- 您现在的位置：买卖IC网 > PDF目录98285 > TPS65171RHAR (TEXAS INSTRUMENTS INC) 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 PDF资料下载
参数资料
| 型号： | TPS65171RHAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件页数： | 15/46页 |
| 文件大小： | 3644K |
| 代理商： | TPS65171RHAR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
www.ti.com
Inductor Selection (Boost Converter)
The boost converter is able to operate with 6.8mH to 15mH inductors, a 10mH inductor is typical. The main
parameter for inductor selection is the saturation current of the inductor, which should be higher than the peak
switch current as calculated in the Design Procedure section with additional margin to cover for heavy load
transients. The alternative more conservative approach is to choose an inductor with saturation current at least
as high as the minimum switch current limit of 2.5A. Another important parameter is the inductor dc resistance.
Usually the lower the dc resistance the higher the efficiency. For a boost converter where the inductor is the
energy storage element, the type and core material of the inductor influences the efficiency as well. The
efficiency difference among inductors can vary up to 10%. Possible inductors are shown in Table 3.
Table 3. Inductor Selection Boost Converter
INDUCTOR VALUE
COMPONENT SUPLIER
SIZE (L×W×H mm)
Isat/DCR
10 mH
Sumida CDRH5D28R/HP
6.2 × 6.2 × 3.0
2.5 A/74 m
10 mH
Sumida CDRH6D26/HP
7 × 7 × 2.8
2.5 A/72 m
10 mH
Sumida CDRH6D28
7 × 7 × 3.0
1.7 A/48 m
10 mH
Sumida CDRH5D28R
6.2 × 6.3 × 3.0
1.3 A/40 m
Rectifier Diode Selection (Boost Converter)
To achieve high efficiency a Schottky diode should be used. The reverse voltage rating should be higher than the
maximum output voltage of the boost converter. The average rectified forward current Iavg, the Schottky diode
needs to be rated for, is equal to the output current Iout.
Iavg = Iout
(10)
Usually a Schottky diode with 2A maximum average rectified forward current rating is sufficient for most
applications. The Schottky rectifier can be selected with lower forward current capability depending on the output
current Iout, but has to be able to dissipate the power. The dissipated power is calculated according to the the
following equation:
PD = Iavg × Vforward
(11)
Table 4. Rectifier Diode Selection (Boost Converter)
Vr/Iavg
Vforward
RqJA
SIZE
COMPONENT SUPPLIER
20V/2A
0.38V at 2A
60°C/W
PowerDI 123
DFLS220L, DIODES Incorporated
20V/2A
0.44V at 2A
25°C/W
SMA
B220A, DIODES Incorporated
20V/2A
0.44V at 2A
75°C/W
SMB
SL22, Vishay Semiconductor
Output Capacitor Selection (Boost Converter)
For the best output voltage filtering, low ESR ceramic output capacitors are recommended. Two 22mF or four
10mF ceramic output capacitors with sufficient voltage rating in parallel are adequate for most applications.
Additional capacitors can be added to improve the load transient regulation. See Table 5 for output capacitor
selection.
Table 5. Output Capacitor Selection (Boost Converter)
CAPACITOR
COMPONENT SUPPLIER
22mF/25V
Murata, GRM32ER61E226KE15
10mF/25V
Murata, GRM31CR61E106KA12
10mF/50V
Taiyo Yuden, UMK325BJ106MM
22
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65171
相关PDF资料 |
PDF描述 |
|---|---|
| TPS65182BRGZT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65182RGZT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65182RGZR | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65185RSLT | POWER SUPPLY SUPPORT CKT, PQCC48 |
| TPS65200YFFR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA36 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS65175ARSHR | 制造商:Texas Instruments 功能描述:LCD BIAS CHIP AND LEVEL SHIFTE 制造商:Texas Instruments 功能描述:IC BIAS PWR SUPP FOR LCD 56VQFN 制造商:Texas Instruments 功能描述:Fully Programmable LCD Bias IC |
| TPS65175CRSHR | 功能描述:LCD TV/Monitor PMIC 56-VQFN (7x7) 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 应用:LCD 电视机/监控器 电流 - 电源:- 电压 - 电源:8.6 V ~ 14.7 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商器件封装:56-VQFN（7x7） 标准包装:1 |
| TPS65175RSHR | 功能描述:LCD 驱动器 Fully Programmable LCD Bias IC RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65176RHDR | 功能描述:其他电源管理 LCD BIAS IC FOR TV RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| TPS65176RHDT | 功能描述:其他电源管理 LCD BIAS IC FOR TV RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。