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參數(shù)資料
| 型號(hào)： | MAX16814AUP+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller; Package: TSSOP-EP;20 pin;43 mm² ; Temperature: -40°C to +125°C |
| 中文描述： | LED DISPLAY DRIVER, PDSO20 |
| 封裝： | 6.50 X 4.40 MM, ROHS COMPLIANT, TSSOP-20 |
| 文件頁數(shù)： | 8/25頁 |
| 文件大小： | 1800K |
| 代理商： | MAX16814AUP+ |
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
MAX16814
16 _____________________________________________________________________________________
Power-Circuit Design
First select a converter topology based on the above
factors. Determine the required input supply voltage
range, the maximum voltage needed to drive the LED
strings including the minimum 1V across the constant
LED current sink (VLED), and the total output current
needed to drive the LED strings (ILED) as follows:
LED
STRING
I
N
=
×
where ISTRING is the LED current per string in amperes
and NSTRING is the number of strings used.
Calculate the maximum duty cycle (DMAX) using the fol-
lowing equations:
For boost configuration:
LED
D1
IN_MIN
MAX
LED
D1
DS
(V
V
)
D
(V
V
0.3V)
+
=
+
For SEPIC and coupled-inductor boost-buck-configura-
tions:
LED
D1
MAX
IN_MIN
DS
LED
D1
(V
V )
D
(V
V
0.3V V
V )
+
=
+
where VD1 is the forward drop of the rectifier diode in
volts (approximately 0.6V), VIN_MIN is the minimum input
supply voltage in volts, and VDS is the drain-to-source
voltage of the external MOSFET in volts when it is on,
and 0.3V is the peak current-sense voltage. Initially, use
an approximate value of 0.2V for VDS to calculate DMAX.
Calculate a more accurate value of DMAX after the power
MOSFET is selected based on the maximum inductor
current. Select the switching frequency (fSW) depending
on the space, noise, and efficiency constraints.
Inductor Selection
Boost and Coupled-Inductor
Boost-Buck Configurations
In all the three converter configurations, the average
inductor current varies with the line voltage and the
maximum average current occurs at the lowest line
voltage. For the boost converter, the average inductor
current is equal to the input current. Select the maximum
peak-to-peak ripple on the inductor current (DIL). The
recommended peak-to-peak ripple is 60% of the aver-
age inductor current.
Use the following equations to calculate the maximum
average inductor current (ILAVG) and peak inductor cur-
rent (ILP) in amperes:
LED
AVG
MAX
I
IL
1 D
=
Allowing the peak-to-peak inductor ripple DIL to be
+30% of the average inductor current:
AVG
IL IL
0.3 2
=
×
and:
P
AVG
IL
2
=
+
Calculate the minimum inductance value, LMIN, in hen-
ries with the inductor current ripple set to the maximum
value:
MIN
DS
MAX
MIN
SW
(VIN
V
0.3V) D
L
f
IL
×
=
×
where 0.3V is the peak current-sense voltage. Choose
an inductor that has a minimum inductance greater
than the calculated LMIN and current rating greater than
ILP. The recommended saturation current limit of the
selected inductor is 10% higher than the inductor peak
current for boost configuration. For the coupled-inductor
boost-buck, the saturation limit of the inductor with only
one winding conducting should be 10% higher than ILP.
SEPIC Configuration
Power circuit design for the SEPIC configuration is very
similar to a conventional boost-buck design with the
output voltage referenced to the input supply voltage.
For SEPIC, the output is referenced to ground and the
inductor is split into two parts (see Figure 5 for the SEPIC
configuration). One of the inductors (L2) takes LED cur-
rent as the average current and the other (L1) takes
input current as the average current.
Use the following equations to calculate the average
inductor currents (IL1AVG, IL2AVG) and peak inductor
currents (IL1P, IL2P) in amperes:
LED
MAX
AVG
MAX
I
D
1.1
IL1
1 D
×
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX16814AUP/V+ | 制造商:Maxim Integrated Products 功能描述:INTEGRATED 4-CHANNEL HIGH-BRIGHTNESS LED DRIVER WITH HIGH-VO - Rail/Tube |
| MAX16814AUP/V+T | 制造商:Maxim Integrated Products 功能描述:INTEGRATED 4-CHANNEL HIGH-BRIGHTNESS LED DRIVER WITH HIGH-VO - Tape and Reel |
| MAX16814AUP+ | 功能描述:LED照明驅(qū)動(dòng)器 4Ch HB Drvr w/High-V DC/DC Controller 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 |
| MAX16814AUP+T | 功能描述:LED照明驅(qū)動(dòng)器 4Ch HB Drvr w/High-V DC/DC Controller 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 |
| MAX16814BEUP+ | 功能描述:LED照明驅(qū)動(dòng)器 4Ch HB Drvr w/High-V DC/DC Controller 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 |
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