5 A/2 A S t e p -Do w n , P WM,
S w it c h -Mo d e DC-DC Re g u la t o rs
CONTINUOUS-CURRENT MODE (I
= 3A)
DISCONTINUOUS-CURRENT MODE
(I = 0.16A)
OUT
OUT
V
D
0
V
VOLTAGE (TO GND)
SW
-0.5
(ALSO DIODE VOLTAGE)
5V/div
I = 3.4A
P
4/MAX726
I
SW
I = 0.5A
P
0
SWITCH CURRENT
1A/div
I = 3.4A
P
I
L
I
= I = 3A
AVG OUT
0
INDUCTOR CURRENT
1A/div
I = 3.4A
P
I
D
0
DIODE CURRENT
1A/div
I
= 2.1A
AVG
Figure 3. MAX724 Step-Down Converter Waveforms with VIN = 20V, L = 50µH (all waveforms 2µs/div)
8
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