MAX16822A Просмотр технического описания (PDF) - Maxim Integrated

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MAX16822A

2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense

Maxim Integrated 

MAX16822A/MAX16822B

2MHz, High-Brightness LED

Drivers with Integrated MOSFET

and High-Side Current Sense

Typical Operating Characteristics (continued)

(VIN = VDIM = 48V, CVCC = 1µF, RSENSE = 0.62Ω, L = 220µH (connected between IN and CS). Typical values are at TA = +25°C,

unless otherwise noted.)

LXRDSON

vs. TEMPERATURE

1.0

VIN = 65V

0.9

0.8

VIN = 48V

0.7

VIN = 6.5V

0.6

0.5

0.4

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

ITEMP_I

vs. TEMPERATURE

30.0

29.5

29.0

28.5

28.0

27.5

27.0

26.5

26.0

25.5

VIN = 48V

25.0

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

Pin Description

PIN

NAME

1

CS

2

IN

3

GND

4

PGND

5, 6

LX

7

DIM

8

TEMP_I

FUNCTION

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

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

Ground

Power Ground

Switching Node

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

enable the current regulator.

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. The maximum output current is 500mA, if the

part is used at temperatures up to +105°C, or 350mA, if

it is used up to +125°C. 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.

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