- 您现在的位置：买卖IC网 > PDF目录98282 > TPS54233DG4 (TEXAS INSTRUMENTS INC) 2 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PDSO8 PDF资料下载
参数资料
| 型号： | TPS54233DG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 4/25页 |
| 文件大小： | 789K |
| 代理商： | TPS54233DG4 |
(
)
OUT(MAX)
IN
OUT(MAX)
MAX
BULK
SW
I
0.25
V
=
+
I
ESR
C
f
D
2
OUT(MAX)
CIN
I
=
(
)
OUT(MAX)
IN(MAX)
OUT
MIN
IN(MAX)
IND
OUT
SW
V
L
=
V
K
I
F
-
(
)
2
OUT
IN(MAX)
OUT
2
L(RMS)
OUT(MAX)
IN(MAX)
OUT
SW
V
1
I
=
I
+
12
V
L
F
0.7
-
÷
÷
è
(
)
OUT
IN(MAX)
OUT
L(PK)
OUT(MAX)
IN(MAX)
OUT
SW
V
I
= I
+
1.4
V
L
F
-
SLUS859B
– OCTOBER 2008 – REVISED FEBRUARY 2011
This input ripple voltage can be approximated by Equation 6
(6)
Where IOUT(MAX) is the maximum load current, fSW is the switching frequency, CBULK is the bulk capacitor value
and ESRMAX is the maximum series resistance of the bulk capacitor.
The maximum RMS ripple current also needs to be checked. For worst case conditions, this can be
approximated by Equation 7
(7)
In this case, the input ripple voltage would be 143 mV and the RMS ripple current would be 1.5 A. It is also
important to note that the actual input voltage ripple will be greatly affected by parasitics associated with the
layout and the output impedance of the voltage source. The actual input voltage ripple for this circuit is shown in
Design Parameters and is larger than the calculated value. This measured value is still below the specified input
limit of 300 mV. The maximum voltage across the input capacitors would be VIN max plus
ΔVIN/2. The chosen
bulk and bypass capacitors are each rated for 50 V and the ripple current capacity is greater than 3 A, both
providing ample margin. It is important that the maximum ratings for voltage and current are not exceeded under
any circumstance.
OUTPUT FILTER COMPONENTS
Two components need to be selected for the output filter, L1 and C2. Since the TPS54233 is an externally
compensated device, a wide range of filter component types and values can be supported.
Inductor Selection
To calculate the minimum value of the output inductor, use Equation 8
(8)
KIND is a coefficient that represents the amount of inductor ripple current relative to the maximum output current.
This value is at the discretion of the designer; however, the following guidelines may be used. For designs using
low ESR output capacitors such as ceramics, a value as high as KIND = 0.3 may be used. When using higher
ESR output capacitors, KIND = 0.2 yields better results.
For this design example, use KIND = 0.3 and the minimum inductor value is calculated to be 14.97μH. For this
design, the closest value 15
μH was chosen.
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 9
(9)
and the peak inductor current can be determined with Equation 10
(10)
For this design, the RMS inductor current is 2.02 A and the peak inductor current is 2.43 A. The chosen inductor
is a Coilcraft MSS1038-153ML 15
μH. It has a saturation current rating of 3.86 A and an RMS current rating of
3.8 A, meeting these requirements. Smaller or larger inductor values can be used depending on the amount of
ripple current the designer wishes to allow so long as the other design requirements are met. Larger value
inductors will have lower ac current and result in lower output voltage ripple, while smaller inductor values will
increase ac current and output voltage ripple. Inductor values for use with the TPS54233 are in the range of
6.8
μH to 47 μH.
12
2008–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54233
相关PDF资料 |
PDF描述 |
|---|---|
| TPS54240QDGQRQ1 | 2.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS54260DGQR | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS54260QDGQRQ1 | 2.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS5430MDDAREPG4 | 8.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS54310MPWPREP | 6 A SWITCHING REGULATOR, 775 kHz SWITCHING FREQ-MAX, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS54233DR | 功能描述:直流/直流开关转换器 28V,2A,300khZ Non- synch Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54233DRG4 | 功能描述:直流/直流开关转换器 28V,2A,300khZ Non- Synch Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54233EVM-373 | 功能描述:电源管理IC开发工具 TPS54233EVM-373 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 |
| TPS54233-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-A, 28-V INPUT, STEP-DOWN DC/DC CONVERTER WITH ECO-MODEa?￠ |
| TPS54233QDRQ1 | 功能描述:开关变换器、稳压器与控制器 AC 3.5-28Vin,2A 300kHz SD Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。