參數(shù)資料
型號： LT3958IUHE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC36
封裝： 5 X 6 MM, LEAD FREE, PLASTIC, QFN-36
文件頁數(shù)： 10/28頁
文件大小： 320K
代理商： LT3958IUHE#PBF
LT3958
18
3958f
APPLICATIONS INFORMATION
The snubber resistor value (RSN) can be calculated by the
following equation:
RSN = 2
V2SN VSN VOUT
NP
NS
I2SW(PEAK) LLK
LLK is the leakage inductance of the primary winding,
which is usually specied in the transformer character-
istics. LLK can be obtained by measuring the primary
inductance with the secondary windings shorted. The
snubber capacitor value (CSN) can be determined using
the following equation:
CSN =
VSN
ΔVSN RSN
where
ΔVSN is the voltage ripple across CSN. A reasonable
ΔVSN 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: Output Diode Selection
The output diode in a yback converter is subject to large
RMS current and peak reverse voltage stresses. A fast
switching diode with a low forward drop and a low reverse
leakage is desired. Schottky diodes are recommended if
the output voltage is below 100V.
Approximate the required peak repetitive reverse voltage
rating VRRM using:
VRRM >
NS
NP
VIN(MAX) + VOUT
The power dissipated by the diode is:
PD = IO(MAX) VD
and the diode junction temperature is:
TJ = TA + PD RθJA
The RθJA to be used in this equation normally includes the
RθJCforthedevice,plusthethermalresistancefromtheboard
to the ambient temperature in the enclosure. TJ must not
exceed the diode maximum junction temperature rating.
Flyback Converter: Output Capacitor Selection
The output capacitor of the yback converter has a similar
operation condition as that of the boost converter. Refer to
the Boost Converter: Output Capacitor Selection section
for the calculation of COUT and ESRCOUT.
The RMS ripple current rating of the output capacitors
in continuous operation can be determined using the
following equation:
IRMS(COUT),CONTINUOUS ≈ IO(MAX)
DMAX
1DMAX
Flyback Converter: Input Capacitor Selection
The input capacitor in a yback converter is subject to
a large RMS current due to the discontinuous primary
current. To prevent large voltage transients, use a low
ESR input capacitor sized for the maximum RMS current.
The RMS ripple current rating of the input capacitors in
continuous operation can be determined using the fol-
lowing equation:
IRMS(CIN),CONTINUOUS ≈
POUT(MAX)
VIN(MIN) η
1DMAX
DMAX
SEPIC CONVERTER APPLICATIONS
The LT3958 can be congured as a SEPIC (single-ended
primary inductance converter), as shown in Figure 1. This
topology allows for the input to be higher, equal, or lower
than the desired output voltage. The conversion ratio as
a function of duty cycle is:
VOUT + VD
VIN
= D
1D
in continuous conduction mode (CCM).
In a SEPIC converter, no DC path exists between the input
and output. This is an advantage over the boost converter
for applications requiring the output to be disconnected
from the input source when the circuit is in shutdown.
相關(guān)PDF資料
PDF描述
LT3958EUHE#PBF SWITCHING REGULATOR, PQCC36
LT3958EUHE#TRPBF SWITCHING REGULATOR, PQCC36
LT4180MPGN#PBF POWER SUPPLY SUPPORT CKT, PDSO24
LT4180IGN#PBF POWER SUPPLY SUPPORT CKT, PDSO24
LT4180EGN#TRPBF POWER SUPPLY SUPPORT CKT, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3958IUHETRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Input Voltage, Boost, Flyback, SEPIC and Inverting Converter
LT3959 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Voltage Range Boost/SEPIC/Inverting Converter with 6A, 40V Switch
LT3959EFE#PBF 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ 38TSSOP
LT3959EFE#PBF 制造商:Linear Technology 功能描述:DC-DC CONV BOOST/INVERTING TSSOP-38 制造商:Linear Technology 功能描述:DC-DC CONV, BOOST/INVERTING, TSSOP-38
LT3959EFE#TRPBF 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ 38TSSOP
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