Rainbow-electronics MAX8720 Manual do Utilizador descarregar pdf (Página 7)

MAX8720

Dynamically Adjustable 6-Bit VID

Step-Down Controller

_______________________________________________________________________________________ 7

EFFICIENCY vs. LOAD CURRENT

OUT

= 1.25V)

MAX8720 toc01

LOAD CURRENT (A)

EFFICIENCY (%)

1010.1

100

0.01 100

= 12V

= 20V

= 7V

SKIP = GND

SKIP = V

OUTPUT VOLTAGE vs. LOAD CURRENT

OUT

= 1.25V)

MAX8720 toc02

LOAD CURRENT (A)

OUTPUT VOLTAGE (V)

15105

1.250

1.255

1.245

020

SKIP MODE

PWM MODE

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

MAX8720 toc04

INPUT VOLTAGE (V)

FREQUENCY (kHz)

201510

290

300

310

320

330

340

350

360

280

525

OUT

= 18A

OUT

= 3A

SKIP = V

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE (PWM MODE)

MAX8720 toc05

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

201510

525

+ I

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE (SKIP MODE)

MAX8720 toc06

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

201510

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

525

+ I

1.990

1.994

2.002

1.998

2.006

2.010

-20 200406080100

REFERENCE LOAD REGULATION

MAX8720 toc07

REF

(µA)

REFERENCE VOLTAGE (V)

Typical Operating Characteristics

(MAX8720 Circuit of Figure 1, V

= 12V, V

= V

= 5V, TON = open, T

= +25°C, unless otherwise noted.)

SWITCHING FREQUENCY

vs. LOAD CURRENT

MAX8720 toc03

LOAD CURRENT (A)

SWITCHING FREQUENCY (kHz)

15105

100

200

300

400

020

PWM MODE

SKIP MODE

1 2 3 4 5 6 7 8 9 10 11 12 ... 30 31

Step-Down Controller 1

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