- 您現在的位置：買賣IC網 > PDF目錄98282 > TPS51461RGET (TEXAS INSTRUMENTS INC) SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24 PDF資料下載
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： | 18/31頁 |
| 文件大小： | 1627K |
| 代理商： | TPS51461RGET |
第1頁第2頁第3頁第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頁當前第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
=
=
p
C
M
0
OUT
S
R
G
1
f
150 kHz
2
C
R
p
W
p
m
=
W
0
S
OUT
C
M
f
R
2
C
150 kHz
53m
2
88 F
R
5 k
G
1mS
=
p
=
0
Z
C
f
1
f
2
R
C
10
www.ti.com
SLUSAD9 – DECEMBER 2010
Step Eight
Determine the stability based on the output capacitance COUT.
In order to achieve stable operation. The 0-dB frequency, f0 should be kept less than 1/5 of the switching
frequency (1 MHz). (See Figure 4)
where
RS = RDS(on) × GMC × RLOAD
(14)
.
(15)
Using 4, 22-F capacitors, the compensation resistance, RC can be calculated to be approximately 5 kΩ.
The purpose of the comparator capacitor (CC) is to reduce the DC component to obtain high DC feedback gain.
However, as it causes phase delay, another zero to cancel this effect at f0 is needed. This zero can be
determined by values of CC and the compensation resistor, RC.
(16)
And since RC has previously been derived, the value of CC is calculated to be 2.2 nF. In order to further boost
phase margin, a value of 3.3-nF is chosen for this reference design.
Step Nine
Select decoupling and peripheral components.
For TPS51461 peripheral capacitors use the following minimum values of ceramic capacitance. X5R or better
temperature coefficient is recommended. Tighter tolerances and higher voltage ratings are always appropriate.
V5DRV decoupling
≥ 2.2 F, ≥ 10 V
V5FILT decoupling
≥ 1 F, ≥10 V
VREF decoupling 0.22 F to 1 F,
≥ 4 V
Bootstrap capacitors
≥ 0.1 F, ≥ 10 V
Pull-up resistors on PGOOD, 100 k
Ω
Layout Considerations
Good layout is essential for stable power supply operation. Follow these guidelines for an efficient PCB layout.
Connect PGND pins (or at least one of the pins) to the thermal PAD underneath the device. Also connect
GND pin to the thermal PAD underneath the device. Use four vias to connect the thermal pad to internal
ground planes.
Place VIN, V5DRV, V5FILT and 2VREF decoupling capacitors as close to the device as possible.
Use wide traces for the VIN, VOUT, PGND and SW pins. These nodes carry high current and also serve as
heat sinks.
Place feedback and compensation components as close to the device as possible.
Keep analog signals (SLEW, COMP) away from noisy signals (SW, VBST).
Copyright 2010, Texas Instruments Incorporated
25
Product Folder Link(s): TPS51461
相關PDF資料 |
PDF描述 |
|---|---|
| TPS51511RHLT | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PQCC20 |
| TPS53114PW | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS53114PWR | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS53114PWP | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS53127RGER | DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC24 |
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 |
發布緊急采購，3分鐘左右您將得到回復。