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參數(shù)資料
| 型號(hào)： | TPS61062YZF |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Male Bullet Solderless Terminal; Wire Size (AWG):16-14; Insulator Color:Blue; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No RoHS Compliant: No |
| 中文描述： | 恒定電流LED驅(qū)動(dòng)器，帶有數(shù)字和PWM亮度控制 |
| 文件頁(yè)數(shù)： | 12/22頁(yè) |
| 文件大?。?/td> | 609K |
| 代理商： | TPS61062YZF |
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APPLICATION INFORMATION
INDUCTOR SELECTION
The device requires typically a 22-μH or 10-μH inductance. When selecting the inductor, the inductor saturation
current should be rated as high as the peak inductor current at maximum load, and respectively, maximum LED
current. Because of the special control loop design, the inductor saturation current does not need to be rated for
the maximum switch current of the converter. The maximum converter switch current usually is not reached even
when the LED current is pulsed by applying a PWM signal to the enable pin. The maximum inductor peak
current, as well as LED current, is calculated as:
Duty Cycle : D
1
Vin
Vout
(1)
Maximum LED current : ILED
Isw
Vin
D
2
s
L
(1
D)
(2)
Inductor peak current : iLpeak
Vin
D
2
s
L
ILED
D)
(1
(3)
EFFICIENCY
The overall efficiency of the application depends on the specific application conditions and mainly on the
selection of the inductor. A physically smaller inductor usually shows lower efficiency due to higher switching
losses of the inductor (core losses, proximity losses, skin effect losses). A trade-off between physical inductor
size and overall efficiency has to be made. The efficiency can typically vary around
±
5% depending on the
selected inductor. Figures 2 to 7 can be used as a guideline for the application efficiency. These curves show the
typical efficiency with a 22 μH inductor (muRata LQH32CN220K23). Figure 23 shows a basic setup where the
efficiency is taken/measured as:
VLED
Vin
ILED
Iin
(4)
OUTPUT CAPACITOR SELECTION
The device is designed to operate with a fairly wide selection of ceramic output capacitors. The selection of the
output capacitor value is a trade-off between output voltage ripple and capacitor cost and form factor. In general,
capacitor values of 220 nF up to 4.7 μF can be used. When using a 220-nF output capacitor, it is recommended
TPS61060
TPS61061
TPS61062
SLVS538–NOVEMBER 2004
with:
fs = Switching frequency (1 MHz typ)
L = Inductor value
η
= Estimated converter efficiency (0.75)
Isw = Minimum N-channel MOSFET current limit (325 mA)
Using the expected converter efficiency is a simple approach to calculate maximum possible LED current as well
as peak inductor current. The efficiency can be estimated by taking the efficiency numbers out of the provided
efficiency curves or to use a worst-case assumption for the expected efficiency, e.g., 75%.
Table 2. Inductor Selection
INDUCTOR VALUE
10 μH
10 μH
10 μH
22 μH
22 μH
22 μH
COMPONENT SUPPLIER
TDK VLF3012AT-100MR49
Murata LQH32CN100K53
Murata LQH32CN100K23
TDK VLF3012AT-220MR33
Murata LQH32CN220K53
Murata LQH32CN220K23
DIMENSIONS
2,6 mm
×
2,8 mm
×
1,2 mm
3,2 mm
×
2,5 mm
×
1,55 mm
3,2 mm
×
2,5 mm
×
2,0 mm
2,6 mm
×
2,8 mm
×
1,2 mm
3,2 mm
×
2,5 mm
×
1,55 mm
3,2 mm
×
2,5 mm
×
2,0 mm
12
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參數(shù)描述 |
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| TPS61062YZFR | 功能描述:LED照明驅(qū)動(dòng)器 24V 400mA Switch 1MHz Boost Converter 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 |
| TPS61062YZFT | 功能描述:LED照明驅(qū)動(dòng)器 24V 400mA Switch 1MHz Boost Converter 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 |
| TPS61070 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
| TPS61070_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
| TPS61070DDC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
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