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TPS54350MPWPREP Datasheet(PDF) 10 Page - Texas Instruments |
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TPS54350MPWPREP Datasheet(HTML) 10 Page - Texas Instruments |
10 / 36 page www.ti.com 180 ° Out of Phase Synchronization (SYNC) VI(SYNC) VO(PH) Internal Oscillator VO(PH) VO(SYNC) TPS54350-EP SGLS308 – OCTOBER 2005 The SYNC pin is configurable as an input or as an output, per the description in the previous section. When operating as an input, the SYNC pin is a falling-edge triggered signal (see Figure 3, Figure 4, and Figure 19). When operating as an output, the signal's falling edge is approximately 180 ° out of phase with the rising edge of the PH pins. Thus, two TPS54350 devices operating in a system can share an input capacitor and draw ripple current at twice the frequency of a single unit. When operating the two TPS54350 devices 180 ° out of phase, the total RMS input current is reduced. Thus reducing the amount of input capacitance needed and increasing efficiency. When synchronizing a TPS54350 to an external signal, the timing resistor on the RT pin must be set so that the oscillator is programmed to run at 90% to 110% of the synchronization frequency. NOTE: Do not use synchronization input for designs with output voltages >10 V. Figure 3. SYNC Input Waveform Figure 4. SYNC Output Waveform 10 |
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