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参数资料
| 型号： | TPS61140DRCT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.26 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-10 |
| 文件页数： | 9/25页 |
| 文件大小： | 776K |
| 代理商： | TPS61140DRCT |
www.ti.com
INPUT AND OUTPUT CAPACITOR SELECTION
Cout +
V
iout *
V
in
Iout
V
iout
Fs
V
ripple
(12)
SLVS624B – JANUARY 2006 – REVISED MARCH 2007
Table 2. Recommended Inductors for Single Output
L
DCR Typ
Isat
SIZE
(
H)
(m
)
(A)
(L
×W×H mm)
TDK
VLF3012AT-100MR49
10
360
0.49
2.8
×3.0×1.2
VLCF4018T-100MR74-2
10
163
0.74
4.0
×4.0×1.8
Sumida
CDRH2D11/HP
10
447
0.52
3.2
×3.2×1.2
CDRH3D16/HP
10
230
0.84
4.0
×4.0×1.8
Table 3. Recommended Inductors for Both-On Mode
L
DCR Typ
Isat
SIZE
(
H)
(m
)
(A)
(L
×W×H mm)
TDK
VLCF4018T-100MR74-2
10
163
0.74
4X4.0X1.8
VLF4012AT-100MR79
10
300
0.85
3.5X3.7X1.2
Sumida
CDRH3D16/HP
10
230
0.84
4X4.0X1.8
CDRH4D11/HP
10
340
0.85
4.8X4.8X1.2
The output capacitor is mainly selected to minimize the output ripple from the converter. This ripple voltage is
the sum of the ripple caused by the capacitor’s capacitance and its equivalent series resistance (ESR).
Assuming fixed frequency PWM operation and a capacitor with zero ESR, the minimum capacitance needed for
a given ripple can be calculated by
Vripple = Peak-to-peak output ripple.
For VI = 3.6 V, VO = 20 V, and Fs = 1.2 MHz, 0.1% ripple (20 mV) would require 4.7-F capacitor. For this value,
ceramic capacitors are the best choice for its size, cost and availability.
The additional output ripple component caused by ESR is calculated using:
V(ripple_ESR) = Iout× R(ESR)
V(ripple_ESR) can be neglected for ceramic capacitors due to their low ESR, but must be considered if tantalum or
electrolytic capacitors are used.
During a load transient, the capacitor at the output of the boost converter has to supply or absorb additional
current before the inductor current ramps up the steady state value. Larger capacitors always help to reduce the
voltage over and under shoot during a load transient. A larger capacitor also helps improve loop stability. When
the OLED output is enabled, a load transient disturbs the output of the boost converter when the WLED output is
enabled or disabled. Although the LDOs PSRR (power supply rejection ratio) reduces the disturbance
propagated to the VO, additional capacitance may be needed if a high precision OLED voltage is required. For
its stability, the LDO requires a minimum output capacitance (C3 in the block diagram) of 1
F. Additional
capacitance improves the LDO’s PSRR for low frequency noises.
Care must be taken when evaluating a ceramic capacitors derating due to applied dc voltage, aging and over
frequency. For example, larger form factor capacitors (in 1206 size) have their self resonant frequencies in the
range of the TPS61140/1’s switching frequency. So the effective capacitance is significantly lower. Therefore, it
may be necessary to use small capacitors in parallel instead of one large capacitor.
The popular vendors for high value ceramic capacitors are:
17
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相关代理商/技术参数 |
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|---|---|
| TPS61140DRCT | 制造商:Texas Instruments 功能描述:IC LED DRVR WT/OLED BCKLT 10-SON 制造商:Texas Instruments 功能描述:IC, LED DRVR WT/OLED BCKLT 10-SON |
| TPS61140DRCTG4 | 功能描述:LED照明驱动器 Dual 700mA Switch 1.2MHz Boost Cnvrtr 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 |
| TPS61140EVM-157 | 功能描述:电源管理IC开发工具 TPS61140-157 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS61141 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL OUTPUT BOOST REGULATOR USING SINGLE INDUCTOR |
| TPS61141DRCR | 功能描述:LED照明驱动器 Dual 700mA Switch 1.2MHz Boost Cnvrtr 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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