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| 型号： | TPS51461RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 16/31页 |
| 文件大小： | 1627K |
| 代理商： | TPS51461RGET |
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页第15页当前第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
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P P
I
6 A
0.25
1.5 A
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m
10
IN
10
SW
IN
P P
V
0.8
V
5
0.8
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1 5
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dT
L
0.45 H
I
1.5 A
m
=
m
SLEW
DAC
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10 A
C
10 nF
1 mV
SR
s
www.ti.com
SLUSAD9 – DECEMBER 2010
DESIGN PROCEDURE
The simplified design procedure is done for a non-droop application using the TPS51461 converter.
Step One
Determine the specifications.
The System Agent Rail requirements provide the following key parameters:
1. V00 = 0.90 V
2. V10 = 0.80 V
3. ICC(max) = 6 A
4. IDYN(max) = 2 A
5. ICC(tdc) = 3 A
Step Two
Determine system parameters.
The input voltage range and operating frequency are of primary interest. For example:
1. VIN = 5 V
2. fSW = 1 MHz
Step Three
Determine inductor value and choose inductor.
Smaller values of inductor have better transient performance but higher ripple and lower efficiency. Higher values
have the opposite characteristics. It is common practice to limit the ripple current to 25% to 50% of the maximum
current. In this case, use 25%:
(7)
At fSW = 1 MHz, with a 5-V input and a 0.80-V output:
(8)
For this application, a 0.42-H, 1.55-m
Ω inductor from NEC-TOKIN with part number MPCG0740LR42C is
chosen.
Step Four
Set the output voltage.
The output voltage is determined by the VID settings. The actual voltage set point for each VID setting is listed in
Table 1. No external resistor dividers are needed for this design.
Step Five
Calculate CSLEW.
VID pin transition and soft-start time is determined by CSLEW and 10 A of internal current source.
(9)
The slower slew rate is desired to minimize large inductor current perturbation during startup and voltage
transition, thus reducing the possibility of acoustic noise.
Copyright 2010, Texas Instruments Incorporated
23
Product Folder Link(s): TPS51461
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51462 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAPa?￠ Mode Synchronous Step-Down Integrated FETs Converter With 2-Bit VID |
| TPS51462RGER | 功能描述:开关变换器、稳压器与控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS51462RGET | 功能描述:开关变换器、稳压器与控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS51463 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAP+? Mode Synchronous Step-Down Integrated FETs Converter |
| TPS51463RGER | 功能描述:直流/直流开关转换器 3.3V/5Vin,Sync SD Integr FET Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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