ADP1882 Analog Devices, ADP1882 Datasheet - Page 14

• Manufacturer Part Number: ADP1882
• Description: Synchronous Current-Mode Buck Controller with Constant On-time and 0.8 V Reference Voltage
• Manufacturer: Analog Devices

ADP1882/ADP1883
Figure 48. Positive Step During Heavy Load Transient Behavior—PSM Enabled,
4
1
3
2
1
3
4
2
1
3
4
CH1 5A Ω
CH3 10V
CH1 10A Ω
CH3 20V
CH1 10A Ω
CH3 20V
20 A, V
12A POSITIVE STEP
Figure 47. Load Transient Step—PSM Enabled, 20 A
Figure 46. CCM Operation at Heavy Load, 18 A
LOW SIDE
OUT
(See Figure 92 for Applications Circuit)
(See Figure 92 for Applications Circuit)
= 1.8 V (See Figure 92 for Applications Circuit)
CH4 100mV
CH2 200mV
CH4 5V
CH2 200mV
CH4 5V
B
B
B
W
W
W
M400ns
M20µs
T
SW NODE
T
M2ms
T
OUTPUT VOLTAGE
30.6%
30.6%
12A STEP
75.6%
SW NODE
OUTPUT VOLTAGE
INDUCTOR CURRENT
OUTPUT VOLTAGE
A CH1
A CH1
A CH3
SW NODE
LOW SIDE
2.20V
3.40A
3.40A
Rev. 0 | Page 14 of 40
Figure 51. Positive Step During Heavy Load Transient Behavior—Forced PWM
Figure 49. Negative Step During Heavy Load Transient Behavior—PSM Enabled,
at Light Load, 20 A, V
Figure 50. Load Transient Step—Forced PWM at Light Load, 20 A
2
1
3
4
4
1
2
3
4
1
2
3
CH1 10A Ω
CH3 20V
CH1 10A Ω
CH3 20V
CH1 10A Ω
CH3 20V
12A POSITIVE STEP
OUTPUT VOLTAGE
20 A (See Figure 92 for Applications Circuit)
SW NODE
(See Figure 92 for Applications Circuit)
CH2 200mV
CH4 5V
CH2 5V
CH4 200mV
CH2 5V
CH4 200mV
OUT
OUTPUT VOLTAGE
= 1.8 V (See Figure 92 for Applications Circuit)
12A STEP
LOW SIDE
B
B
B
W
W
W
M20µs
M20µs
T
T
M2ms
T
48.2%
43.8%
OUTPUT VOLTAGE
12A NEGATIVE STEP
15.6%
LOW SIDE
SW NODE
A CH1
A CH1
A CH1
LOW SIDE
SW NODE
3.40A
6.20A
6.20A