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參數(shù)資料
| 型號(hào)： | MAX1561ETA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs |
| 中文描述： | LED DISPLAY DRIVER, DSO8 |
| 封裝： | 3 X 3 MM, 0.80 MM PITCH, DFN-8 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 245K |
| 代理商： | MAX1561ETA |
Design Procedure
Adjusting LED Current
Adjusting the MAX1561/MAX1599s
’
output current
changes the brightness of the LEDs. An analog input
(CTRL) and the sense-resistor value set the output cur-
rent. Output current is given by:
V
R
×
10
The V
CTRL
voltage range for adjusting output current is
0.24V to 1.62V. To set the maximum current, calculate
R
SENSE
when V
CTRL
is at its maximum as follows:
Power dissipation in R
SENSE
is typically less than 5mW,
making a standard chip resistor sufficient.
PWM Dimming Control
CTRL is also used as a digital input allowing LED bright-
ness control with a logic-level PWM signal applied direct-
ly to CTRL. The frequency range is from 200Hz to
200kHz, while 0% duty cycle corresponds to zero cur-
rent and 100% duty cycle corresponds to full current.
The error amplifier and compensation capacitor form a
lowpass filter so PWM dimming results in DC current to
the LEDs without the need for any additional RC filters;
see the
Typical Operating Characteristics
.
Capacitor Selection
The exact values of input and output capacitors are not
critical. The typical value for the input capacitor is
2.2μF and the typical value for the output capacitor is
0.1μF. Larger value capacitors can be used to reduce
R
V
I
SENSE
LED MAX
(
=
×
1 62
.
10
)
I
LED
CTRL
SENSE
=
M
High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
_______________________________________________________________________________________
7
SLOPE COMP
CURRENT SENSE
f
OSC
OVERVOLTAGE
PROTECTION
g
m
170mV
450k
50k
CTRL
SHUTDOWN TIMER
SHUTDOWN
GND
PWM CONTROL
OUT
COMP
CS
PGND
IN
LX
INPUT
2.6V TO 5.5V
L1
2.2
μ
F
C
OUT
0.1
μ
F
C
COMP
0.1
F
UP TO 26V
2 TO 6 LEDS
R
SENSE
7.5
PWM OR
ANALOG
DIMING
MAX1561
MAX1599
Figure 1. Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1561 | High-Efficiency. 26V Step-Up Converters for Two to Six White LEDs |
| MAX1599 | High-Efficiency. 26V Step-Up Converters for Two to Six White LEDs |
| MAX1599ETA | High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs |
| MAX1562-MAX1563 | Programmable 4A USB Current-Limited Switches with Autoreset and Fault Blanking |
| MAX1562 | Programmable. 4A. USB. Current-Limited Switches with Autoreset and Fault Blanking |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1561ETA+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 6SEGMENT 3.3V/5V 8TDFN EP - Rail/Tube |
| MAX1561ETA+T | 功能描述:LED照明驅(qū)動(dòng)器 26V StepUp Converter for 2-6 White LEDs RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1561ETA-T | 功能描述:LED照明驅(qū)動(dòng)器 26V StepUp Converter for 2-6 White LEDs RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1561EVKIT | 功能描述:LED 照明開(kāi)發(fā)工具 Evaluation Kit for MAX1561 RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| MAX1562ESA | 功能描述:電源開(kāi)關(guān) IC - USB 4A USB Crnt-Limited w/Autoreset RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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