參數(shù)資料
型號(hào)： LT3581IMSE#PBF
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(yè)數(shù)： 7/36頁(yè)
文件大?。?/td> 498K
代理商： LT3581IMSE#PBF
LT3581
3581f
Due to its unique FB pin, the LT3581 can work in a Dual
Inductor Inverting configuration as in Figure 7. Changing
the connections of L2 and the Schottky diode in the SEPIC
topology results in generating negative output voltages.
This solution results in very low output voltage ripple
due to inductor L2 being in series with the output. Output
disconnect is inherently built into this topology due to the
capacitor C1.
Table 3 is a step-by-step set of equations to calculate
component values for the LT3581 when operating as a
dual inductor inverting converter. Input parameters are
input and output voltage, and switching frequency (VIN,
VOUT and fOSC respectively). Refer to the Appendix for
further information on the design equations presented
in Table 3.
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
applicaTions inForMaTion
Figure 7. Dual Inductor Inverting Converter – The Component
Values and Voltages Given Are Typical Values for a 2MHz, 5V to
–12V Inverting Topology Using Coupled Inductors
DUAL INDUCTOR INVERTING CONVERTER COMPONENT
SELECTION (COUPLED OR UN-COUPLED INDUCTORS)
Table 3. Dual Inductor Inverting 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
OUT
1 1
≥
+
;
|
Step 8: COUT
C
I
f
V
OUT
RIPPLE
OSC
OUT
≥
(
)
8
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
mV
A
FB
OUT
=
+
|
.
5
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.
L2
3.3H
D1
20V
1A
VIN
5V
RFAULT
100k
RT
43.2k
L1
3.3H
3581 F07
CSS
100nF
COUT
4.7F
CIN
3.3F
VOUT
–12V
IOUT < 625mA
SW1 SW2
FB
CLKOUT
GATE
VC
SS
VIN
RT
GND
SYNC
FAULT
SHDN
ENABLE
LT3581
CF
47pF
RFB
143k
CC
1nF
RC
11k
C1
1F
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