MAX6983AUG+T【PDF 9/13 页】IC LED DRIVER LINEAR 24-TSSOP

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16-Port, 36V Constant-Current LED Driver with

LED Fault Detection and Watchdog

Table 1. 4-Wire Serial-Interface Truth Table

SERIAL CLOCK

DATA INPUT

SHIFT REGISTER

CONTENTS

LOAD

INPUT

LATCH CONTENTS

BLANKING

INPUT

OUTPUT CONTENTS

INPUT

DIN

CLK

D 0

D 1

D 2

… D n-1 D n

LE

D 0

D 1

D 2

… D n-1 D n

OE

D 0

D 1

D 2

… D n-1 D n

H

L

X

H

L

R 0

R 1

R 1

R 1

R 2

R 2

R 2

… R n-2 R n-1

… R n-2 R n-1

… R n-1 R n

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

X

X

X

…

X

X

H

R 0

R 1

R 2

R n-1 R n

—

—

—

—

—

—

—

—

—

P 1

P 2

P 3

… P n-1 P n

L

P 0

P 1

P 2

… P n-1 P n

L

P 0

P 1

P 2

… P n - 1 P n

—

—

—

—

—

—

—

—

—

X

X

X

…

X

X

H

Hi-Z Hi-Z Hi-Z … Hi-Z Hi-Z

L = Low-logic level; H = High-logic level; X = Don’t care; P = Present state; R = Previous state.

Applications Information

Selecting External Component R SET to Set

LED Output Current

The MAX6983 uses an external resistor, R SET, to set the

LED current for outputs OUT0–OUT15. The minimum

allowed value of R SET is 327.3 ? , which sets the output

currents to 55mA. The maximum allowed value of R SET

is 5k ? . The reference value, 360 ? , sets the output cur-

rents to 50mA. To set a different output current, use the

formula:

R SET = 18,000 / I OUT

where I OUT is the desired output current in mA.

Computing Power Dissipation

The upper limit for power dissipation (P D ) for the

MAX6983 is determined by the following equation:

P D = (V+ x I+) + (V OUT x DUTY x I OUT x N)

where:

V+ = supply voltage

I+ = operating supply current when sinking I OUT LED

drive current into N outputs

DUTY = PWM duty cycle applied to OE

N = number of MAX6983 outputs driving LEDs at the

same time (maximum is 16)

V OUT = MAX6983 port output voltage when driving load

LED(s)

I OUT = LED drive current programmed by R SET

P D = power dissipation, in mW if currents are in mA

Dissipation example:

I OUT = 20mA, N = 16, DUTY = 1,

V OUT = 2V, V+ = 5.25V

P D = (5.25V x 25mA) + (2V x 1 x 20mA x 16) = 0.77W

Thus, for a 24-pin TSSOP package (T JA = 1 / 0.0122 =

+82°C/W from the Absolute Maximum Ratings ), the

maximum allowed ambient temperature T A is given by:

T J(MAX) = T A + (P D x T JA ) = +150°C =

T A + (0.77 x 82°C/W)

so T A = +85°C.

Overtemperature Cutoff

The MAX6983 contains an internal temperature sensor

that turns off all outputs when the die temperature

exceeds approximately +165°C. The outputs are

enabled again when the die temperature drops below

approximately +140°C. Register contents are not affect-

ed, so when a driver is overdissipating, the external

symptom is the load LEDs cycling between on and off as

the driver repeatedly overheats and cools, alternately

turning the LEDs off and then back on again.

Power-Supply Considerations

The MAX6983 operates with a chip supply V+, and one

or more LED supplies. Bypass each supply to GND

with a 0.1μF capacitor as close to the MAX6983 as pos-

sible. This is normally adequate for static LED driving.

For multiplex or PWM applications, it is necessary to

add an additional bulk electrolytic capacitor of 4.7μF or

more to each supply for every 4 to 16 MAX6983s. The

necessary capacitance depends on the LED load cur-

rent, PWM switching frequency, and serial interface

speed. Inadequate V+ decoupling can cause timing

problems, and very noisy LED supplies can affect LED

current regulation.

_______________________________________________________________________________________

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