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Application Note 1517
Measured Data
The following data was acquired using a ZL2008EVAL1Z rev 2 evaluation board.
Efficiency
Adaptive diode emulation and adaptive frequency modes are disabled for these efficiency measurements.
90
88
86
84
82
80
78
76
74
0
2
4
6
8 10
12
14
16
OUTPUT CURRENT (A)
FIGURE 9. EFFICIENCY, V IN = 12V, V OUT = 1.2V
Ramp-up/Ramp-down Characteristics
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-0.2
0
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10
-0.2
0
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10
TIME (s)
FIGURE 10. RAMP UP
Dynamic Load Response
0.005
0
-0.005
-0.010
-0.015
0.030
0.025
0.020
0.015
0.010
0.005
0
-0.005
TIME (s)
FIGURE 11. RAMP DOWN
-0.020
0
0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
TIME (μs)
-0.010
0
0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
TIME (μs)
FIGURE 12. DYNAMIC RESPONSE, 7A TO 15A LOAD
STEP
13
FIGURE 13. DYNAMIC RESPONSE, 15A TO 7A LOAD
STEP
AN1517.1
March 15, 2010
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