Rainbow-electronics MAX6948B Manual do Utilizador descarregar pdf (Página 19)

High-Efficiency PWM LED Driver with Boost

Converter and Five Constant-Current GPIO Ports

MAX6948B

Figure 4. Ramp-Up Behavior

Figure 5. Hold-Off and Ramp-Down Behavior

Table 11. Port Ramp-Down Register Format (0x11)

EXIT SHUTDOWN COMMAND

FULL CURRENT/

HALF CURRENT

1s 2s1/4s 1/2s

1/8s

1/16s

ZERO TO 4s CURRENT RAMP-UP AFTER CS RUN

ZERO TO 4s HOLD-OFF DELAY BEFORE RAMP-DOWN

ZERO TO 4s CURRENT RAMP-DOWN AFTER HOLD-OFF DELAY

1s 2s 4s 1s 2s

1/8s

1/16s

1/8s

1/16s

ZERO TO 8s CURRENT RAMP-DOWN

4s1/4s 1/2s 1/4s 1/2s

FULL CURRENT/

HALF CURRENT

D7 D6 D5 D4 D3 D2 D1 D0

RESERVED HOLD-OFF RAMP-DOWN

Immediately shuts down after hold-off delay X X X X X 0 0 0

0.0655s ramp-down from full current after

hold-off delay

X X X X X 0 0 1

0.131s ramp-down from full current after

hold-off delay

X X X X X 0 1 0

0.262s ramp-down from full current after

hold-off delay

X X X X X 0 1 1

0.524s ramp-down from full current after

hold-off delay

X X X X X 1 0 0

1.049s ramp-down from full current after

hold-off delay

X X X X X 1 0 1

2.097s ramp-down from full current after

hold-off delay

X X X X X 1 1 0

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 27 28

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