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LT1576

LT1576首页预览图
型号: LT1576
PDF文件:
  • LT1576 PDF文件
  • LT1576 PDF在线浏览
功能描述: 1.5A, 200kHz Step-Down Switching Regulator
PDF文件大小: 290.41 Kbytes
PDF页数: 共28页
制造商: LINER[Linear Technology]
制造商LOGO: LINER[Linear Technology] LOGO
制造商网址: http://www.linear.com
捡单宝LT1576
PDF页面索引
120%
28
LT1576/LT1576-5
1576f LT/TP 0999 4K • PRINTED IN USA
LINEAR T ECHNOLOGY CORPORATION 1999
TYPICAL APPLICATION
U
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
FAX: (408) 434-0507
www.linear-tech.com
BOOST
LT1576
V
IN
OUTPUT
5V
OUTPUT
–5V
* L1 IS A SINGLE CORE WITH TWO WINDINGS
COILTRONICS CTX33-2
** AVX TSPD107M010
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
1576 F17
C2
0.33µF
C
C
100pF
D1
1N5818
C1**
100µF
10V TANT
C5**
100µF
10V TANT
C3
22µF
35V TANT
C4**
100µF
D2
1N914
R1
15.8k
R2
4.99k
D3
1N5818
L1A*
33µH
L1B*
V
SW
FB
BIAS
GND
SHDN
V
C
+
+
+
+
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Burst Mode is a trademark of Linear Technology Corporation.
Figure 17. Dual Output SEPIC Converter
Dual Output SEPIC␣ Converter
The circuit in Figure 17 generates both positive and
negative 5V outputs with a single piece of magnetics. L1
is a 33µH surface mount inductor from Coiltronics. It is
manufactured with two identical windings that can be
connected in series or parallel. 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
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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