Rainbow-electronics MAX1855 Manual do Utilizador descarregar pdf (Página 8)

MAX1716/MAX1854/MAX1855

High-Speed, Adjustable, Synchronous Step-Down

Controllers with Integrated Voltage Positioning

8 _______________________________________________________________________________________

100

0.01 0.1 1 10 100

EFFICIENCY vs.

LOAD CURRENT (1.0V AT 400kHz)

MAX1716-09

LOAD CURRENT (A)

EFFICIENCY (%)

CIRCUIT #3

MAX1716-10

1.50

1.54

1.52

1.58

1.56

1.62

1.60

1.64

010515

LOAD CURRENT (A)

20 25

BATT

= 24V

BATT

= 7V

OUTPUT VOLTAGE vs. LOAD CURRENT

(1.6V AT 300kHz)

OUTPUT VOLTAGE (V)

PWM MODE

SKIP MODE

1.20

1.24

1.22

1.28

1.26

1.32

1.30

1.34

0462 8 10 12 14

OUTPUT VOLTAGE vs.

LOAD CURRENT (1.3V AT 300kHz)

MAX1716-11

LOAD CURRENT (A)

OUTPUT VOTLAGE (V)

CIRCUIT #2

L = 1.0µH

BATT

= 24V

BATT

= 7V

PWM MODE

SKIP MODE

0.92

0.96

0.94

1.00

0.98

1.02

0462 8 10 12 14

OUTPUT VOLTAGE vs.

LOAD CURRENT (1.0V AT 400kHz)

MAX1716-12

LOAD CURRENT (A)

OUTPUT VOTLAGE (V)

CIRCUIT #3

BATT

= 24V

BATT

= 7V

PWM MODE

SKIP MODE

100

200

150

300

250

350

084 121620

SWITCHING FREQUENCY

vs. LOAD CURRENT

MAX1716-13

LOAD CURRENT (A)

FREQUENCY (kHz)

PWM MODE

SKIP MODE

BATT

= 7V

OUT(PROG)

= 1.6V

260

280

270

300

290

310

320

08124 162024

SWITCHING FREQUENCY

vs. BATTERY VOLTAGE

MAX1716 -14

BATT

(V)

FREQUENCY (kHz)

OUT(PROG)

= 1.6V

OUT(PROG)

= 0.925V

OUT

= 12A

270

290

280

310

300

320

330

-40 10-15 356085

SWITCHING FREQUENCY

vs. TEMPERATURE

TEMPERATURE (°C)

SWITCHING FREQUENCY (kHz)

MAX1716-15

OUT

= 12A

OUT

= 5A

OUT

= 1A

0.74

0.78

0.76

0.82

0.80

0.86

0.84

0.88

ON-TIME (µs)

MAX1716-16

-40 10-15 35 60 85

ON-TIME vs. TEMPERATURE

TEMPERATURE (°C)

OUT

= 12A

OUT

= 5A

OUT

= 1A

-6

-2

-4

CURRENT-LIMIT ERROR (%)

MAX1716-17

-40 10-15 356085

NORMALIZED CURRENT-LIMIT ERROR

vs. TEMPERATURE

TEMPERATURE (°C)

Typical Operating Characteristics (continued)

(Circuit from Figure 1, components from Table 2, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 32 33

MAX1716/MAX1854/MAX1855 1

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