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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： | 21/40页 |
| 文件大小： | 503K |
| 代理商： | LT3579EFE-1#PBF |
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LT3579/LT3579-1
28
35791f
appenDix
Table 7 shows a list of several discrete PMOS manufa-
cturers.Consultthemanufacturersfordetailedinformation
on their entire selection of PMOS devices.
Table 7. Discrete PMOS Manufacturers
Vishay
www.vishay.com
Fairchild Semiconductor
www.fairchildsemi.com
Central Semiconductor
www.centralsemi.com
COMPENSATION – ADJUSTMENT
To compensate the feedback loop of the LT3579, a series
resistor-capacitornetworkinparallelwithanoptionalsingle
capacitor must be connected from the VC pin to GND. For
most applications, choose a series capacitor in the range
of 1nF to 10nF with 2.2nF being a good starting value.
The optional parallel capacitor should range in value from
22pF to 180pF with 47pF being a good starting value. The
compensation resistor, RC, is usually in the range of 5k to
50k. A good technique to compensate a new application is
tousea100kΩpotentiometerinplaceoftheseriesresistor
RC. With the series and parallel capacitors at 2.2nF and
47pFrespectively,adjustthepotentiometerwhileobserving
the transient response and the optimum value for RC can
be found. Figures 17a to 17c illustrate this process for the
circuit of Figure 20 with a load current stepped between
0.7A and 1.5A. Figure 17a shows the transient response
withRCequalto1k.Thephasemarginispoorasevidenced
by the excessive ringing in the output voltage and inductor
current. In Figure 17b, the value of RC is increased to 3.5k,
which results in a more damped response. Figure 17c
shows the results when RC is increased further to 8k. The
transientresponseisnicelydampedandthecompensation
procedure is complete.
COMPENSATION – THEORY
Like all other current mode switching regulators, the
LT3579 needs to be compensated for stable and efficient
operation. Two feedback loops are used in the LT3579: a
fast current loop which does not require compensation,
and a slower voltage loop which does. Standard Bode plot
analysis can be used to understand and adjust the voltage
feedback loop.
Figure 17a. Transient Response Shows Excessive Ringing
Figure 17b. Transient Response Is Better
Figure 17c. Transient Response Is Well Damped
100s/DIV
VOUT
500mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
1A/DIV
35791 F17a
RC = 1k
100s/DIV
VOUT
500mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
1A/DIV
35791 F17b
RC = 3.5k
100s/DIV
VOUT
500mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
1A/DIV
35791 F17c
RC = 8k
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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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