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Typical Waveforms www.ti.com
11 Typical Waveforms
Note: All waveforms refer to Rev B design.
Figure 5. V
IN
= 10 V, I
OUT
= 1 A, illustrating Figure 6. V
IN
= 18 V, I
OUT
= 3 A Illustrating
Buck-Boost Operation Buck Operation
CH1: V
SW
= 20V/div; CH2: Q1 = 20V/div; CH1: V
SW
= 20V/div; CH2: Q1 = 20V/div;
CH3: Q2 = 10V/div; CH4: I
L
= 5A/div CH3: Q2 = 10V/div; CH4: I
L
= 2A/div
Figure 7. Buck Mode Transient Response Figure 8. Buck-Boost Mode Transient Response
CH2: V
OUT
ripple (ac coupled); CH4: I
OUT
CH2: V
OUT
ripple (ac coupled); CH4: I
OUT
6
AN-2205 LM25118 Evaluation Board SNVA614B–January 2012–Revised January 2014
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