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参数资料
| 型号： | TPS61060DRB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 显示驱动器 |
| 英文描述： | LED DISPLAY DRIVER, PDSO8 |
| 封装： | 3 X 3 MM, PLASTIC, SON-8 |
| 文件页数： | 4/25页 |
| 文件大小： | 761K |
| 代理商： | TPS61060DRB |
www.ti.com
APPLICATION INFORMATION
INDUCTOR SELECTION
Duty Cycle : D + 1 *
Vin
Vout
(1)
Maximum LED current : I
LED +
Isw *
Vin
D
2
s
L
(1 * D)
h
(2)
Inductor peak current : i
Lpeak +
Vin
D
2
s
L
)
I
LED
(1 * D)
h
(3)
EFFICIENCY
h
+
V
LED
I
LED
V
in
I
in
(5)
OUTPUT CAPACITOR SELECTION
TPS61060
TPS61061
TPS61062
SLVS538A – NOVEMBER 2004 – REVISED APRIL 2005
The device requires typically a 22-H or 10-H 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:
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%.
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-H inductor (Murata Electronics LQH32CN220K23). Figure 23 shows a basic setup
where the efficiency is taken/measured as:
Table 2. Inductor Selection
INDUCTOR VALUE
COMPONENT SUPPLIER
DIMENSIONS
10 H
TDK VLF3012AT-100MR49
2,6 mm × 2,8 mm × 1,2 mm
10 H
Murata LQH32CN100K53
3,2 mm × 2,5 mm × 1,55 mm
10 H
Murata LQH32CN100K23
3,2 mm × 2,5 mm × 2,0 mm
22 H
TDK VLF3012AT-220MR33
2,6 mm × 2,8 mm × 1,2 mm
22 H
Murata LQH32CN220K53
3,2 mm × 2,5 mm × 1,55 mm
22 H
Murata LQH32CN220K23
3,2 mm × 2,5 mm × 2,0 mm
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 F can be used. When using a 220-nF output capacitor, it is recommended
12
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| TPS61060DRBR | 功能描述:LED照明驱动器 15V 400mA Switch 1MHz Boost Converter RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS61060DRBRG4 | 功能描述:LED照明驱动器 15V 400mA Switch 1MHz Boost Converter RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS61060YZF | 制造商:TI 制造商全称:Texas Instruments 功能描述:CONSTANT CURRENT LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL |
| TPS61060YZFR | 功能描述:LED照明驱动器 15V 400mA Switch 1MHz Boost Converter RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS61060YZFT | 功能描述:LED照明驱动器 15V 400mA Switch 1MHz Boost Converter RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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