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參數資料
| 型號： | TPS51461RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件頁數： | 4/31頁 |
| 文件大小： | 1627K |
| 代理商： | TPS51461RGET |
第1頁第2頁第3頁當前第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
=
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS51462 | 制造商:TI 制造商全稱: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:開關變換器、穩壓器與控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS51462RGET | 功能描述:開關變換器、穩壓器與控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS51463 | 制造商:TI 制造商全稱: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/直流開關轉換器 3.3V/5Vin,Sync SD Integr FET Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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