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TPS54352 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS54352 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 37 page TPS54352,TPS54353 TPS54354,TPS54355 TPS54356,TPS54357 SLVS519A − MAY 2004 − REVISED OCTOBER 2004 www.ti.com 10 Table 3. SWITCHING FREQUENCY SYNC PIN RT PIN 250 kHz, internally set Generates SYNC output signal AGND 500 kHz, internally set Generates SYNC output signal Float Externally set to 250 kHz to 700 kHz Terminate to quiet ground with 10-k Ω resistor. R = 215 k Ω to 69 kΩ Externally synchronized frequency Synchronization Signal Set RT resistor equal to 90% to 110% of external synchronization frequency.When using a dual setup (see Figure 27 for example), if the master 35x device RT pin is left floating, use a 110 k Ω resistor to tie the slave RT pin to ground. Conversely, if the master 35x device RT pin is grounded, use a 237 k Ω resistor to tie the slave RT pin to ground. 180 5 Out of Phase Synchronization (SYNC) 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 Figures 3, 4, and 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 TPS5435x 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 TPS5435x 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 TPS5435x 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. VI(SYNC) VO(PH) Figure 3. SYNC Input Waveform |
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