參數(shù)資料
型號(hào)： LT1576
廠商： Linear Technology Corporation
英文描述： 1.5A, 200kHz Step-Down Switching Regulator(可調(diào)輸出，1.5A, 200kHz，步降開(kāi)關(guān)穩(wěn)壓器)
中文描述： 1.5A的，200kHz降壓型開(kāi)關(guān)穩(wěn)壓器（可調(diào)輸出，1.5A的，200kHz的，步降開(kāi)關(guān)穩(wěn)壓器）
文件頁(yè)數(shù)： 28/28頁(yè)
文件大小： 290K
代理商： LT1576
28
LT1576/LT1576-5
sn1576 1576fs LT/TP 0999 4K PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1999
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. L1
is a 33
μ
H 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
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
G
FAX: (408) 434-0507
G
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
0.33
μ
F
C
100pF
D1
1N5818
C1**
100
μ
F
10V TANT
C5**
100
μ
F
10V TANT
C3
22
μ
F
35V TANT
C4**
100
μ
F
D2
1N914
R1
15.8k
R2
4.99k
D3
1N5818
L1A*
33
μ
H
L1B*
V
SW
FB
BIAS
GND
SHDN
V
C
+
+
+
+
RELATED PARTS
PART NUMBER
LT1074/LT1076
LTC
1148
LTC1149
LTC1174
LT1370
LT1371
LT1372/LT1377
LT1374
LT1376
LT1435/LT1436
LT1676/LT1776
LT1777
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
High Efficiency DC/DC Converter
High Efficiency DC/DC Converter
500kHz and 1MHz High Efficiency 1.5A Switching Regulators
4.5A, 500kHz Step-Down Switching Regulator
1.5A, 500kHz Step-Down Switching Regulator
High Efficiency Step-Down Converter
High Efficiency Step-Down Switching Regulators
Low Noise Step-Down Switching Regulator
COMMENTS
40V Input, 100kHz, 5A and 2A
External FET Switches
External FET Switches
0.5A, 150kHz Burst Mode
TM
Operation
42V, 6A, 500kHz Switch
35V, 3A, 500kHz Switch
Boost Topology
External Switches, Low Noise
7.4V to 60V Input, 100kHz/200kHz
48V Input, Internally Limited dv/dt
Burst Mode is a trademark of Linear Technology Corporation.
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.
相關(guān)PDF資料
PDF描述
LT1578-2.5 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LT1578IS8 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LT1578IS8-2.5 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LT1578C CAP 22UF 50V ELECT TG SMD
LT1578CS8 CAP 47UF 50V ELECT TG SMD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT-1576-111-012 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk
LT1576-5 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A, 200kHz Step-Down Switching Regulator
LT1576C 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A, 200kHz Step-Down Switching Regulator
LT1576CS8 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
LT1576CS8#PBF 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)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(kāi)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(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
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