參數(shù)資料
型號： LT3581IMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁數(shù)： 6/36頁
文件大?。?/td> 498K
代理商： LT3581IMSE#TRPBF
LT3581
3581f
applicaTions inForMaTion
Figure 6. SEPIC Converter – The Component Values and Voltages
Given Are Typical Values for a 700kHz, Wide Input Range (3V to
16V) SEPIC Converter with 5V Out
SEPIC CONVERTER COMPONENT SELECTION
(COUPLED OR UN-COUPLED INDUCTORS)
The LT3581 can also be configured as a SEPIC as shown in
Figure 6. This topology allows for positive output voltages
that are lower, equal, or higher than the input voltage. Out-
put disconnect is inherently built into the SEPIC topology,
meaning no DC path exists between the input and output
due to capacitor C1. This implies that a PMOS controlled
by the GATE pin is not required in the power path.
Table 2 is a step-by-step set of equations to calculate
component values for the LT3581 when operating as a
SEPIC converter. Input parameters are input and output
voltage, and switching frequency (VIN, VOUT and fOSC re-
spectively). Refer to the Appendix for further information
on the design equations presented in Table 2.
Variable Definitions:
VIN = Input Voltage
VOUT = Output Voltage
DC = Power Switch Duty Cycle
fOSC = Switching Frequency
IOUT = Maximum Average Output Current
IRIPPLE = Inductor Ripple Current
Table 2. SEPIC Design Equations
PARAMETERS/EQUATIONS
Step 1:
Inputs
Pick VIN, VOUT, and fOSC to calculate equations below.
Step 2:
DC
DC
V
OUT
IN
OUT
+
0 5
0 3
.
– .
Step 3:
L
L
V
V DC
f
A
L
V
TYP
IN
OSC
MIN
IN
= (
)
= (
)
– .
0 3
1
0 3
2 DDC
A f
DC
L
V
V DC
f
OSC
MAX
IN
O
–
.
–
– .
1
2 2
1
0 3
(
)
(
)
= (
)
SSC
A
0 35
.
(1)
(2)
(3)
Pick L out of a range of inductor values where the minimum
value of the range is set by LTYP or LMIN, whichever is higher.
The maximum value of the range is set by LMAX. See
Appendix on how to choose current rating for inductor value
chosen.
Pick L1 = L2 = L for coupled inductors.
Pick L1
L2 = L for un-coupled inductors.
Step 4:
IRIPPLE
I
V
V DC
f
L
RIPPLE
IN
OSC
= (
)
– .
0 3
L = L1 = L2 for coupled inductors.
L = L1
L2 for un-coupled inductors.
Step 5:
IOUT
I
A
I
DC
OUT
RIPPLE
=
(
)
3 3
2
1
.
–
Step 6:
D1
V
I
R
IN
OUT AVG
OUT
>
+
>
;
Step 7:
C1
C
F V
V
RATING
IN
1 1
≥
;
Step 8:
COUT
C
I
DC
f
V
OUT
OSC
OUT
≥
0 005
.
Step 9:
CIN
C
A DC
f
V
I
IN
VIN
PWR
OSC
IN
RIP
≥
+
≥
+
3 3
45
0 005
.
PPLE
OSC
IN
f
V
8
0 005
.
Refer to Input Capacitor Selection in Appendix for definition
of CVIN and CPWR.
Step 10:
RFB
R
V
A
FB
OUT
=
– .
.
1 215
83 3
Step 11:
RT
R
f
in MHz and R in k
T
OSC
T
=
87 6
1
.
– ;
Note 1: The maximum design target for peak switch current is 3.3A and is
used in this table.
Note 2: The final values for COUT, CIN and C1 may deviate from the above
equations in order to obtain desired load transient performance.
D1
30V, 2A
VIN
3V TO 16V
RFAULT
100k
RT
124k
L1
3.3H
3581 F06
CSS
1F
COUT
22F
2
L2
3.3H
CIN
22F
VOUT
5V
IOUT < 0.9A (VIN = 3V)
IOUT < 1.5A (VIN = 12V)
SW1 SW2
FB
CLKOUT
GATE
VC
SS
VIN
RT
GND
SYNC
FAULT
SHDN
ENABLE
LT3581
CF
100pF
C1
1F
RFB
45.3k
CC
2.2nF
RC
7.87k
相關(guān)PDF資料
PDF描述
LT3581IMSE#PBF SWITCHING REGULATOR, PDSO16
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LT3582EUD#PBF 功能描述:IC REG BOOST INV ADJ DL 16QFN 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:- 標準包裝:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
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