Rainbow-electronics MAX669 Manual do Utilizador descarregar pdf (Página 6)

MAX668/MAX669

1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuits of Figures 2, 3, 4, and 5; T

= +25°C; unless otherwise noted.)

1.240

1.242

1.243

1.241

1.245

1.246

1.244

1.248

1.249

1.247

1.250

-40 -20 0 20 40 60 80 100

REFERENCE VOLTAGE vs.

TEMPERATURE

MAX668 toc10

TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

= 5V

100

150

250

300

200

400

450

350

500

0 100 200 300 400 500

SWITCHING FREQUENCY vs. R

OSC

MAX668 toc11

OSC

(kΩ)

SWITCHING FREQUENCY (kHz)

= 5V

100

300

400

500

600

-40 0-20 20 40 60 80 100

SWITCHING FREQUENCY vs.

TEMPERATURE

MAX668 toc12

TEMPERATURE (°C)

SWITCHING FREQUENCY (kHz)

200

100kΩ

165kΩ

499kΩ

= 5V

100 1000 10,000

EXT RISE/FALL TIME vs.

CAPACITANCE

MAX668 toc13

CAPACITANCE (pF)

EXT RISE/FALL TIME (ns)

, V

= 3.3V

, V

= 3.3V

, V

= 5V

, V

= 5V

1 2 3 4 5 6 7 8 9 10 11 ... 17 18

MAX668/MAX669 1
Controllers in µMAX 1

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