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PTH04T220WAZ Datasheet(PDF) 25 Page - Texas Instruments |
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PTH04T220WAZ Datasheet(HTML) 25 Page - Texas Instruments |
25 / 39 page www.ti.com Smart Sync PTH04T220W Vi Track GND VoAdj Vo TT +Sense −Sense Inhibit/ UVLO GND D PRE Vi GND VoAdj Vo TT +Sense −Sense + Inhibit/ UVLO Sync + + Q CLK SN74LVC2G74 + SYNC RSET1 330 µF fCLK = 2 x fMODULE VO1 0 ° 180 ° VCC CLR Q VO2 CO1 CO2 UDG−06051 CI1 CI2 RSET2 330 µF 220 µF 220 µF Track VI = 5 V PTH04T220W PTH04T220W, PTH04T221W SLTS275A – DECEMBER 2006 – REVISED FEBRUARY 2007 Smart Sync is a feature that allows multiple power modules to be synchronized to a common frequency. Driving the Smart Sync pins with an external oscillator set to the desired frequency, synchronizes all connected modules to the selected frequency. The synchronization frequency can be higher or lower than the nominal switching frequency of the modules within the range of 240 kHz to 400 kHz (see Electrical Specifications table for synchronization limits). Synchronizing modules powered from the same bus, eliminates beat frequencies reflected back to the input supply, and also reduces EMI filtering requirements. Eliminating the low beat frequencies (usually < 10 kHz) allows the EMI filter to be designed to attenuate only the synchronization frequency. Power modules can also be synchronized out of phase to minimize source current loading and minimize input capacitance requirements. Figure 25 shows a standard circuit with two modules syncronized 180 ° out of phase using a D flip-flop. Figure 25. Smart Sync Schematic 25 Submit Documentation Feedback |
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