Rainbow-electronics MAX1717 Manual de usuario Pagina 7

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MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
_______________________________________________________________________________________ 7
400
300
200
100
0
063912
FREQUENCY vs. LOAD CURRENT
MAX1717 toc10
LOAD CURRENT (A)
FREQUENCY (kHz)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
SKIP MODE
PWM MODE
1250
1000
750
500
250
0
063912
FREQUENCY vs. LOAD CURRENT
MAX1717 toc11
LOAD CURRENT (A)
FREQUENCY (kHz)
1000kHz VOLTAGE POSITIONED, CIRCUIT 5
SKIP MODE
PWM MODE
400
350
300
250
200
51510 20 25
FREQUENCY vs. INPUT VOLTAGE
MAX1717 toc12
INPUT VOLTAGE (V)
FREQUENCY (kHz)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
I
OUT
= 12A
I
OUT
= 0.3A
1200
1000
800
600
400
51510 20 25
FREQUENCY vs. INPUT VOLTAGE
MAX1717 toc13
INPUT VOLTAGE (V)
FREQUENCY (kHz)
1000kHz VOLTAGE POSITIONED, CIRCUIT 5
I
OUT
= 12A
I
OUT
= 0.3A
300
310
330
320
340
350
-40 0-20 20 40 60 80 85
FREQUENCY vs. TEMPERATURE
MAX1717 toc14
TEMPERATURE (°C)
FREQUENCY (kHz)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
0
10
5
20
15
25
30
-40 0 20-20 40 60 8580
OUTPUT CURRENT AT CURRENT LIMIT
vs. TEMPERATURE
MAX1717 toc15
TEMPERATURE (°C)
CURRENT (A)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
0
1.0
0.5
2.0
1.5
2.5
3.0
0105 152025
CONTINUOUS-TO-DISCONTINUOUS
INDUCTOR CURRENT POINT
MAX1717 toc16
INPUT VOLTAGE (V)
LOAD CURRENT (A)
300kHz VOLTAGE POSITIONED, CIRCUIT 2
0
15
10
5
20
25
30
513117 9 15 17 19 21 23 25
INDUCTOR CURRENT PEAKS AND
VALLEYS vs. INPUT VOLTAGE
MAX1717 toc17
INPUT VOLTAGE (V)
INDUCTOR CURRENT (A)
AT CURRENT-LIMIT POINT
300kHz VOLTAGE POSITIONED, CIRCUIT 2
I
PEAK
I
VALLEY
1000
800
600
400
200
0
51510 20 25
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1717 toc18
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
300kHz VOLTAGE POSITIONED, CIRCUIT 2,
SKIP MODE
I
CC
+ I
DD
I+
Typical Operating Characteristics (continued)
(Circuit of Figure 1, components of Table 1, V+ = +12V, V
DD
= V
CC
= SKP/SDN = +5V, V
OUT
= 1.6V, T
A
= +25°C, unless otherwise noted.)
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