Rainbow-electronics MAX726 Manual de usuario Pagina 8

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MAX724/MAX726
5A/2A Step-Down, PWM,
Switch-Mode DC-DC Regulators
8 _______________________________________________________________________________________
CONTINUOUS-CURRENT MODE (I
OUT
= 3A)
0
-0.5
V
D
I
P
= 3.4A
I
SW
0
0
I
P
= 3.4A
I
AVG
= I
OUT
= 3A
0
I
P
= 3.4A
I
AVG
= 2.1A
I
D
DISCONTINUOUS-CURRENT MODE 
(I
OUT
= 0.16A)
V
SW
VOLTAGE (TO GND)
(ALSO DIODE VOLTAGE)
5V/div
I
P
= 0.5A
SWITCH CURRENT
1A/div
INDUCTOR CURRENT
1A/div
DIODE CURRENT
1A/div
I
L
Figure 3. MAX724 Step-Down Converter Waveforms with V
IN
= 20V, L = 50µH (all waveforms 2µs/div)
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