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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： | 6/25页 |
| 文件大小： | 776K |
| 代理商： | TPS61140DRCT |
www.ti.com
APPLICATION INFORMATION
MAXIMUM OUTPUT CURRENT – PWM CONTROL
Ip +
1
L
1
Viout)Vf*Vin
)
1
Vin
Fs
(3)
Iout_max +
Vin
Ilim *
Ip
2
h
Viout
(4)
MAXIMUM OUTPUT CURRENT – PFM CONTROL
Ton +
L
I
lim
V
in
(5)
T
off +
L
I
lim
V
iout )
V * Vin
(6)
Iout_max +
h
I
lim
V
IN
2V
iout
Ton ) Toff
Ton ) Toff_min
(7)
SLVS624B – JANUARY 2006 – REVISED MARCH 2007
The over-current limit in a boost converter limits the maximum input current and thus maximum input power for a
given input voltage. Maximum output power is less than maximum input power due to power conversion losses.
Therefore, the current limit setting, input voltage, output voltage and efficiency can all change maximum current
output. Since current limit clamps peak inductor current, ripple has to be subtracted to derive maximum DC
current. The ripple current is a function of switching frequency, inductor value and duty cycle. The following
equations take into account of all the above factors for maximum output current calculation.
where
Ip = inductor peak to peak ripple
L = inductor value
Vf = power diode forward voltage
Fs = Switching frequency
Viout = boost output voltage. It is equal to the higher of either 330 mV + Vout or 330 mV + voltage drop
across WLED.
where
Iout_max = Maximum output current of the boost converter
Ilim = overcurrent limit
η = efficiency
To keep a tight range of the overcurrent limit, The TPS61140/1 uses the Vin and Iout pin voltage to compensate
for the overcurrent limit variation caused by the slope compensation. However, the current threshold still has
residual dependency on the Vin and Iout voltage. Use Figure 16 and Figure 17 to identify the typical overcurrent
limit in your application, and use
±25% tolerance to account for temperature dependency and process variations.
The maximum output current can also be limited by the current capability of the LDO and the current sink
circuitry. Both are designed to provide maximum 35 mA current regardless of the current capability of the boost
converter.
When only voltage output is selected, the boost operates in PFM mode, and the maximum output current can be
calculated as,
Toff_min = minimum off time
14
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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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