V-Tec C5-AT25/D4 Instrukcja Użytkownika Pobierz pdf (Strona 7)

MAX8520/MAX8521

Smallest TEC Power Drivers for

Optical Modules

_______________________________________________________________________________________ 7

SWITCHING FREQUENCY CHANGE vs. V

MAX8520/21 toc12

(V)

SWITCHING FREQUENCY CHANGE (kHz)

5.04.54.03.5

200

400

600

800

1000

1200

3.0 5.5

FREQ = 500kHz

FREQ = 1MHz

SWITCHING FREQUENCY vs. R

EXT

MAX8520/21 toc13

EXT

(kΩ)

SWITCHING FREQUENCY (kHz)

14012010080

500

600

700

800

900

1000

1100

400

60 160

= 3.3V

= 5V

STEP RESPONSE

MAX8520/21 toc19

10ms/div

2V/div

TEC

10mA/div

REFERENCE VOLTAGE CHANGE vs. V

MAX8520/21 toc14

(V)

REFERENCE VOLTAGE CHANGE (mV)

5.04.54.03.5

-1.2

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

-1.4

3.0 5.5

REF SOURCING 150µA

REFERENCE VOLTAGE CHANGE

vs. TEMPERATURE

MAX8520/21 toc15

TEMPERATURE (°C)

REFERENCE VOLTAGE CHANGE (mV)

8040 600 20-20

-4

-3

-2

-1

-5

-40

REF SOURCING 150µA

REFERENCE VOLTAGE CHANGE

vs. LOAD CURRENT

MAX8520/21 toc16

LOAD CURRENT (mA)

REFERENCE VOLTAGE CHANGE (mV)

0.80.60.40.2

-10

-8

-6

-4

-2

-12

0 1.0

STARTUP AND SHUTDOWN WAVEFORMS

MAX8520/21 toc17

200µs/div

SHDN

5V/div

TEC

500mA/div

200mA/div

0mA

CTLI STEP RESPONSE

MAX8520/21 toc18

1ms

CTLI

1V/div

TEC

1A/div

1.5V

Typical Operating Characteristics (continued)

= 5V, circuit of Figure 1, T

= +25°C unless otherwise noted)

1 2 3 4 5 6 7 8 9 10 11 12 ... 18 19

MAX8520/MAX8521 1
Optical Modules 1

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