MAX16835ATE+T【PDF 6/8 页】IC LED DRIVR HIGH BRIGHT 16-TQFN

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MAX16835

High-Voltage, 350mA, Adjustable Linear

High-Brightness LED Driver

power series pass device (see the Functional Diagram).

The regulation point is factory set at (V CS+ - V CS- ) =

200mV ±3.5%. The regulated current is user defined by

the value of R SENSE .

The MAX16835 is a current controller internally opti-

mized for driving the impedance range expected from

one or more HB LEDs.

+5V Regulator

The MAX16835 includes a fixed +5V output regulator

that delivers up to 4mA of load current for low-power

applications throughout the +6.5V to +40V input volt-

age range. Connect a 0.1μF compensation capacitor

from V5 to ground. Shorting V5 to ground disables the

thermal shutdown. When EN is low, V5 is off.

Thermal Protection

The MAX16835 enters a thermal-shutdown mode in the

event of overheating. This typically occurs in overload or

output short-circuit conditions. When the junction tem-

perature exceeds T J = +159°C (typ), the internal ther-

mal-protection circuitry turns off the series pass device.

The MAX16835 recovers from thermal-shutdown mode

once the junction temperature drops by 24°C (typ). The

part therefore protects itself by thermally cycling in the

event of a short-circuit or overload condition. Shorting V5

to ground disables the thermal shutdown.

Applications Information

Programming the LED Current

The MAX16835 uses a sense resistor across CS+ and

CS- to set the LED current. The differential sense amplifier

V EN

connected across R SENSE provides ground-loop immu-

nity and low-frequency noise rejection. The LED current

is given by the equation below:

I LED = V SENSE /R SENSE

Input Voltage Considerations

For proper operation, the minimum input voltage must

always be:

V IN(MIN) ≥ V SENSE(MAX) + V FT(MAX + ? V DO(MAX)

where V FT(MAX) is the total forward voltage of all series-

connected LEDs. The minimum operating voltage of the

device is +6.5V. The device operates below +6.5V;

However, the output current may not meet the full regu-

lation specification.

Low-Frequency PWM

at the Output

The MAX16835 provides pulsed or chopped current

dimming. Generally, HB LEDs are binned to match at

their full-rated current; however, LEDs from the same

bin exhibit poor matching at currents other than full-

rated current. To achieve uniformity, HB LED manufac-

turers recommend PWM pulsing of the LED current at

their full-rated value. There are two methods for pro-

ducing a PWM output. One method is by pulsing the

enable input (EN) while having a constant voltage at IN.

The other method is to connect EN to IN and pulse both

EN and IN. Both methods generate a regulated-ampli-

tude PWM current (variable duty cycle) that can pro-

vide control over the LED brightness (see Figures 1

and 2).

16

OUT

15

EN

14

N.C.

13

N.C.

16

OUT

15

EN

14

N.C.

13

N.C.

1

OUT

GND 12

I LED

1

OUT

GND 12

I LED

V IN

C1

2

3

IN

IN

MAX16835

V5 11

CS- 10

D1

C2

R SENSE

V IN

C1

2

3

IN

IN

MAX16835

V5 11

CS- 10

D1

C2

R SENSE

4

N.C.

CS+ 9

4

N.C.

CS+ 9

N.C.

5

N.C.

6

N.C.

7

N.C.

8

N.C.

5

N.C.

6

N.C.

7

N.C.

8

Figure 1. Pulse Application with V IN at a Constant Voltage

6

Figure 2. Pulse Application with EN Connected to V IN

Maxim Integrated

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