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| 型号： | LT3579EFE-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO20 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件页数： | 18/40页 |
| 文件大小： | 503K |
| 代理商： | LT3579EFE-1#PBF |
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LT3579/LT3579-1
25
35791f
appenDix
Table 5. Inductor Manufacturers
Vishay
IHLP-2020BZ-01 and
IHLP-2525CZ-01 Series
www.vishay.com
Coilcraft
XLP, MLC and MSS Series www.coilcraft.com
Cooper Bussmann DRQ125 and DRQ127
Series
www.cooperbussmann.
com
Sumida
CDRH series
www.sumida.com
TDK
RLF and SLF series
www.tdk.com
Würth
WE-PD, WE-PDF, WE-HC
and WE-DD Series
www.we-online.com
Minimum Inductance
Although there can be a tradeoff with efficiency, it is often
desirable to minimize board space by choosing smaller
inductors. When choosing an inductor, there are three
conditionsthatlimittheminimuminductance;(1)providing
adequate load current, (2) avoidance of subharmonic
oscillation, and (3) supplying a minimum ripple current
to avoid false tripping of the current comparator.
Adequate Load Current
Smallvalueinductorsresultinincreasedripplecurrentsand
thus, due to the limited peak switch current, decrease the
average current that can be provided to the load. In order
to provide adequate load current, L should be at least:
LBOOST >
DC
VIN VCESAT
(
)
2
fOSC IPK
VOUT IOUT
VIN η
or
LDUAL >
DC
VIN VCESAT
(
)
2
fOSC IPK
|VOUT |IOUT
VIN η
IOUT
Boost
Topology
SEPIC
or
Inverting
Topologies
where:
LBOOST = L1 for Boost Topologies (see Figure 6)
LDUAL = L1 = L2 for Coupled Dual Inductor
Topologies (see Figures 7 and 8)
LDUAL = L1 || L2 for Uncoupled Dual Inductor
Topologies (see Figures 7 and 8)
DC
= SwitchDutyCycle(seePowerSwitchDuty
Cycle section in Appendix)
IPK
= Maximum Peak Switch Current; Should
Not Exceed 6A for a Combined SW1 +
SW2 Current or 3.4A of SW1 Current (see
Electrical Characteristics section.)
η
= Power Conversion Efficiency (typically 90%
for Boost and 85% for Dual Inductor
Topologies at high currents)
fOSC
= Switching Frequency
IOUT
= Maximum Output Current
Negative values of LBOOST or LDUAL indicate that the
output load current, IOUT, exceeds the switch current limit
capability of the LT3579.
Avoiding Sub-Harmonic Oscillations
The LT3579’s internal slope compensation circuit will
prevent sub-harmonic oscillations that can occur when
the duty cycle is greater than 50%, provided that the
inductance exceeds a minimum value. In applications that
operate with duty cycles greater than 50%, the inductance
must be at least:
LMIN =
VIN VCESAT
(
) 2DC1
(
)
4A
fOSC 1DC
(
)
where:
LMIN = L1 for Boost Topologies (see Figure 6)
LMIN = L1 = L2 for Coupled Dual Inductor
Topologies (see Figures 7 and 8)
LMIN = L1 || L2 for Uncoupled Dual Inductor
Topologies (see Figures 7 and 8)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3579EFE-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EUFD#PBF | 功能描述:IC REG MULTI CONFIG SYNC 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3579EUFD#TRPBF | 功能描述:IC REG MULTI CONFIG SYNC 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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