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參數資料
| 型號： | TPS54519RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數： | 10/33頁 |
| 文件大小： | 1269K |
| 代理商： | TPS54519RTER |
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Optional
VIN= 3-6V
VOUT= 1.8V, 5A
1
C4
R3
23.7k
R2
11.5k
R1
14.3k
R4
35.7k
R5
100k
C7
0.1uF
R6
20k
C5
1000pF
R7
10.0k
C1
10uF
C2
0.1uF
C8
47uF
C6
0.01uF
1
VIN
2
VIN
3
GND
4
GND
5
AGND
6
VSNS
7
COMP
8
RT/CLK
9
SS/TR
10
PH
11
PH
12
PH
13
BOOT
14
PWRGD
15
EN
16
VIN
17
PWRPD
U1
TPS54519
C10
220pF
C9
47uF
1
2
L1
1.2 uH
C3
220pF
VSNS
VIN
VOUT
VIN
SLVSAT3
– SEPTEMBER 2011
APPLICATION INFORMATION
DESIGN GUIDE
– STEP-BY-STEP DESIGN PROCEDURE
This example details the design of a high frequency switching regulator design using ceramic output capacitors.
This design is available as the PWR037-002 evaluation module (EVM). A few parameters must be known in
order to start the design process. These parameters are typically determined on the system level. For this
example, we start with the following known parameters:
Output Voltage
1.8 V
Transient Response 1.25 to 3.75 A load step
ΔVout = 4%
Maximum Output Current
5 A
Input Voltage
3 V - 6 V
Output Voltage Ripple
< 30 mV p-p
Start Input Voltage (rising VIN)
2.9 V
Stop Input Voltage (falling VIN)
2.66 V
Switching Frequency (Fsw)
1000 kHz
SELECTING THE SWITCHING FREQUENCY
The first step is to decide on a switching frequency for the regulator. Typically, you want to choose the highest
switching frequency possible since this produces the smallest solution size. The high switching frequency allows
for lower valued inductors and smaller output capacitors compared to a power supply that switches at a lower
frequency. However, the highest switching frequency causes extra switching losses, which hurt the converter
’s
performance. The converter is capable of running from 200 kHz to 2 MHz. Unless a small solution size is an
ultimate goal, a moderate switching frequency of 1MHz is selected to achieve both a small solution size and a
high efficiency operation. Using Equation 9, R4 is calculated to be 35.4 k
. A standard 1% 35.7 k value was
chosen in the design.
Figure 27. High Frequency, 1.8 V Output Power Supply Design with Adjusted UVLO
OUTPUT INDUCTOR SELECTION
The inductor selected works for the entire TPS54519 input voltage range. To calculate the value of the output
inductor, use Equation 22. KIND is a coefficient that represents the amount of inductor ripple current relative to the
maximum output current. The inductor ripple current is filtered by the output capacitor. Therefore, choosing high
inductor ripple currents impacts the selection of the output capacitor since the output capacitor must have a
ripple current rating equal to or greater than the inductor ripple current. In general, the inductor ripple value is at
the discretion of the designer; however, KIND is normally from 0.1 to 0.3 for the majority of applications.
For this design example, use KIND = 0.3 and the minimum inductor value is calculated to be 0.84 μH. For this
design, a larger standard value was chosen: 1.2
μH. For the output filter inductor, it is important that the RMS
current and saturation current ratings not be exceeded. The RMS and peak inductor current can be found from
18
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54519
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54519RTET | 功能描述:直流/直流開關調節器 2.95-6VIN,5A SYNC STEP-DOWN CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54521 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521EVM-607 | 功能描述:電源管理IC開發工具 TPS54521 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54521RHL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
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