參數(shù)資料
型號(hào)： LT3758MPMSE#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)： 16/36頁(yè)
文件大小： 554K
代理商： LT3758MPMSE#TRPBF
LT3758
23
3758fc
ApplicAtions inForMAtion
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.
SEPIC Converter: Output Diode Selection
To maximize efficiency, a fast switching diode with a low
forward drop and low reverse leakage is desirable. The
average forward current in normal operation is equal to
the output current, and the peak current is equal to:
ID(PEAK) = 1+
χ
2
IO(MAX)
1
DMAX
It is recommended that the peak repetitive reverse voltage
rating VRRM is higher than VOUT + VIN(MAX) by a safety
margin (a 10V safety margin is usually sufficient).
The power dissipated by the diode is:
PD = IO(MAX) VD
and the diode junction temperature is:
TJ = TA + PD RθJA
The RθJA used in this equation normally includes the RθJC
for the device, plus the thermal resistance from the board,
to the ambient temperature in the enclosure. TJ must not
exceed the diode maximum junction temperature rating.
SEPIC Converter: Output and Input Capacitor Selection
The selections of the output and input capacitors of the
SEPICconverteraresimilartothoseoftheboostconverter.
Please refer to the Boost Converter: Output Capacitor
Selection and Boost Converter: Input Capacitor Selection
sections.
SEPIC Converter: Selecting the DC Coupling Capacitor
The DC voltage rating of the DC coupling capacitor (CDC,
as shown in Figure 1) should be larger than the maximum
input voltage:
VCDC > VIN(MAX)
CDC has nearly a rectangular current waveform. During
the switch off-time, the current through CDC is IIN, while
approximately –IO flows during the on-time. The RMS
rating of the coupling capacitor is determined by the fol-
lowing equation:
IRMS(CDC) >IO(MAX)
VOUT + VD
VIN(MIN)
A low ESR and ESL, X5R or X7R ceramic capacitor works
well for CDC.
INVERTING CONVERTER APPLICATIONS
The LT3758 can be configured as a dual-inductor inverting
topology, as shown in Figure 10. The VOUT to VIN ratio is:
VOUT VD
VIN
=
D
1
D
in continuous conduction mode (CCM).
Figure 10. A Simplified Inverting Converter
RSENSE
CDC
VIN
CIN
L1
D1
COUT
VOUT
3758 F10
+
GATE
GND
LT3758
SENSE
L2
M1
+
–
+ –
+
Inverting Converter: Switch Duty Cycle and Frequency
For an inverting converter operating in CCM, the duty
cycle of the main switch can be calculated based on the
negative output voltage (VOUT)andtheinputvoltage(VIN).
Themaximumdutycycle(DMAX)occurswhentheconverter
has the minimum input voltage:
DMAX =
VOUT VD
VOUT VD VIN(MIN)
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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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