參數(shù)資料
型號(hào)： 3745SN
廠商： Linear Technology Corporation
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 32/32頁(yè)
文件大小： 309K
代理商： 3745SN
32
LT1374
1374fb
LT/TP 0102 1.5K REV B PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
G
FAX: (408) 434-0507
G
www.linear.com
TYPICAL APPLICATIO
N
U
Dual Output SEPICConverter
The circuit in Figure 17 generates both positive and
negative 5V outputs with a single piece of magnetics. The
two inductors shown are actually just two windings on a
standard BH Electronics inductor. The topology for the 5V
output is a standard buck converter. The –5V topology
would be a simple flyback winding coupled to the buck
converter if C4 were not present. C4 creates the SEPIC
(Single-Ended Primary Inductance Converter) topology
which improves regulation and reduces ripple current in
L1. Without C4, the voltage swing on L1B compared to
L1A would vary due to relative loading and coupling
RELATED PARTS
PART NUMBER
LT1074/LT1076
LTC
1148
LTC1149
LTC1174
LT1176
LT1370
LT1371
LT1372/LT1377
LTC1735
LT1765
LT1766
LT1767
Burst Mode is a registered trademark of Linear Technology Corporation.
DESCRIPTION
Step-Down Switching Regulators
High Efficiency Synchronous Step-Down Switching Regulator
High Efficiency Synchronous Step-Down Switching Regulator
High Efficiency Step-Down and Inverting DC/DC Converter
Step-Down Switching Regulator
High Efficiency DC/DC Converter
High Efficiency DC/DC Converter
500kHz and 1MHz High Efficiency 1.5A Switching Regulators
High Efficiency Step-Down Converter
3A Step-Down Switching Regulator
1.5A Step-Down Switching Regulator
1.5A Step-Down Switching Regulator
COMMENTS
40V Input, 100kHz, 5A and 2A
External FET Switches
External FET Switches
0.5A, 150kHz Burst Mode
Operation
PDIP LT1076
42V, 6A, 500kHz Switch
35V, 3A, 500kHz Switch
Boost Topology
External Switches, Very High Efficiency
1.25MHz, 3A, 25V Input, SO-8 and TSSOP16 Packages
200kHz, 1.5A, 60V Input, SO-8 and GN16 Packages
1.25MHz, 1.5A, 25V Input, MS8 Package
BOOST
LT1374-5
V
IN
OUTPUT
5V
OUTPUT
–5V
* L1 IS A SINGLE CORE WITH TWO WINDINGS
BH ELECTRONICS #501-0726
** TOKIN IE475ZY5U-C304
IF LOAD CAN GO TO ZERO, AN OPTIONAL
PRELOAD OF 1k TO 5k MAY BE USED TO
IMPROVE LOAD REGULATION
INPUT
6V
TO 25V
GND
1374 F17
C2
0.27
μ
F
C
0.01
μ
F
R
C
470
D1
MBRD340
C1**
100
μ
F
10V TANT
C5**
100
μ
F
10V TANT
C3
22
μ
F
35V TANT
C4**
4.7nF
D2
CMDSH-3
D3
MBRD340
L1A*
6.8
μ
H
L1B*
V
SW
SENSE
V
C
BIAS
GND
SHDN
+
+
+
+
Figure 17. Dual Output SEPIC Converter
losses. C4 provides a low impedance path to maintain an
equal voltage swing in L1B, improving regulation. In a
flyback converter, during switch on time, all the converter’s
energy is stored in L1A only, since no current flows in L1B.
At switch off, energy is transferred by magnetic coupling
into L1B, powering the –5V rail. C4 pulls L1B positive
during switch on time, causing current to flow, and energy
to build in L1B and C4. At switch off, the energy stored in
both L1B and C4 supply the –5V rail. This reduces the
current in L1A and changes L1B current waveform from
square to triangular. For details on this circuit see Design
Note 100.
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