参数资料
型号: LT3579EFE#PBF
厂商: Linear Technology
文件页数: 25/40页
文件大小: 0K
描述: IC REG MULTI CONFIG SYNC 20TSSOP
标准包装: 74
类型: 升压(升压),反相,回扫,Sepic
输出数: 1
输入电压: 2.5 V ~ 16 V
PWM 型: 电流模式
频率 - 开关: 200kHz ~ 2.5MHz
电流 - 输出: 6A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)裸露焊盘
包装: 管件
供应商设备封装: 20-TSSOP-EP
LT3579/LT3579-1
APPENDIX
DC ? ( V IN ? V CESAT ) Boost
V OUT ? I OUT ? Topology
L BOOST >
2 ? f OSC ? ? I PK
?
DC ? ( V IN ? V CESAT )
L DUAL >
2 ? f OSC ? ? I PK ? OUT
? I OUT ? Topologies
( V IN ? V CESAT ) ? ( 2 ? DC ? 1 )
4A ? f OSC ? ( 1 ? DC )
Table 5. Inductor Manufacturers
Vishay IHLP-2020BZ-01 and www.vishay.com
IHLP-2525CZ-01 Series
Coilcraft XLP, MLC and MSS Series www.coilcraft.com
Cooper Bussmann DRQ125 and DRQ127 www.cooperbussmann.
Series com
Sumida CDRH series www.sumida.com
TDK RLF and SLF series www.tdk.com
Würth WE-PD, WE-PDF, WE-HC www.we-online.com
and WE-DD Series
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
conditions that limit the minimum inductance; (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
Small value inductors result in increased ripple currents and
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:
?
?
? V IN ? η ?
or
SEPIC
or
? |V  | ? I OUT ? Inverting
? V IN ?η ?
where:
L BOOST = L1 for Boost Topologies (see Figure 6)
L DUAL = L1 = L2 for Coupled Dual Inductor
Topologies (see Figures 7 and 8)
L DUAL = L1 || L2 for Uncoupled Dual Inductor
Topologies (see Figures 7 and 8)
DC = Switch Duty Cycle (see Power Switch Duty
Cycle section in Appendix)
I PK = 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)
f OSC = Switching Frequency
I OUT = Maximum Output Current
Negative values of L BOOST or L DUAL indicate that the
output load current, I OUT , 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:
L MIN =
where:
L MIN = L1 for Boost Topologies (see Figure 6)
L MIN = L1 = L2 for Coupled Dual Inductor
Topologies (see Figures 7 and 8)
L MIN = L1 || L2 for Uncoupled Dual Inductor
Topologies (see Figures 7 and 8)
35791f
25
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