- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄43901 > L7981TR (STMICROELECTRONICS) SWITCHING REGULATOR, DSO8 PDF資料下載
參數(shù)資料
| 型號： | L7981TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, DSO8 |
| 封裝： | 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFP-8 |
| 文件頁數(shù)： | 22/44頁 |
| 文件大?。?/td> | 1315K |
| 代理商： | L7981TR |
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頁第18頁第19頁第20頁第21頁當(dāng)前第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頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁
L7981
Application informations
Doc ID 15182 Rev 3
29/44
of heat. The RthJA measured on the demonstration board described in the following
paragraph is about 60°C/W for the VFQFPN package and about 40°C/W for the HSOP
package.
Figure 16.
Switching losses
6.6
Layout considerations
The PC board layout of switching DC/DC regulator is very important to minimize the noise
injected in high impedance nodes and interferences generated by the high switching current
loops.
In a step down converter the input loop (including the input capacitor, the power MOSFET
and the free wheeling diode) is the most critical one. This is due to the fact that the high
value pulsed current are flowing through it. In order to minimize the EMI, this loop has to be
as short as possible.
The feedback pin (FB) connection to external resistor divider is a high impedance node, so
the interferences can be minimized placing the routing of feedback node as far as possible
from the high current paths. To reduce the pick up noise the resistor divider has to be placed
very close to the device.
To filter the high frequency noise, a small bypass capacitor (220 nF - 1 F) can be added as
close as possible to the input voltage pin of the device.
Thanks to the exposed pad of the device, the ground plane helps to reduce the thermal
resistance junction to ambient; so a large ground plane enhances the thermal performance
of the converter allowing high power conversion.
In Figure 17 a layout example is shown.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L8219LP | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO28 |
| L8219P | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO36 |
| L8229 | STEPPER MOTOR CONTROLLER, 1.5 A, PDSO24 |
| L9484 | SWITCHING REGULATOR, 460 kHz SWITCHING FREQ-MAX, PSFM8 |
| L9903 | BRUSH DC MOTOR CONTROLLER, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L7983 | 制造商:Leviton Manufacturing Co 功能描述: |
| L7985 | 功能描述:線性穩(wěn)壓器 - 標準 2A Step Down REG 4.5V to 38V 250 KHz RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L7985A | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2A DC 4.5V to 38V 250 KHz Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L7985ATR | 功能描述:線性穩(wěn)壓器 - 標準 2A Step-Down REG 2A DC 4.5 to 38V RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| L7985TR | 功能描述:線性穩(wěn)壓器 - 標準 2A Step-Down Reg 4.5V to 38V 250 KHz RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。