LM21212-1_15 datasheet(8/33 Pages) TI

No de pièce	LM21212-1

Description	12A High Efficiency Synchronous Point of Load Buck Regulator with Frequency Synchronization

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Fabricant	TI [Texas Instruments]

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VOUT (500 mV/Div)

VPGOOD (5V/Div)

VENABLE (5V/Div)

VOUT (500 mV/Div)

VPGOOD (5V/Div)

VENABLE (5V/Div)

IOUT (10A/Div)

VOUT (50 mV/Div)

IOUT (5A/Div)

VOUT (10 mV/Div)

VOUT (200mV/Div)

VSYNC (2V/Div)

VSWITCH (2V/Div)

VOUT (200 mV/Div)

VSYNC (2V/Div)

VSWITCH (2V/Div)

LM21212-1

SNVS671E – FEBRUARY 2011 – REVISED MARCH 2013

www.ti.com

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified: VVIN = 5V, VOUT = 1.2V, L= 0.56µH (1.8mΩ RDCR), CSS = 33nF, fSW = 1 MHz, TA = 25°C for

efficiency curves, loop gain plots and waveforms, and TJ = 25°C for all others.

SYNC Signal Lost

SYNC Signal Acquired

4 µs/DIV

Figure 17.

Figure 18.

Load Transient Response

Output Voltage Ripple

100 µs/DIV

1 µs/DIV

Figure 19.

Figure 20.

Startup with Prebiased Output

Startup with SS/TRK Open Circuit

200 µs/DIV

2 ms/DIV

Figure 21.

Figure 22.

8

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