Datasheet

ADP1870/ADP1871 Data Sheet
Rev. B | Page 14 of 44
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
08730-045
Figure 46. CCM Operation at Heavy Load, 12 A
(See Figure 94 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
12A STEP
SW NODE
LOW SIDE
08730-046
Figure 47. Load Transient Step—PSM Enabled, 12 A
(See Figure 94 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
12A POSITIVE STEP
SW NODE
LOW SIDE
08730-047
Figure 48. Positive Step During Heavy Load Transient Behavior—PSM Enabled,
12 A, V
OUT
= 1.8 V (See Figure 94 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
12A NEGATIVE STEP
SW NODE
LOW SIDE
08730-048
Figure 49. Negative Step During Heavy Load Transient Behavior—PSM Enabled,
12 A (See Figure 94 Application Circuit)
CH1 10A Ω CH2 5V
CH3 20V CH4 200mV
B
W
M2ms A CH1 6.20A
T 15.6%
1
2
3
4
OUTPUT VOLTAGE
12A STEP
SW NODE
LOW SIDE
08730-049
Figure 50. Load Transient Step—Forced PWM at Light Load, 12 A
(See Figure 94 Application Circuit)
CH1 10A Ω CH2 5V
CH3 20V CH4 200mV
B
W
M20µs A CH1 6.20A
T 43.8%
1
2
3
4
OUTPUT VOLTAGE
12A POSITIVE STEP
SW NODE
LOW SIDE
08730-050
Figure 51. Positive Step During Heavy Load Transient Behavior—Forced PWM
at Light Load, 12 A, V
OUT
= 1.8 V (See Figure 94 Application Circuit)