ADP1875 Analog Devices, ADP1875 Datasheet - Page 15

• Manufacturer Part Number: ADP1875
• Description: Synchronous Buck Controller with Constant On-Time, Valley Current Mode, and Power Saving Mode
• Manufacturer: Analog Devices

Figure 48. Positive Step During Heavy Load Transient Behavior—PSM Enabled,
4
1
3
2
1
3
4
2
1
3
4
CH1 10A Ω
CH3 20V
CH1 5A Ω
CH3 10V
CH1 10A Ω
CH3 20V
12A POSITIVE STEP
Figure 47. Load Transient Step—PSM Enabled, 12 A
12 A, V
Figure 46. CCM Operation at Heavy Load, 12 A
LOW SIDE
OUT
(See Figure 99 for Application Circuit)
(See Figure 99 Application Circuit)
CH4 100mV
CH2 200mV
CH4 5V
= 1.8 V (See Figure 99 Application Circuit)
CH2 200mV
CH4 5V
B
B
B
W
W
W
M400ns
M20µs
SW NODE
T
T
M2ms
T
OUTPUT VOLTAGE
30.6%
30.6%
12A STEP
75.6%
SW NODE
OUTPUT VOLTAGE
OUTPUT VOLTAGE
INDUCTOR CURRENT
A CH1
A CH1
A CH3
SW NODE
LOW SIDE
3.40A
2.20V
3.40A
Rev. 0 | Page 15 of 44
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, 12 A, V
Figure 50. Load Transient Step—Forced PWM at Light Load, 12 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
SW NODE
12 A (See Figure 99 Application Circuit)
(See Figure 99 Application Circuit)
CH2 200mV
CH4 5V
CH2 5V
CH4 200mV
CH2 5V
CH4 200mV
OUTPUT VOLTAGE
OUT
12A STEP
LOW SIDE
= 1.8 V (See Figure 99 Application Circuit)
B
B
B
W
W
W
M20µs
M20µs
T
T
ADP1874/ADP1875
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