Rainbow-electronics MAX16803 Manual de usuario descargar pdf (Pagina 7)

MAX16803

High-Voltage, 350mA, High-Brightness LED

Driver with PWM Dimming and 5V Regulator

_______________________________________________________________________________________ 7

Input-Voltage Considerations

For proper operation, the minimum input voltage must

always be:

IN(MIN)

≥ V

RSENSE(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; how-

ever, output current may not meet the full regulation

specification (see the Typical Operating Characteristics).

Low-Frequency PWM Dimming at the Output

The MAX16803 provides pulsed or chopped current

dimming input (DIM). The other method is to connect

DIM to V5 and EN to IN and pulse EN. Both methods

generate a regulated-amplitude PWM current (variable

duty cycle) that can provide control over the LED

brightness (see Figures 1 and 2).

Paralleling Multiple MAX16803s to Drive

One High-Power LED

For applications that require more than 350mA of LED

current, two or more MAX16803s can be paralleled

(see Figure 3). V

CS_

should not exceed 4.1V.

16 15 13

N.C.

GND

CS-

SENSE

CS+

MAX16803

N.C. N.C. N.C.N.C.

OUT EN DIMN.C.

OUT

DIM

LED

Figure 1. Dimming with EN Connected to V

at a Constant

Voltage and DIM Pulsed

16 15 13

N.C.

GND

CS-

SENSE

CS+

MAX16803

N.C. N.C. N.C.N.C.

OUT EN DIMN.C.

OUT

LED

Figure 2. Dimming with DIM Connected to V5, EN Connected

to V

MAX16803

OUT

CS+

CS-

GND

DIM

LEDs

MAX16803

OUT

CS+

CS-

GND

DIM

Figure 3. Paralleling MAX16803s

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

MAX16803 1
PACKAGE OUTLINE 12

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Rainbow-electronics MAX16803 Manual de usuario Pagina 7

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