參數(shù)資料
型號(hào)： LT3511MPMS#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.43 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
封裝： LEAD FREE, PLASTIC, MSOP-12/16
文件頁(yè)數(shù)： 10/26頁(yè)
文件大?。?/td> 298K
代理商： LT3511MPMS#PBF
LT3511
18
3511fb
Example:
Design for ripple levels below 50mV.
C = 0.1A 0.39
0.05V 256kHz
= 3.1F
A 10μF, 25V output capacitor is chosen. Remember ce-
ramic capacitors lose capacitance with applied voltage.
The capacitance can drop to 40% of quoted capacitance
at the max voltage rating.
Step 6: Design clamp circuit.
The clamp circuit protects the switch from leakage induc-
tance spike. A DZ clamp is the preferred clamp circuit. The
Zener and the diode need to be chosen.
The maximum Zener value is set according to the maxi-
mum VIN:
VZENER(MAX) ≤ 150V – VIN(MAX)
Example:
VZENER(MAX) ≤ 150V – 72V
VZENER(MAX) ≤ 78V
In addition, power loss in the clamp circuit is inversely
related to the clamp voltage as shown previously. Higher
clamp voltages lead to lower power loss.
A 68V Zener with a maximum of 72V will provide optimal
protection and minimize power loss. Half-watt Zeners will
satisfy most clamp applications involving the LT3511.
Powerlosscanbecalculatedusingtheequationspresented
in the Leakage Inductance and Clamp Circuit section.
The Zener chosen is a 68V 0.5W Zener from On Semicon-
ductor (MMSZ5266BT1G).
Choose a diode that is fast and has sufficient reverse
voltage breakdown:
VREVERSE > VSW(MAX)
VSW(MAX) = VIN(MAX) + VZENER(MAX)
Example:
VREVERSE > 140V
The diode needs to handle the peak switch current of the
switch which was determined to be 0.24A. A 200V, 0.6A
diode from Diodes Inc. (BAV21W) is chosen.
Step 7: Compensation.
Compensation will be optimized towards the end of the de-
sign procedure. Connect a resistor and capacitor from the
VCnodetoground.Usea20kresistoranda2.2nFcapacitor.
Step 8: Select RFB and RTC Resistors.
Use the following equations to choose starting values for
RFB and RTC. Set RREF to 10k.
RFB =
VOUT + VF + 0.55V
(
) NPS RREF
1.2V
RREF = 10k
RTC =
RFB
NPS
Example:
RFB =
15 + 0.5 + 0.55V
(
) 2 10k
1.2V
= 267k
RTC =
267k
2
= 133k
Step 9: Adjust RFB based on output voltage.
Power up the application with application components
connected and measure the regulated output voltage.
Readjust RFB based on the measured output voltage.
RFB(NEW) =
VOUT
VOUT(MEAS)
RFB(OLD)
Example:
RFB(NEW) =
15V
16.8V
267k = 237k
Step 10: Remove RTC and measure output voltage over
temperature.
Measure output voltage in a controlled temperature envi-
ronment like an oven to determine the output temperature
coefficient. Measure output voltage at a consistent load
current and input voltage, across the temperature range
of operation. This procedure will optimize line and load
regulation over temperature.
applicaTions inForMaTion
相關(guān)PDF資料
PDF描述
LT3511HMS#PBF 0.43 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
LT3512EMS#PBF 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
LT3512HMS#TRPBF 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
LT3512MPMS#PBF 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
LT3512EMS#TRPBF 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3512 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter
LT3512_11 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter
LT3512EMS#PBF 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱(chēng):296-25628-2
LT3512EMS#TRPBF 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LT3512EMSPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter
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(xiě)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

*
*
*