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参数资料
| 型号： | LT3580EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV SEPIC 2A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相，Sepic |
| 输出数： | 1 |
| 输入电压： | 2.5 V ~ 32 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
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LT3580
APPLICATIONS INFORMATION
these materials retain their capacitance over wider voltage
and temperature ranges. A 4.7μF to 20μF output capaci-
tor is sufficient for most applications, but systems with
very low output currents may need only a 1μF or 2.2μF
output capacitor. Always use a capacitor with a sufficient
voltage rating. Many capacitors rated at 2.2μF to 20μF,
particularly 0805 or 0603 case sizes, have greatly reduced
capacitance at the desired output voltage. Solid tantalum
or OS-CON capacitors can be used, but they will occupy
more board area than a ceramic and will have a higher
ESR with greater output ripple.
Ceramic capacitors also make a good choice for the input
decoupling capacitor, which should be placed as closely as
possible to the LT3580. A 2.2μF to 4.7μF input capacitor
is sufficient for most applications.
Table 2 shows a list of several ceramic capacitor manufac-
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
Table 2. Ceramic Capacitor Manufacturers
Kemet www.kemet.com
Compensation—Adjustment
To compensate the feedback loop of the LT3580, a series
resistor-capacitor network in parallel with a single capacitor
should be connected from the VC pin to GND. For most
applications, the series capacitor should be in the range
of 470pF to 2.2nF with 1nF being a good starting value.
The parallel capacitor should range in value from 10pF to
100pF with 47pF a good starting value. The compensation
resistor, R C , is usually in the range of 5k to 50k. A good
technique to compensate a new application is to use a
100k Ω potentiometer in place of series resistor R C . With
the series capacitor and parallel capacitor at 1nF and 47pF
respectively, adjust the potentiometer while observing the
transient response and the optimum value for R C can be
found. Figures 3a to 3c illustrate this process for the circuit
of Figure 14 with a load current stepped between 400mA
and 500mA. Figure 3a shows the transient response with
R C equal to 1k. The phase margin is poor, as evidenced by
the excessive ringing in the output voltage and inductor
current. In Figure 3b, the value of R C is increased to 3k,
which results in a more damped response. Figure 3c
Murata
Taiyo Yuden
V OUT
200mV/DIV
AC COUPLED
I L
0.5A/DIV
www.murata.com
www.t-yuden.com
shows the results when R C is increased further to 10k. The
transient response is nicely damped and the compensation
procedure is complete.
V OUT
200mV/DIV
AC COUPLED
I L
0.5A/DIV
R C = 1k
200μs/DIV
3580 F03a
R C = 3k
200μs/DIV
3580 F03b
Figure 3a. Transient Response Shows Excessive Ringing
V OUT
200mV/DIV
AC COUPLED
I L
0.5A/DIV
Figure 3b. Transient Response Is Better
R C = 10k
200μs/DIV
3580 F03c
Figure 3c. Transient Response Is Well Damped
3580fg
10
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相关代理商/技术参数 |
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|---|---|
| LT3580EMS8E | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization |
| LT3580EMS8E#PBF | 功能描述:IC REG BOOST INV SEPIC 2A 8MSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3580EMS8E#PBF | 制造商:Linear Technology 功能描述:Switching Regulator IC 制造商:Linear Technology 功能描述:IC BOOST/INVERTING DC/DC CONVERTER MSOP8 |
| LT3580EMS8E#TRPBF | 功能描述:IC REG BOOST INV SEPIC 2A 8MSOP 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT3580EMS8EPBF | 制造商:Linear Technology 功能描述:2A Boost/Inverting switch,sync LT3580 |
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