TPS54521 datasheet(28/41 Pages) TI1

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Time = 1 sec / div

Vin = 200 mV / div (AC coupled)

Inductor Current = 2 A / div

PH = 10 V / div

Vin = 12 V

Time = 20 msec / div

Vout = 5 V / div

Inductor Current = 10 A / div

PH = 10 V / div

Vin = 12 V

Load = 0.4

SS/TR = 1 V / div

Time = 1 sec / div

Vout = 50 mV / div (AC coupled)

Inductor Current = 2 A / div

PH = 10 V / div

Vin = 12 V

Time = 200 sec / div

Vin = 10 V / div

EN = 2 V / div

SS/TR = 1 V / div

Vout = 2 V / div

Time = 2 msec / div

EN = 2 V / div

Vout = 2 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

TPS54521

SLVS981C – JUNE 2010 – REVISED AUGUST 2013

www.ti.com

STARTUP and SHUTDOWN on EN

SHUTDOWN with VIN

with PRE-BIAS (1

Ω Load)

Ω Load)

Figure 41.

Figure 42.

SHUTDOWN with EN

OUTPUT VOLTAGE RIPPLE

Ω Load)

Ω Load)

Figure 43.

Figure 44.

INPUT VOLTAGE RIPPLE

Ω Load)

OVERCURRENT HICCUP MODE

Figure 45.

Figure 46.

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