參數(shù)資料
型號(hào)： LT3757HMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 13/36頁(yè)
文件大?。?/td> 436K
代理商： LT3757HMSE#TRPBF
LT3757
20
3757fc
applicaTions inForMaTion
where VSN is the snubber capacitor voltage. A smaller
VSN results in a larger snubber loss. A reasonable VSN is
2 to 2.5 times of:
VOUT NP
NS
LLKistheleakageinductanceoftheprimarywinding,which
is usually specified in the transformer characteristics. LLK
canbeobtainedbymeasuringtheprimaryinductancewith
the secondary windings shorted. The snubber capacitor
value(CCN)canbedeterminedusingthefollowingequation:
CCN =
VSN
VSN RCN f
where VSN is the voltage ripple across CCN. A reasonable
VSN is 5% to 10% of VSN. The reverse voltage rating of
DSN should be higher than the sum of VSN and VIN(MAX).
Flyback Converter: Sense Resistor Selection
In a flyback converter, when the power switch is turned
on, the current flowing through the sense resistor
(ISENSE) is:
ISENSE = ILP
Set the sense voltage at ILP(PEAK) to be the minimum of
the SENSE current limit threshold with a 20% margin. The
sense resistor value can then be calculated to be:
RSENSE =
80mV
ILP(PEAK)
Flyback Converter: Power MOSFET Selection
For the flyback configuration, the MOSFET is selected with
a VDC rating high enough to handle the maximum VIN, the
reflected secondary voltage and the voltage spike due to
theleakageinductance.ApproximatetherequiredMOSFET
VDC rating using:
BVDSS > VDS(PEAK)
where:
VDS(PEAK) = VIN(MAX) + VSN
The power dissipated by the MOSFET in a flyback con-
verter is:
PFET = I2M(RMS) RDS(ON) + 2 V2DS(PEAK) IL(MAX)
CRSS f/1A
The first term in this equation represents the conduction
losses in the device, and the second term, the switching
loss. CRSS is the reverse transfer capacitance, which is
usually specified in the MOSFET characteristics.
From a known power dissipated in the power MOSFET, its
junction temperature can be obtained using the following
equation:
TJ = TA + PFET θJA = TA + PFET (θJC + θCA)
TJ must not exceed the MOSFET maximum junction
temperature rating. It is recommended to measure the
MOSFETtemperatureinsteadystatetoensurethatabsolute
maximum ratings are not exceeded.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LT3757IDD#PBF 制造商:Linear Technology 功能描述:DC-DC CONTROLLER SEPIC 1MHZ 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, SEPIC, 1MHZ, DFN-10
LT3757IDD#TRPBF 功能描述:IC REG CTRLR BST FLYBK INV 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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