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参数资料
| 型号： | TPS5410MDREP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4.6 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, SOIC-8 |
| 文件页数： | 4/25页 |
| 文件大小： | 759K |
| 代理商： | TPS5410MDREP |
LMIN =
()
VOUT
IN(MAX)
OUT
xV
-V
VIN(max)
IND
OUT
SW
xK
xI
xF
x0.8
I
L(RMS) +
I2
OUT(MAX) )
1
12
V
OUT
V
IN(MAX) *
V
OUT
V
IN(MAX)
L
OUT
F
SW
0.8
2
IL(PK) =I
+
OUT(MAX)
()
V
OUT
IN(MAX)
OUT
x
-
1.6 xV
xL
xF
IN(MAX)
OUT
SW
SLVS910 – SEPTEMBER 2009 ......................................................................................................................................................................................... www.ti.com
The maximum ratings for voltage and current are not to be exceeded under any
circumstance.
Additionally, some bulk capacitance may be needed, especially if the TPS5410 circuit is not located within
approximately 2 inches from the input voltage source. The value for this capacitor is not critical but it should be
rated to handle the maximum input voltage including ripple voltage and should filter the output so that input ripple
voltage is acceptable.
Output Filter Components
Two components need to be selected for the output filter, L1 and C3. Since the TPS5410 is an internally
compensated device, a limited range of filter component types and values can be supported.
Inductor Selection
To calculate the minimum value of the output inductor, use Equation 4:
(4)
KIND is a coefficient that represents the amount of inductor ripple current relative to the maximum output current.
Three things need to be considered when determining the amount of ripple current in the inductor: the peak to
peak ripple current affects the output ripple voltage amplitude, the ripple current affects the peak switch current,
and the amount of ripple current determines at what point the circuit becomes discontinuous. For designs using
the TPS5410, KIND of 0.2 to 0.3 yields good results. Low output ripple voltages is obtained when paired with the
proper output capacitor, the peak switch current is below the current limit set point, and low load currents can be
sourced before discontinuous operation.
For this design example, use KIND = 0.3, and the minimum inductor value is 66 μH. The next highest standard
value used in this design is 68
μH.
For the output filter inductor, it is important that the RMS current and saturation current ratings not be exceeded.
The RMS inductor current can be found from Equation 5:
(5)
and the peak inductor current can be determined using Equation 6:
(6)
For this design, the RMS inductor current is 1.004 A, and the peak inductor current is 1.147 A. The chosen
inductor is a Coilcraft MSS1260-683 type. The nominal inductance is 68
μH. It has a saturation current rating of
2.3 A and a RMS current rating of 2.3 A, which meets the requirements. Inductor values for use with the
TPS5410 are in the range of 10
μH to 100 μH.
Capacitor Selection
The important design factors for the output capacitor are dc voltage rating, ripple current rating, and equivalent
series resistance (ESR). The dc voltage and ripple current ratings cannot be exceeded. The ESR is important
because along with the inductor ripple current it determines the amount of output ripple voltage. The actual value
of the output capacitor is not critical, but some practical limits do exist. Consider the relationship between the
desired closed loop crossover frequency of the design and LC corner frequency of the output filter. Due to the
design of the internal compensation, it is recommended to keep the closed loop crossover frequency in the range
3 kHz to 30 kHz as this frequency range has adequate phase boost to allow for stable operation. For this design
example, the intended closed loop crossover frequency is between 2590 Hz and 24 kHz, and below the ESR
zero of the output capacitor. Under these conditions, the closed loop crossover frequency is related to the LC
corner frequency as:
12
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS5410-EP
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相关代理商/技术参数 |
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| TPS5410-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1-A, WIDE INPUT RANGE, STEP-DOWN SWIFTa?￠ CONVERTER |
| TPS5410QDRQ1 | 功能描述:直流/直流开关调节器 AC 5.5-36V,1A,500kHz 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 |
| TPS54110 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SWIFT Converter Product Portfolio |
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| TPS54110EVM-044 | 制造商:Texas Instruments 功能描述:EVAL BOARD, TPS54110 ADJ 1.5A STEP-DOWN |
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