TPS54521 datasheet(28/35 Pages) TI

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Time = 2 msec / div

Vin = 5 V / div

Vout = 1 V / div

Vout starting from 1 V pre-bias voltage

Time = 2 msec / div

Vin = 10 V / div

EN = 2 V / div

Vout = 2 V / div

SS/TR = 1 V / div

Time = 1 msec / div

EN = 1 V / div

Vout = 1 V / div

Vout starting and stopping from 1 V pre-bias voltage

Time = 2 msec / div

Vin = 10 V / div

EN = 2 V / div

Vout = 2 V / div

SS/TR = 1 V / div

Time = 200

sec / div

Vin = 10 V / div

EN = 2 V / div

SS/TR = 1 V / div

Vout = 2 V / div

Time = 1

sec / div

Vout = 50 mV / div (AC coupled)

Inductor Current = 2 A / div

PH = 10 V / div

Vin = 12 V

TPS54521

SLVS981 – JUNE 2010

www.ti.com

STARTUP with EN

STARTUP on VIN with PRE-BIAS

(No Load)

(0.66

Ω Load)

Figure 39.

Figure 40.

STARTUP and SHUTDOWN on EN

SHUTDOWN with VIN

with PRE-BIAS (0.66

Ω Load)

(0.66

Ω Load)

Figure 41.

Figure 42.

SHUTDOWN with EN

OUTPUT VOLTAGE RIPPLE

(0.66

Ω Load)

(0.66

Ω Load)

Figure 43.

Figure 44.

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