Rainbow-electronics MAX6948B Manual do Utilizador descarregar pdf (Página 7)

High-Efficiency PWM LED Driver with Boost

Converter and Five Constant-Current GPIO Ports

7

MAX6948B

Typical Operating Characteristics (continued)

(V+ = 3.3V, V

DD

= 2.5V, T

A

= +25NC, unless otherwise noted.)

5.5

5.6

5.7

5.8

5.9

6.0

5.4

MAX6948B toc10

SUPPLY CURRENT (mA)

V+ (V)

SUPPLY CURRENT vs. V+

(BOOST ON, 10% PWM,

FULL CURRENT AND HALF CURRENT)

T

A

= -40NC, +25NC, +85NC, +105NC

4.544.083.623.162.70 5.00

SUPPLY CURRENT vs. V+

(BOOST ON, 50% PWM,

FULL CURRENT AND HALF CURRENT)

V+ (V)

SUPPLY CURRENT (mA)

5.8

5.9

6.0

6.1

6.3

6.2

6.4

6.5

5.7

MAX6948B toc11

4.544.083.623.162.70 5.00

T

A

= -40NC, +25NC, +85NC, +105NC

6.3

6.4

6.5

6.6

6.7

6.8

6.9

7.0

7.1

7.2

6.2

SUPPLY CURRENT vs. V+

(BOOST ON, 10% PWM,

FULL CURRENT AND HALF CURRENT)

MAX6948B toc12

T

A

= -40NC, +25NC, +85NC, +105NC

V+ (V)

SUPPLY CURRENT (mA)

4.544.083.623.162.70 5.00

DELTA SUPPLY CURRENT P2 vs. V+

(DIFFERENCE IN CURRENT

FROM PORT OFF TO ON)

V+ (V)

DELTA SUPPLY CURRENT P2 (mA)

5.35

5.40

5.45

5.50

5.60

5.55

5.65

5.70

5.30

MAX6948B toc14

4.544.083.623.162.70 5.00

+25NC, +85NC, +105NC

-40NC

OUTPUT SINKING CURRENT

vs. V

PORT

MAX6948B toc15

V

PORT

(V)

OUTPUT SINKING CURRENT (mA)

4321

10

20

30

40

0

0 5

FULL-CURRENT PO

V+ = 5V

HALF-CURRENT PO

FULL-CURRENT P2

HALF-CURRENT P2

OUTPUT SINKING CURRENT

vs. V

PORT

MAX6948B toc16

V

PORT

(V)

OUTPUT SINKING CURRENT (mA)

0.80.60.40.2

10

20

30

40

0

0 1.0

FULL-CURRENT PO

HALF-CURRENT PO

FULL-CURRENT P2

HALF-CURRENT P2

V+ = 5V

STAGGER PWM PORT WAVEFORMS

vs. TIME ALL (50% PWM)

MAX6948B toc17

P0

P2

P3

P1

P4

BOOST

1ms/div

DELTA SUPPLY CURRENT P0 vs. V+

(DIFFERENCE IN CURRENT FROM

PORT OFF TO ON)

V+ (V)

DELTA SUPPLY CURRENT P0 (mA)

5.35

5.40

5.45

5.50

5.60

5.55

5.65

5.70

5.30

MAX6948B toc13

4.544.083.623.162.70 5.00

+25NC, +85NC, +105NC

-40NC

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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