Rainbow-electronics MAX8548 Manual de usuario Pagina 6

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MAX8545/MAX8546/MAX8548
Low-Cost, Wide Input Range, Step-Down
Controllers with Foldback Current Limit
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
IN
= V
L
= V
CC
= 5V, typical values are at T
A
= +25°C, unless otherwise noted.)
V
OUT
1V/div
V
IN
5V/div
INDUCTOR
CURRENT
5A/div
1ms/div
START-UP WAVEFORM
MAX8545 toc15
I
LOAD
= 3A
V
OUT
1V/div
V
IN
5V/div
INDUCTOR
CURRENT
2A/div
2ms/div
SHUTDOWN WAVEFORM
MAX8545 toc16
I
LOAD
= 3A
V
OUT
2V/div
V
IN
5V/div
I
IN
10A/div
I
OUT
5A/div
SHORT-CIRCUIT WAVEFORM
MAX8545 toc18
GAIN AND PHASE vs. FREQUENCY
MAX8545/46/48 toc19
FREQUENCY (kHz)
GAIN (dB)
PHASE (DEGREES)
101
-120
-100
-80
-60
-40
-20
0
20
40
60
-140
0.1 100
180
150
120
90
60
30
V
IN
= 17V, V
OUT
= 2.5V
I
LOAD
= 6A
GAIN
PHASE
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