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参数资料
| 型号： | TPS61240YFFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, 3500 kHz SWITCHING FREQ-MAX, BGA6 |
| 封装： | 0.40 MM PITCH, GREEN, DSBGA-6 |
| 文件页数： | 6/26页 |
| 文件大小： | 755K |
| 代理商： | TPS61240YFFR |
OUT
L_MAX
OUT
IN
V
I
η
V
(
)
-
D
IN
OUT
IN
MIN
L
OUT
V
L
I
f
V
OUT
IN
L(peak)
OUT
I
V
D
I
=
+
with D =
2
f
L
(1
D)
η
V
-
-
SLVS806A – APRIL 2009 – REVISED MAY 2009
www.ti.com
DESIGN PROCEDURE
PROGRAMMING THE OUTPUT VOLTAGE
The output voltage is set by a resistor divider internally. The FB pin is used to sense the output voltage. To
configure the output properly, the FB pin needs to be connected directly as shown in Figure 18 and Figure 19.
INDUCTOR SELECTION
To make sure that the TPS6124x devices can operate, an inductor must be connected between pin VIN and pin
L. A boost converter normally requires two main passive components for storing energy during the conversion. A
boost inductor and a storage capacitor at the output are required. To select the boost inductor, it is
recommended to keep the possible peak inductor current below the current limit threshold of the power switch in
the chosen configuration. The highest peak current through the inductor and the switch depends on the output
load, the input (VIN), and the output voltage (VOU T). Estimation of the maximum average inductor current can be
done using Equation 2.
(2)
For example, for an output current of 200mA at 5.0V VOUT, at least 540mA of average current flows through the
inductor at a minimum input voltage of 2.3V.
The second parameter for choosing the inductor is the desired current ripple in the inductor. Normally, it is
advisable to work with a ripple of less than 20% of the average inductor current. A smaller ripple reduces the
magnetic hysteresis losses in the inductor, as well as output voltage ripple and EMI. But in the same way,
regulation time at load changes rises. In addition, a larger inductor increases the total system size and cost. With
these parameters, it is possible to calculate the value of the minimum inductance by using Equation 3.
(3)
Parameter f is the switching frequency and
ΔIL is the ripple current in the inductor, i.e., 20% x IL. In this example,
the desired inductor has the value of 1.7 mH. With this calculated value and the calculated currents, it is possible
to choose a suitable inductor. In typical applications a 1.0 mH inductance is recommended. The device has been
optimized to operate with inductance values between 1.0 mH and 2.2 mH. It is recommended that inductance
values of at least 1.0 mH is used, even if Equation 3 yields something lower. Care has to be taken that load
transients and losses in the circuit can lead to higher currents as estimated in Equation 3. Also, the losses in the
inductor caused by magnetic hysteresis losses and copper losses are a major parameter for total circuit
efficiency.,
With the chosen inductance value, the peak current for the inductor in steady state operation can be calculated.
Equation 4 shows how to calculate the peak current I.
(4)
This would be the critical value for the current rating for selecting the inductor. It also needs to be taken into
account that load transients and error conditions may cause higher inductor currents.
Table 2. Table 1. List of Inductors
Manufacturer
Series
Dimensions
TOKO
MDT2012-CH1R0AN
2.0 x 1.2 x 1.0 max. height
KSLI-201210AG-1R0
2.0 x 1.2 x 1.0 max. height
Hitachi Metals
KSLI-201610AG-1R0
2.0 x 1.6 x 1.0 max. height
Murata
LQM21PN1R0MC0
2.0 x 1.2 x 0.55 max. height
FDK
MIPS2012D1R0-X2
2.0 x 1.2 x 1.0 max. height
14
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS61240, TPS61241
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相关代理商/技术参数 |
参数描述 |
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| TPS61240YFFT | 功能描述:直流/直流开关调节器 5V, 400mA, 4MHz Step Up DC/DC Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS61240YFFT | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
| TPS61241 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.5-MHz High Efficiency Step-Up Converter |
| TPS61241YFF | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.5-MHz High Efficiency Step-Up Converter |
| TPS61241YFFR | 功能描述:直流/直流开关调节器 5V 500mA 4MHz Step- Up DC/DC Cnvrtr RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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