- 您現在的位置：買賣IC網 > PDF目錄98282 > TPS53851RHHT (TEXAS INSTRUMENTS INC) SWITCHING CONTROLLER, PQCC36 PDF資料下載
參數資料
| 型號： | TPS53851RHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC36 |
| 封裝： | PLASTIC, VQFN-36 |
| 文件頁數： | 46/66頁 |
| 文件大小： | 1264K |
| 代理商： | TPS53851RHHT |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁當前第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁
PH
N
PH
i=1
OUT
PH
N
-1
PH
i=1
i - N
× D
I
(N , D) =
( i - N
× D + 1)
I
RIPPLE +
V
OUT
L
f
SW
DIOUT NPH, D + 4.374 A
SLUS985 – DECEMBER 2009
www.ti.com
6.2
Example 2: Two-Phase Single Output Configuration From 12 V to 1.5 V DC/DC
Converter Using a TPS53851
The following example illustrates the design process and component selection for a two-phase single
output synchronous buck converter using TPS53851. The design goal parameters are given in Table 6-2.
The inductor and MOSFET selection equations are quite similar to the dual output converter design, so
they are not repeated here.
Table 6-2. Design Goal Parameters
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
VIN
Input Voltage
10.8
12
13.2
V
VOUT
Output voltage
1.5
V
VRIPPLE
Output ripple
IO = 32A
2%Vo
V
IOUT1
Output current
32
A
fsw
Switching frequency
500
kHz
6.2.1
Step 1: Output Capacitor Selection
The output capacitor is typically selected by the output load transient response requirement. Equation 22
in the dual output design example is used. The inductor L in the equation is equal to the phase inductance
divided by number of phases.
Based on a 15-A load transient with a maximum of 30 mV deviation, a minimum 1.32-
μF output capacitor
is required. In the design, four 330-
μF, 2 V, SP capacitor are selected to meet this requirement. Each
capacitor has an ESR of 6 m
.
Another criterion for capacitor selection is the output ripple voltage that is determined mainly by the
capacitance and the ESR.
Due to the interleaving of channels, the total output ripple current is smaller than the ripple current from a
single phase. The ripple cancellation factor is expressed in Equation 56.
(56)
Where:
D is the duty cycle for a single phase
NPH is the number of active phases, here it is equal to 2
Then the maximum output ripple current is calculated by:
(57)
With 1.32 mF output capacitance, the ripple voltage at the capacitor is calculated to be 828
μV. In the
specification, the output ripple voltage should be less than 30mV, so based on Equation 23, the required
maximum ESR is 6.7 m
. The selected capacitors can meet this requirement.
6.2.2
Step 2: Input Capacitor Selection
The input voltage ripple depends on the input capacitance and the ESR. The minimum capacitor and the
maximum ESR can be estimated by Equation 24 and Equation 25 in the dual output design example.
50
DESIGN EXAMPLES
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
相關PDF資料 |
PDF描述 |
|---|---|
| TPS54010PWPG4 | 25 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54040DGQ | 0.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS54073PWPRG4 | 25 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54073PWPR | 25 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54073PWP | 25 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS53915EVM-587 | 功能描述:TPS53915 SWIFT?, D-CAP3?, Eco-Mode? DC/DC, Step Down 1, Non-Isolated Outputs Evaluation Board 制造商:texas instruments 系列:SWIFT?，D-CAP3?，Eco-Mode? 零件狀態:有效 主要用途:DC/DC，步降 輸出和類型:1，非隔離 功率 - 輸出:- 電壓 - 輸出:1.2V 電流 - 輸出:12A 電壓 - 輸入:12V 穩壓器拓撲:降壓 頻率 - 開關:- 板類型:完全填充 所含物品:板 使用的 IC/零件:TPS53915 標準包裝:1 |
| TPS53915RVET | 制造商:Texas Instruments 功能描述:1.5V TO 18V INPUT (4.5V TO 25V BIAS), 12-A SYNCHRONOUS STEP- - Tape and Reel 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 12A 28VQFN |
| TPS5401 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:0.5-A, 42-V Input, Step-Down SWIFT? Converter |
| TPS54010 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SWIFT Converter Product Portfolio |
| TPS54010EVM-067 | 功能描述:電源管理IC開發工具 4.0 Vin DC/DC Conv 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 |
發布緊急采購，3分鐘左右您將得到回復。