Datasheet

V
OUT
(500 mV/Div)
V
PGOOD
(5V/Div)
V
ENABLE
(5V/Div)
I
OUT
(10A/Div)
0 2 4 6 8 10 12
80
82
84
86
88
90
92
94
96
EFFICIENCY (%)
OUTPUT CURRENT (A)
500kHz
1MHz
1.5MHz
Performance Characteristics www.ti.com
4 Performance Characteristics
Efficiency Plots
Figure 2 shows the conversion efficiency versus output current for a 5V input voltage for 500kHz, 1MHz,
and 1.5MHz f
SW
.
Figure 2. Conversion Efficiency Versus Output Current
Turn-on Waveform
A soft-start sequence occurs when applying power to the LM21212-1 evaluation board. Figure 3 shows
the output voltage during a typical start-up sequence.
Figure 3. (2 ms/DIV)
Output Ripple Waveform
Figure 4 shows the output voltage ripple. This measurement was taken with the scope probe tip placed on
the output capacitor C9 VOUT connection and the scope probe ground "barrel" wired to the GND
connection of C9. The scope bandwidth is set to 20 MHz.
4
AN-2107 LM21212-1 Evaluation Board SNVA467B–February 2011–Revised May 2013
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