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| 型号： | TPS51513RHB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 13/38页 |
| 文件大小： | 1159K |
| 代理商： | TPS51513RHB |
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I
UDG-09081
CSN
L
R
DCR
R
NTC
R
PAR
C
SENSE
R
SERIES
R
SEQU
CSP
2
3
SENSE
EQ
DCR
L
C
R
=
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
www.ti.com
The chosen inductor should have the following characteristics:
1. As flat an inductance vs. current curve as possible. Inductor DCR sensing is based on the idea L/DCR is
approximately a constant through the current range of interest.
2. Either high saturation or soft saturation
3. Low DCR for high efficiency, but at least 0.7 m
for proper signal levels.
4. DCR tolerance as low as possible for load-line accuracy.
For this application, the Vishay IHLP5050CZ-06 0.6-mH, 1.85-m inductor is chosen.
Step Five: Design the thermal compensation network. In most designs, NTC thermistors are used to
compensate thermal variations in the resistance of the inductor winding. This winding is generally copper, and so
has a resistance coefficient of 3900 PPM/°C. NTC thermistors, on the other hand, have very non-linear
characteristics and need two or three resistors to linearize them over the range of interest. The typical DCR
circuit is shown in Figure 10.
Figure 10. Typical DCR Sensing Circuit
In this circuit, good performance is obtained when:
where
all of the parameters are defined in Figure 10
REQ is the series/parallel combination of the other four discrete resistors
(11)
CSENSE should be a capacitor type which is stable overtemperature. Use X7R or better dielectric (C0G preferred).
Because calculating these values by hand is difficult, TI offers a spreadsheet using the Excel Solver function..
Contact your local TI representative to get a copy of the spreadsheet.
In the reference design, the following values are input to the spreadsheet:
L
RDCR
Load line
Thermistor R25 and “b” value
The spreadsheet then calculates RSEQU, RSERIES, RPAR, and CSENSE. The RCS_Eff versus temperature curve is
shown in Figure 11.
20
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS51513
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相关代理商/技术参数 |
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| TPS51513RHBR | 功能描述:DC/DC 开关控制器 3-28V Input Sync. Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51513RHBT | 功能描述:DC/DC 开关控制器 3-28V Input Sync. Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51513RHBT | 制造商:Texas Instruments 功能描述:Controller IC |
| TPS51518RUKR | 功能描述:DC/DC 开关控制器 Sgl Phase DCAP & D-CAP2 Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51518RUKT | 功能描述:DC/DC 开关控制器 Sgl Phase DCAP & D-CAP2 Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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