switching Frequency and Phase subsection of the Applications Information section for details). |
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