參數(shù)資料
型號(hào)： L5980
廠商： 意法半導(dǎo)體
英文描述： 0.7A step-down switching regulator
中文描述： 0.7A的降壓開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 27/37頁(yè)
文件大?。?/td> 959K
代理商： L5980
Application informations
L5980
27/37
of heat. The Rth
JA
measured on the demoboard described in the following paragraph is
about 60°/W.
Figure 16.
Switching losses
5.6
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 capacitor 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
L5980TR 0.7A step-down switching regulator
L5985 2A step-down switching regulator
L5985TR 2A step-down switching regulator
L5991 PRIMARY CONTROLLER WITH STANDBY
L5991A PRIMARY CONTROLLER WITH STANDBY
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5980_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:0.7 A step-down switching regulator
L5980TR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 700mA Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
L5980TR-CUT TAPE 制造商:ST 功能描述:L5980 Series 15 V 250 kHz 0.7 A Step Down Switching Regulator - VFQFPN-8
L5981 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 1A STEP-DOWN SWITCH REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
L5981_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 A step-down switching regulator
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