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| 型号： | TPS40210QDGQRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLATSIC, MSOP-10 |
| 文件页数： | 4/41页 |
| 文件大小： | 999K |
| 代理商： | TPS40210QDGQRQ1 |
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D
IN
V
1
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f
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SW
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L
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SLVS861D – AUGUST 2008 – REVISED APRIL 2010
www.ti.com
APPLICATION INFORMATION
Minimum On-Time and Off-Time Considerations
The TPS40210 has a minimum off time of approximately 200 ns and a minimum on time of 300 ns. These two
constraints place limitations on the operating frequency that can be used for a given input-to-output conversion
ratio. See Figure 2 for the maximum frequency that can be used for a given duty cycle.
The duty cycle at which the converter operates is dependent on the mode in which the converter is running. If the
converter is running in discontinuous conduction mode, the duty cycle varies with changes to the load much
more than it does when running in continuous conduction mode.
In continuous conduction mode, the duty cycle is related primarily to the input and output voltages.
(1)
(2)
In discontinuous mode, the duty cycle is a function of the load, input and output voltages, inductance, and
switching frequency.
(3)
All converters using a diode as the freewheeling or catch component have a load current level at which they
transition from discontinuous conduction to continuous conduction. This is the point at which the inductor current
falls to zero. At higher load currents, the inductor current does not fall to zero but remains flowing in a positive
direction and assumes a trapezoidal wave shape as opposed to a triangular wave shape. This load boundary
between discontinuous conduction and continuous conduction can be found for a set of converter parameters as
shown in Equation 4.
(4)
For loads higher than the result of Equation 4, the duty cycle is given by Equation 2, and for loads less than the
results of Equation 4, the duty cycle is given Equation 3. For Equation 1 through Equation 4, the variable
definitions are as follows:
VOUT is the output voltage of the converter in V
VD is the forward conduction voltage drop across the rectifier or catch diode in V
VIN is the input voltage to the converter in V
IOUT is the output current of the converter in A
L is the inductor value in H
f SW is the switching frequency in Hz
12
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40210-Q1 TPS40211-Q1
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| TPS40210SHKK | 功能描述:电流型 PWM 控制器 Wide Inp Range Crnt Mode Boost Contrlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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| TPS40211DGQ | 功能描述:LED照明驱动器 Wide Input Rnge Crnt Mode Boost Cntrlr 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 |
| TPS40211DGQ | 制造商:Texas Instruments 功能描述:DC/DC Controllers (External Switch) IC 制造商:Texas Instruments 功能描述:IC, BOOST CONTROLLER, MSOP-10 |
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