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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： | 4/31页 |
| 文件大小： | 1627K |
| 代理商： | TPS51461RGET |
第1页第2页第3页当前第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
=
OUT
ON
IN
SW
V
1
t
V
f
+
V
SLEW
+
–
R
C
+
PWM
Comparator
R
DS(on)
G
MV
= 1 mS
Driver
L
OUT
ESR
C
OUT
R
OUT
UDG-10190
R
LOAD
8 kW
+
–
+
G
MC
= 1 mS
C
VREF
SLUSAD9 – DECEMBER 2010
www.ti.com
PWM Frequency and Adaptive on Time Control
In general, the on-time (at the SW node) can be estimated byEquation 1.
where
fSW is the frequency selected by the connection of the MODE pin
(1)
The on-time pulse is sent to the top FET. The inductor current and the current feedback rises to peak value.
Each ON pulse is latched to prevent double pulsing. Switching frequency settings are shown in Table 3.
Non-Droop Configuration
The TPS51461 can be configured as a non-droop solution. The benefit of a non-droop approach is that load
regulation is flat, therefore, in a system where tight DC tolerance is desired, the non-droop approach is
recommended. For the Intel system agent application, non-droop is recommended as the standard configuration.
The non-droop approach can be implemented by connecting a resistor and a capacitor between the COMP and
the VREF pins. The purpose of the type II compensation is to obtain high DC feedback gain while minimizing the
phase delay at unity gain cross over frequency of the converter.
The value of the resistor (RC) can be calculated using the desired unity gain bandwidth of the converter, and the
value of the capacitor (CC) can be calculated by knowing where the zero location is desired. An application tool
that calculates these values is available from your local TI Field Application Engineer.
Figure 4 shows the basic implementation of the non-droop mode using the TPS51461.
Figure 4. Non-Droop Mode Basic Implementation
Figure 5 shows the load regulation of the system agent rail using non-droop configuration.
Figure 6 shows the transient response of TPS51461 using non-droop configuration where COUT = 4 × 22 F. The
applied step load is from 0 A to 2 A.
12
Copyright 2010, Texas Instruments Incorporated
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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