參數(shù)資料
型號(hào)： L6730TR
廠商： 意法半導(dǎo)體
英文描述： Adjustable step-down controller with synchronous rectification
中文描述： 可調(diào)式降壓同步整流控制器
文件頁(yè)數(shù)： 30/52頁(yè)
文件大?。?/td> 1370K
代理商： L6730TR
Device description
L6730 - L6730B
30/52
5.14 Bootstrap anti-discharging system
This built-in anti-discharging system keeps the voltage going across the bootstrap capacitor
from going below 3.3V. An internal comparator senses the voltage across the external
bootstrap capacitor and helps to keep it charged, eventually turning on the low-side MOSFET
for approximately 200ns. If the bootstrap capacitor is not charged up enough, the high-side
MOSFET cannot be effectively turned on and it will present a higher R
DS(on)
. In some cases,
the OCP can be also triggered. There are up to two conditions during which the bootstrap
capacitor can be discharged:
fan power supply failure, and
no sink at zero current operation.
●
●
5.14.1 Fan power supply failure
In many applications the fan is driven by a DC motor that uses a DC/DC converter. Often only
the speed of the motor is controlled by varying the voltage applied to the input terminal and
there is no control on the torque because the current is not directly controlled. The current has
to be limited in case of overload or short-circuit, but without stopping the motor.
With the L6730B, the current can be limited without shutting down the system because
constant current protection is provided. In order to vary the motor speed, the output voltage of
the converter must be varied. Both L6730 and L6730B have a dedicated EAREF pin (see
Table
3.
) which provides an external reference to the non-inverting input of the error-amplifier.
In these applications the duty cycle depends on the motor’s speed and sometimes a 100% duty
cycle setting has to be used to attain the maximum speed. In these conditions, the bootstrap
capacitor can not be recharged and the system cannot work properly. Some PWM controllers
limit the maximum duty cycle to 80 or 90% in order to keep the bootstrap capacitor charged, but
this makes performance during the load transient worse. The “bootstrap anti-discharging
system” allows the L6730x to work at 100% without any problem.
Figure 25.: 100% Duty Cycle Operation on page 31
shows The following picture illustrates the
device behavior when the input voltage is 5V and a 100% duty cycle is set by an external
reference.
相關(guān)PDF資料
PDF描述
L6740L Hybrid controller (4+1) for AMD SVID and PVID processors
L6740LTR Hybrid controller (4+1) for AMD SVID and PVID processors
L6741 High current MOSFET driver
L6741TR High current MOSFET driver
L6743 High current MOSFET driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6731B 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Adj. Step-Down w/ Synch Rectification 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(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6731BTR 功能描述:IC CTRLR ADJ STEP DOWN 16-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
L6731D 功能描述:DC/DC 開(kāi)關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6731DTR 功能描述:DC/DC 開(kāi)關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6732 功能描述:DC/DC 開(kāi)關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*