TPS54353PWPRG4 datasheet(10/37 Pages) TI

Part #	TPS54353PWPRG4

Description	4.5-V TO 20-V INPUT, 3-A OUTPUT SYNCHRONOUS PWM

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Manufacturer	TI [Texas Instruments]

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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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