參數(shù)資料
型號(hào)： LT3511MPMS#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 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)： 9/26頁(yè)
文件大?。?/td> 298K
代理商： LT3511MPMS#PBF
LT3511
17
3511fb
Example:
LPRI ≥
400ns 2 15 + 0.5
(
)
0.055
LPRI ≥ 225H
LPRI ≥
100ns 72
0.055
LPRI ≥ 131H
In addition, primary inductance will determine switching
frequency.
fSW =
1
tON + tOFF
=
1
LPRI IPEAK
VIN
+
LPRI IPEAK
NPS VOUT + VF
(
)
IPEAK =
VOUT IOUT 2
η VIN D
Example:
Let’s calculate switching frequency at our nominal VIN
of 48V.
D =
15 + 0.5
(
) 2
15 + 0.5
(
) 2+ 48
= 0.39
IPEAK =
15V 0.1A 2
0.75 48V 0.39
= 0.21A
Let’s choose LPRI = 350μH. Remember, most transform-
ers specify primary inductance with a tolerance of ±20%.
fSW = 256kHz
Finally, the transformer needs to be rated for the correct
saturation current level across line and load conditions.
In the given example, the worst-case condition for switch
current is at minimum VIN and maximum load.
IPEAK =
VOUT IOUT 2
η VIN D
IPEAK =
15V 0.1A 2
0.75 36V 0.46
= 0.24A
Ensure that the saturation current covers steady-state
operation, start-up and transient conditions. To satisfy
theseconditions,chooseasaturationcurrent50%ormore
higher than the steady-state calculation. In this example, a
saturation current between 400mA and 500mA is chosen.
Table 1 presents a list of pre-designed flyback transform-
ers.Forthisapplication,theWürth750311660transformer
will be used.
Step 4: Choose the correct output diode.
Thetwomaincriteriaforchoosingtheoutputdiodeinclude
forward current rating and reverse voltage rating. The
maximum load requirement is a good first-order guess
at the average current requirement for the output diode.
A better metric is RMS current.
IRMS =IPEAK(VIN(MIN)) NPS
1– DVIN(MIN)
3
Example:
IRMS = 0.24 2
1– 0.46
3
= 0.2A
Next calculate reverse voltage requirement using maxi-
mum VIN:
VREVERSE = VOUT +
VIN(MAX)
NPS
Example:
VREVERSE = 15V +
72V
2
= 51V
A 0.5A, 60V diode from Diodes Inc. (SBR0560S1) will
be used.
Step 5: Choose an output capacitor.
Theoutputcapacitorchoiceshouldminimizeoutputvoltage
ripple and balance the trade-off between size and cost for
a larger capacitor. Use the equation below at nominal VIN:
C =
IOUT D
VOUT fSW
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:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter
LT3512_11 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型: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:296-25628-2
LT3512EMS#TRPBF 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型: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 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LT3512EMSPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter
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