Datasheet

UG-057 Evaluation Board User Guide
Rev. 0 | Page 8 of 20
CH1 10A  CH2 5V
CH3 20V CH4 200mV
B
W
M2ms A CH1 6.20A
T 15.6%
1
2
3
4
OUTPUT VOLTAGE
20A STEP
SW NODE
LOW SIDE
08548-049
Figure 15. Load Transient Step—Forced PWM at Light Load, 20 A
(See Figure 28 for Application Circuit)
CH1 10A  CH2 5V
CH3 20V CH4 200mV
B
W
M20µs A CH1 6.20A
T 43.8%
1
2
3
4
OUTPUT VOLTAGE
20A POSITIVE STEP
SW NODE
LOW SIDE
08548-050
Figure 16. Positive Step During Heavy Load Transient Behavior—Forced PWM
at Light Load, 20 A, V
OUT
= 1.8 V (See Figure 28 for Application Circuit)
CH1 10A  CH2 200mV
B
W
CH3 20V CH4 5V
M10µs A CH1 5.60A
T 23.8%
1
2
3
4
OUTPUT VOLTAGE
20A NEGATIVE STEP
SW NODE
LOW
SIDE
08548-051
Figure 17. Negative Step During Heavy Load Transient Behavior—Forced PWM
at Light Load, 20 A (See Figure 28 for Application Circuit)
CH1 2V
B
W
CH2 5A 
CH3 10V CH4 5V
M4ms A CH1 920mV
T 49.4%
1
2
3
4
OUTPUT VOLTAGE
INDUCTOR CURRENT
SW NODE
LOW SIDE
08548-052
Figure 18. Output Short-Circuit Behavior Leading to Hiccup Mode
CH1 5V
B
W
CH2 10A 
CH3 10V CH4 5V
M10µs A CH2 8.20A
T 36.2%
1
2
3
4
OUTPUT VOLTAGE
INDUCTOR CURRENT
SW NODE
LOW SIDE
08548-053
Figure 19. Magnified Waveform During Hiccup Mode
CH1 2V
B
W
CH2 5A 
CH3 10V CH4 5V
M2ms A CH1 720mV
T 32.8%
1
2
3
4
OUTPUT VOLTAGE
INDUCTOR CURRENT
SW NODE
LOW SIDE
08548-054
Figure 20. Start-Up Behavior at Heavy Load, 18 A, 300 kHz
(See Figure 28 for Application Circuit)