Analog Devices ADP1872-EVALZ, User Manual

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ADP1872-EVALZ/ADP1873-EVALZ User Guide UG-057
Rev. A | Page 7 of 20
CH1 50mV
B
W
CH2 5A Ω
CH3 10V
B
W
CH4 5V
M400ns A CH2 3.90A
T 35.8%
1
2
3
4
OUTPUT VOLTAGE
INDUCTOR CURRENT
SW NODE
LOW SIDE
08548-
043
Figure 9. Power Saving Mode (PSM) Operational Waveform, 100 mA
CH1 50mV
B
W
CH2 5A Ω
CH3 10V
B
W
CH4 5V
M4.0µs A CH2 3.90A
T 35.8%
1
2
3
4
OUTPUT VOLTAGE
INDUCTOR CURRENT
SW NODE
LOW SIDE
08548-
044
Figure 10. PSM Waveform at Light Load, 500 mA
CH1 5A Ω
CH3 10V
CH4 100mV
B
W
M400ns A CH3 2.20V
T 30.6%
1
3
4
OUTPUT VOLTAGE
INDUCTOR CURRENT
SW NODE
08548-
045
Figure 11. CCM Operation at Heavy Load, 18 A
(See Figure 28 for Application Circuit)
CH1 10A Ω CH2 200mV
B
W
CH3 20V CH4 5V
M2ms A CH1 3.40A
T 75.6%
1
2
3
4
OUTPUT VOLTAGE
20A STEP
SW NODE
LOW SIDE
08548-
046
Figure 12. Load Transient Step—PSM Enabled, 20 A
(See Figure 28 for Application Circuit)
CH1 10A Ω CH2 200mV
B
W
CH3 20V CH4 5V
M20µs A CH1 3.40A
T 30.6%
1
2
3
4
OUTPUT VOLTAGE
20A POSITIVE STEP
SW NODE
LOW SIDE
08548-
047
Figure 13. Positive Step During Heavy Load Transient Behavior—PSM Enabled,
20 A, V
OUT
= 1.8 V (See Figure 28 for Application Circuit)
CH1 10A Ω CH2 200mV
B
W
CH3 20V CH4 5V
M20µs A CH1 3.40A
T 48.2%
1
2
3
4
OUTPUT VOLTAGE
20A NEGATIVE STEP
SW NODE
LOW SIDE
08548-
048
Figure 14. Negative Step During Heavy Load Transient Behavior—PSM Enabled,
20 A (See Figure 28 for Application Circuit)