TPS54350PWPR datasheet(8/34 Pages) TI1

Part #	TPS54350PWPR

Description	4.5-V TO 20-V INPUT, 3-A OUTPUT SYNCHRONOUS PWM SWITCHER WITH INTEGRATER FET

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Manufacturer	TI1 [Texas Instruments]

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TPS54350

SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004

www.ti.com

8

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

Use 110 k

Ω when RT floats and 237 kΩ when RT is grounded and

using the sync out signal of another TPS54350. Set RT resistor

equal to 90% to 110% of external synchronization frequency.

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 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.

VI(SYNC)

VO(PH)

Figure 3. SYNC Input Waveform

Internal Oscillator

VO(PH)

VO(SYNC)

Figure 4. SYNC Output Waveform

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