Rainbow-electronics MAX16822B Manual de usuario descargar pdf (Pagina 5)

MAX16822A/MAX16822B

2MHz, High-Brightness LED Drivers with

Integrated MOSFET and High-Side Current Sense

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

= V

DIM

= 48V, C

VCC

= 1µF, R

SENSE

= 0.62Ω, L = 220µH (connected between IN and CS). Typical values are at T

= +25°C,

unless otherwise noted.)

RDSON

vs. TEMPERATURE

MAX16822A toc11

TEMPERATURE (°C)

RDSON

(Ω)

1109580655035205-10-25

0.5

0.6

0.7

0.8

0.9

1.0

0.4

-40 125

= 6.5V

= 65V

= 48V

TEMP_I

vs. TEMPERATURE

MAX16822A toc12

TEMP_

(μA)

25.5

26.0

26.5

27.0

27.5

28.0

28.5

29.0

29.5

30.0

25.0

TEMPERATURE (

1109580655035205-10-25-40 125

= 48V

Pin Description

PIN NAME FUNCTION

1 CS Current-Sense Input. Connect a resistor between IN and CS to program the LED current.

2 IN Positive Supply Voltage Input. Bypass with a 1µF or higher value capacitor to GND.

3 GND Ground

4 PGND Power Ground

5, 6 LX Switching Node

7 DIM

Logic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to

enable the current regulator.

8 TEMP_I

Thermal Foldback Control and Linear Input. Bypass with a 0.01µF capacitor to GND if thermal

foldback or analog dimming is used. See the Thermal Foldback section for more details.

Detailed Description

The MAX16822A/MAX16822B are step-down, constant-

current, high-brightness LED (HB LED) drivers. These

devices operate from a +6.5V to +65V input-voltage

range and deliver up to 350mA of output current. A high-

side current-sense resistor sets the output current and a

dedicated PWM dimming input enables pulsed LED

dimming over a wide range of brightness levels.

A high-side current-sensing scheme and an on-board

current-setting circuitry minimize the number of exter-

nal components while delivering LED current with ±3%

accuracy, using a 1% sense resistor. See Figure 1 for

an internal block diagram.

1 2 3 4 5 6 7 8 9 10

MAX16822A/MAX16822B 1

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