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參數(shù)資料
| 型號： | LT3574EMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大小： | 285K |
| 代理商： | LT3574EMS#PBF |
LT3574
3574f
applications inForMation
Figure 5. Maximum Voltages for SW Pin Flyback Waveform
Figure 4. RCD Clamp
Figure 6. Good Snubber Diode Limits SW Pin Voltage
Figure 7. Bad Snubber Diode Does Not Limit SW Pin Voltage
< 50V
< 55V
< 60V
VSW
tOFF > 350ns
TIME
tSP < 150ns
3574 F05
100ns/DIV
10V/DIV
3574 F06
100ns/DIV
10V/DIV
3574 F07
3574 F04
LS
D
R
C
Secondary Leakage Inductance
In addition to the previously described effects of leakage
inductance in general, leakage inductance on the second-
ary in particular exhibits an additional phenomenon. It
forms an inductive divider on the transformer secondary
that effectively reduces the size of the primary-referred
flyback pulse used for feedback. This will increase the
output voltage target by a similar percentage. Note that
unlike leakage spike behavior, this phenomenon is load
independent. To the extent that the secondary leakage
inductance is a constant percentage of mutual inductance
(overmanufacturingvariations),thiscanbeaccommodated
by adjusting the RFB/RREF resistor ratio.
Winding Resistance Effects
Resistance in either the primary or secondary will reduce
overall efficiency (POUT/PIN). Good output voltage regula-
tion will be maintained independent of winding resistance
due to the boundary mode operation of the LT3574.
Bifilar Winding
A bifilar, or similar winding technique, is a good way to
minimize troublesome leakage inductances. However, re-
member that this will also increase primary-to-secondary
capacitanceandlimittheprimary-to-secondarybreakdown
voltage, so, bifilar winding is not always practical. The
Linear Technology applications group is available and
extremely qualified to assist in the selection and/or design
of the transformer.
相關(guān)PDF資料 |
PDF描述 |
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| LT3574IMS#TRPBF | 1.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3579EUFD#PBF | SWITCHING REGULATOR, PQCC20 |
| LT3579IUFD-1#TRPBF | SWITCHING REGULATOR, PQCC20 |
| LT3579IFE#PBF | SWITCHING REGULATOR, PDSO20 |
| LT3579IFE-1#TRPBF | SWITCHING REGULATOR, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3574EMSTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574IMS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574IMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .65A 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 |
| LT3574IMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .65A 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 |
| LT3574IMSPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
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