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參數資料
| 型號： | TPS51317RGBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 3.50 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數： | 3/28頁 |
| 文件大小： | 1000K |
| 代理商： | TPS51317RGBR |
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=
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
SLUSAH9
– MARCH 2011
PWM Frequency and Adaptive on Time Control
In general, the on-time (at the SW node) can be estimated by Equation 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 .
Non-Droop Configuration
The TPS51317 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 TPS51317.
Figure 4. Non-Droop Mode Basic Implementation
Figure 5 shows shows the load regulation using non-droop configuration.
Figure 6 shows the transient response of TPS51317 using non-droop configuration, where COUT = 6 x 22 F. The
applied step load is from 0 A to 3 A.
Copyright
2011, Texas Instruments Incorporated
11
Product Folder Link(s): TPS51317
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS51317RGBT | 功能描述:直流/直流開關轉換器 3.3V/5Vin,6A,DCAP Mode Sync 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 |
| TPS51362RVER | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
| TPS51362RVET | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
| TPS51363 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:22-V Input, 8-A or 10-A Converter With Integrated FET |
| TPS51363RVER | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 3V to 22V 28-Pin VQFN EP T/R 制造商:Texas Instruments 功能描述:IC REG BCK SYNC ADJ 10/8A 28VQFN |
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