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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)： | 13/28頁 |
| 文件大?。?/td> | 320K |
| 代理商： | LT3958IUHE#PBF |
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LT3958
20
3958f
APPLICATIONS INFORMATION
By making L1 = L2, and winding them on the same core, the
value of inductance in the preceding equation is replaced
by 2L, due to mutual inductance:
L =
VIN(MIN)
ΔISW
DMAX
This maintains the same ripple current and energy storage
in the inductors. The peak inductor currents are:
IL1(PEAK) = IL1(MAX) + 0.5 ΔIL1
IL2(PEAK) = IL2(MAX) + 0.5 ΔIL2
The maximum RMS inductor currents are approximately
equal to the maximum average inductor currents.
Based on the preceding equations, the user should choose
the inductors having sufcient saturation and RMS cur-
rent ratings.
SEPIC Converter: Output Diode Selection
To maximize efciency, 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.
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 sufcient).
The power dissipated by the diode is:
PD = IO(MAX) VD
where VD is diode’s forward voltage drop, 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
SEPIC converter are similar to those of the boost converter.
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 ows 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 LT3958 can be congured as a dual-inductor inverting
topology, as shown in Figure 8. The VOUT to VIN ratio is:
VOUT VD
VIN
= D
1D
in continuous conduction mode (CCM).
Figure 8. A Simplied Inverting Converter
CDC
VIN
CIN
L1
D1
COUT
VOUT
3758 F10
+
GND
LT3958
SW
L2
+
–
+
–
+
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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