Rainbow-electronics MAX1717 Manual do Utilizador descarregar pdf (Página 6)

MAX1717

Dynamically Adjustable, Synchronous

Step-Down Controller for Notebook CPUs

6 _______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1, components of Table 1, V+ = +12V, V

= V

= SKP/SDN = +5V, V

OUT

= 1.6V, T

= +25°C, unless otherwise noted.)

0.01 1010.1

EFFICIENCY vs. LOAD CURRENT

300kHz STANDARD APPLICATION,

CIRCUIT 1

100

MAX1717 toc01

LOAD CURRENT (A)

EFFICIENCY (%)

SKIP MODE, V+ = 7V

SKIP MODE, V+ = 12V

SKIP MODE,

V+ = 20V

PWM MODE,

V+ = 7V

PWM MODE, V+ = 12V

PWM MODE, V+ = 20V

0.01 1010.1

EFFICIENCY vs. LOAD CURRENT

300kHz VOLTAGE POSITIONED, CIRCUIT 2

100

MAX1717 toc02

LOAD CURRENT (A)

EFFICIENCY (%)

SKIP MODE, V+ = 7V

SKIP MODE, V+ = 12V

SKIP MODE,

V+ = 20V

PWM MODE,

V+ = 12V

PWM MODE,

V+ = 20V

PWM

MODE,

V+ = 7V

0.01 1010.1

EFFECTIVE EFFICIENCY vs. LOAD CURRENT

300kHz VOLTAGE POSITIONED, CIRCUIT 2

100

MAX1717 toc03

NONPOSITIONED LOAD CURRENT (A)

EFFECTIVE EFFICIENCY (%)

SKIP MODE, V+ = 7V

SKIP MODE, V+ = 12V

SKIP MODE,

V+ = 20V

PWM MODE,

V+ = 7V

PWM MODE, V+ = 12V

PWM MODE, V+ = 20V

0.01 1010.1

EFFICIENCY vs. LOAD CURRENT

550kHz VOLTAGE POSITIONED, CIRCUIT 3

100

MAX1717 toc04

LOAD CURRENT (A)

EFFICIENCY (%)

SKIP MODE, V+ = 7V

SKIP MODE, V+ = 12V

SKIP MODE,

V+ = 20V

PWM MODE,

V+ = 12V

PWM MODE,

V+ = 7V

PWM MODE, V+ = 20V

0.01 1010.1

EFFECTIVE EFFICIENCY vs. LOAD CURRENT

550kHz VOLTAGE POSITIONED, CIRCUIT 3

100

MAX1717 toc05

NONPOSITIONED LOAD CURRENT (A)

EFFECTIVE EFFICIENCY (%)

SKIP MODE, V+ = 7V

SKIP MODE, V+ = 12V

SKIP MODE,

V+ = 20V

PWM MODE,

V+ = 12V

PWM MODE,

V+ = 7V

PWM MODE, V+ = 20V

0.01 1010.1

EFFICIENCY vs. LOAD CURRENT

1000kHz, +5V, CIRCUIT 4

100

MAX1717 toc06

LOAD CURRENT (A)

EFFICIENCY (%)

SKIP MODE

PWM MODE

0.01 1010.1

EFFECTIVE EFFICIENCY vs. LOAD CURRENT

1000kHz, +5V, CIRCUIT 4

100

MAX1717 toc07

NONPOSITIONED LOAD CURRENT (A)

EFFECTIVE EFFICIENCY (%)

SKIP MODE

PWM MODE

0.01 1010.1

EFFICIENCY vs. LOAD CURRENT

1000kHz VOLTAGE POSITIONED,

CIRCUIT 5

100

MAX1717 toc08

LOAD CURRENT (A)

EFFICIENCY (%)

SKIP MODE, V+ = 7V

SKIP MODE, V+ = 12V

SKIP MODE,

V+ = 20V

PWM MODE,

V+ = 20V

PWM MODE,

V+ = 12V

PWM MODE,

V+ = 7V

0.01 1010.1

EFFECTIVE EFFICIENCY vs. LOAD CURRENT

1000kHz VOLTAGE POSITIONED,

CIRCUIT 5

100

MAX1717 toc09

NONPOSITIONED LOAD CURRENT (A)

EFFECTIVE EFFICIENCY (%)

SKIP MODE, V+ = 7V

SKIP MODE, V+ = 12V

SKIP MODE,

V+ = 20V

PWM MODE,

V+ = 20V

PWM MODE,

V+ = 12V

PWM MODE,

V+ = 7V

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