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參數資料
| 型號： | TPS61070DDC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 90% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
| 中文描述： | 90％高效同步升壓轉換器和600毫安開關 |
| 文件頁數： | 16/21頁 |
| 文件大小： | 633K |
| 代理商： | TPS61070DDC |
www.ti.com
L
VBAT
(VOUT
VBAT)
IL
VOUT
(4)
Capacitor Selection
Input Capacitor
Output Capacitor
Cmin
IO
VOUT
V
VBAT
VOUT
(5)
TPS61070
TPS61071
SLVS510–JUNE 2004
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 rises at load changes. In addition, a larger inductor increases the total system costs. With these
parameters, it is possible to calculate the value for the inductor by using Equation 4:
Parameter
f
is the switching frequency and
I
L
is the ripple current in the inductor, i.e., 40%
×
I
L
. In this example,
the desired inductor has the value of 4 μH. With this calculated value and the calculated currents, it is possible to
choose a suitable inductor. In typical applications, a 4.7-μH inductance is recommended. The device has been
optimized to operate with inductance values between 2.2 μH and 10 μH. Nevertheless, operation with higher
inductance values may be possible in some applications. Detailed stability analysis is then recommended. Care
must be taken because load transients and losses in the circuit can lead to higher currents as estimated in
Equation 4. Also, the losses in the inductor caused by magnetic hysteresis losses and copper losses are a major
parameter for total circuit efficiency.
The following inductor series from different suppliers have been used with the TPS6107x converters:
Table 1. List of Inductors
VENDOR
INDUCTOR SERIES
VLF3010
VLF4012
744031xxx
744042xxx
B82462-G4
SD18
SD20
CB2016B xxx
CB2518B xxx
TDK
Wurth Elektronik
EPCOS
Cooper Electronics Technologies
Taiyo Yuden
At least a 10-μF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior
of the total power supply circuit. A ceramic capacitor or a tantalum capacitor with a 100-nF ceramic capacitor in
parallel, placed close to the IC, is recommended.
The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of
the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is
possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero, by
using Equation 5:
Parameter
f
is the switching frequency and
V is the maximum allowed ripple.
With a chosen ripple voltage of 10 mV, a minimum capacitance of 4.5 μF is needed. In this value range, ceramic
capacitors are a good choice. The ESR and the additional ripple created are negligible. It is calculated using
Equation 6:
16
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| TPS61070DDCR | 功能描述:直流/直流開關調節器 Adj 600-mA Switch PFM/PWM Boost Con 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 |
| TPS61070DDCRG4 | 功能描述:直流/直流開關調節器 Adj 600-mA Switch PFM/PWM Boost Con 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 |
| TPS61070EVM-062 | 功能描述:電源管理IC開發工具 TPS61070-062 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 |
| TPS61070EVM-62 | 功能描述:EVALUATION MODULE FOR TPS61070 RoHS:是 類別:編程器，開發系統 >> 過時/停產零件編號 系列:- 標準包裝:1 系列:* |
| TPS61070TDDCRQ1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:90PER EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 600-mA SWITCH |
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