TPS54353-EP datasheet(11/35 Pages) TI1

No de pièce	TPS54353-EP

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

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Fabricant	TI1 [Texas Instruments]

Site Internet	http://www.ti.com

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VI(SYNC)

VO(PH)

Internal Oscillator

VO(PH)

VO(SYNC)

Power Good (PWRGD)

TPS54352-EP

,, TPS54353-EP,, TPS54354-EP

TPS54355-EP

, TPS54356-EP, TPS54357-EP

www.ti.com ....................................................................................................................................................... SLVS684A – JANUARY 2007 – REVISED JULY 2009

Figure 3. SYNC Input Waveform

Figure 4. SYNC Output Waveform

The VSENSE pin is compared to an internal reference signal if the VSENSE is greater than 97% and no other

faults are present. The PWRGD pin presents a high impedance. A low on PWRGD indicates a fault. PWRGD

has been designed to provide a weak pulldown and indicates a fault even when the device is unpowered. If the

TPS5435x has power and has any fault flag set, the TPS5435x indicates the power is not good by driving the

PWRGD pin low. The following events, singly or in combination, indicate power is not good:

• VSENSE pin out of bounds

• Overcurrent

• Thermal shutdown

• UVLO undervoltage

• Input voltage not present (weak pulldown)

• Slow starting

• VBIAS voltage is low.

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Product Folder Link(s): TPS54352-EP TPS54353-EP TPS54354-EP TPS54355-EP TPS54356-EP TPS54357-EP

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