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參數(shù)資料
| 型號： | MAX1579ETG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Complete Bias and White LED Power Supplies for Small TFT Displays |
| 中文描述： | LED DISPLAY DRIVER, QCC24 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, MO-220WGGD-2, TQFN-24 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 221K |
| 代理商： | MAX1579ETG |
M
Complete Bias and White LED Power S upplies
for S mall T FT Displays
______________________________________________________________________________________
11
Component S elec tion
Use only ceramic capacitors with an X5R, X7R, or bet-
ter dielectric. See Table 1 for a list of recommended
components.
Capacitor Selection
Use low-ESR ceramic capacitors. Recommended val-
ues for the capacitors are shown in Table 1. To ensure
stability over a wide temperature range, ceramic
capacitors with an X5R or X7R dielectric are recom-
mended. Place these capacitors as close to the IC as
possible.
Inductor Selection
Recommended inductor values range from 10μH to
47μH. A 22μH inductor optimizes the efficiency for most
applications while maintaining low 15mV
P-P
input ripple.
With input voltages near 5V, a larger value of inductance
can be more efficient. To prevent core saturation, ensure
that the inductor-saturation current rating exceeds the
peak inductor current for the application. Calculate the
peak inductor current with the following formula:
Schottky Diode Selection
The MAX1578/MAX1579 require a high-speed rectifica-
tion diode (D1) for optimum performance. A Schottky
diode is recommended due to its fast recovery time
and low forward-voltage drop. Ensure that the diode’s
average and peak current ratings exceed the average
output current and the peak inductor current, respec-
tively. In addition, the diode’s reverse breakdown volt-
age must exceed V
OUT
. The RMS diode current is
calculated as:
PC Board Layout and Routing
Due to fast switching waveforms, careful PC board lay-
out is required. An evaluation kit (MAX1578EVKIT) is
available to speed design. When laying out a board,
minimize trace lengths between the IC and R1, the
inductor, the diode, the input capacitor, and the output
capacitor. Keep traces short, direct, and wide. Keep
noisy traces, such as the LX node trace, away from CS.
The IN bypass capacitor (C
IN
) should be placed as
close to the IC as possible. The transfer capacitors for
the charge pumps should be located as close as possi-
ble to the IC. PGND and GND should be connected
directly to the exposed paddle underneath the IC. The
ground connections of C
IN
and C
OUT
should be as
close together as possible. The traces from IN to the
inductor and from the Schottky diode to the LEDs may
be longer. The MAX1579 evaluation kit contains a sam-
ple layout to speed designs.
Chip Information
TRANSISTOR COUNT: 3801
PROCESS: BiCMOS
I
I
I
DIODE RMS
OUT
PEAK
(
)
=
×
I
V
I
V
V
s
L
PEAK
OUT MAX
(
0 8
LED MAX
(
IN MIN
(
IN MIN
(
=
×
×
+
×
×
)
)
)
)
.
.
0 8
2
μ
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| MAX1579ETG+ | 功能描述:LED照明驅(qū)動器 Cmplete Bias & White LED Power Supply 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 |
| MAX1579ETG+T | 功能描述:LED照明驅(qū)動器 Cmplete Bias & White LED Power Supply 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 |
| MAX1579ETG-T | 功能描述:LED照明驅(qū)動器 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 |
| MAX1579EVKIT | 功能描述:LED 照明開發(fā)工具 Evaluation Kit for the MAX1579 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: |
| MAX157ACPA | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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