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Rainbow-electronics MAX16825 Manual de usuario Pagina 1

Busca en linea o descarga Manual de usuario para Software Rainbow-electronics MAX16825. Rainbow Electronics MAX16825 User Manual Manual de usuario

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General Description
The MAX16824/MAX16825 three-channel LED drivers
operate over a 6.5V to 28V input voltage range. These
devices provide three open-drain constant-current-sink-
ing outputs that are rated to 36V and deliver up to
150mA of current to each string of high-brightness LEDs
(HB LEDs). The current at each output is programmable
by means of an external current-sense resistor. The
MAX16824 features three PWM inputs that control the
duty cycle of the output current, allowing a wide LED
dimming range to be implemented. The PWM inputs
also function as on/off control for each corresponding
output. The MAX16825 offers a 4-wire serial interface, a
3-bit shift register, and a 3-bit transparent latch. The ser-
ial interface allows a microcontroller to configure the out-
put channels using four inputs (DIN, CLK, LE, OE) and a
data output (DOUT). DOUT allows multiple drivers to be
cascaded and operated together.
The MAX16824/MAX16825’s on-board pass elements
minimize the need for external components, while at the
same time, providing ±5% LED current accuracy.
Additional features include a +5V (±5%) regulated output
with 4mA output current capability and thermal protection.
The MAX16824/MAX16825 are available in a thermally
enhanced 16-pin TSSOP-EP package and specified over
the -40°C to +125°C temperature range.
Applications
Industrial Lighting
Architectural and Decorative Lighting
Mood Lighting
Indoor and Outdoor LED Video Displays
Automotive Lighting
LCD Display Backlighting
Features
o 6.5V to 28V Operating Range
o Outputs Connected to 36V Supply for Long LED
Strings
o Three 36V-Rated Output Channels with
Independently Adjustable LED Current
o 150mA Output Current Per Channel
o ±5% LED Current Accuracy
o PWM Dimming
Three Independent Dimming Control Inputs
(MAX16824)
4-Wire Serial Interface LED Current Chopping
(MAX16825)
o +5V (±5%) Regulated Output with 4mA Source
Capability
o Fast Transient Dimming Response
o 200mV Current-Sense Reference Reduces Power
Loss
o Thermal Shutdown
o -40°C to +125°C Operating Temperature Range
o Thermally Enhanced, 16-Pin TSSOP Exposed
Paddle Package
MAX16824/MAX16825
High-Voltage, Three-Channel Linear
High-Brightness LED Drivers
________________________________________________________________
Maxim Integrated Products
1
19-1107; Rev 1; 1/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
OUT1
OUT3
OUT2
CS1
CS2
CS3
IN
1
16
3
7
8
9
4
11
12
2
15
13
PWM1
PWM2
PWM3
REG
GND
C
REG
C
IN
V
IN
UP TO 36V
R
CS2
R
CS1
R
CS3
MAX16824
Typical Operating Circuits
Ordering Information
PART TEMP RANGE
PIN
PACKAGE
PKG
CODE
MAX16824AUE+ -40°C to +125°C 16 TSSOP-EP* U16E-3
MAX16825AUE+ -40°C to +125°C 16 TSSOP-EP* U16E-3
+
Denotes a lead-free package.
*
EP = Exposed paddle.
Pin Configurations appear at end of data sheet.
OUT1
OUT3
OUT2
CS1
CS2
CS3
IN
CLK
DIN
LE
REG
GND
C
REG
C
IN
V
IN
R
CS2
R
CS1
R
CS3
OE
MICROCONTROLLER
MAX16825
1
16
3
6
7
8
9
4
11
12
2
15
13
UP TO 36V
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Indice de contenidos

Pagina 1 - High-Brightness LED Drivers

General DescriptionThe MAX16824/MAX16825 three-channel LED driversoperate over a 6.5V to 28V input voltage range. Thesedevices provide three open-drai

Pagina 2

MAX16824/MAX16825Pulse-Width Dimming (MAX16825)The MAX16825 provides three methods of pulsed-widthcurrent dimming. One method of pulse dimming the out

Pagina 3

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers________________________________________________________________________

Pagina 4

MAX16824/MAX16825Another method of pulse dimming the outputs is to holdLE high and drive OE with a PWM signal. Because theinput bits are always latche

Pagina 5

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers________________________________________________________________________

Pagina 6

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers14 _____________________________________________________________________

Pagina 7

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED DriversMaxim cannot assume responsibility for use of any circuitry other than c

Pagina 8

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers2 ______________________________________________________________________

Pagina 9

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers________________________________________________________________________

Pagina 10

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers4 ______________________________________________________________________

Pagina 11

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers________________________________________________________________________

Pagina 12

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers6 ______________________________________________________________________

Pagina 13

Detailed DescriptionThe MAX16824/MAX16825 are three-channel LED dri-vers that operate from a 6.5V to 28V input voltagerange. These devices provide thr

Pagina 14

MAX16824/MAX16825High-Voltage, Three-Channel LinearHigh-Brightness LED Drivers8 ______________________________________________________________________

Pagina 15

On-board pass elements minimize the need for externalcomponents while providing ±5% LED current accura-cy. Additional features include a +5V (±5%) reg

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