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| 型号： | LT3581EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 26/36页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 16MSOP |
| 标准包装： | 37 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.22 V ~ 42 V |
| 输入电压： | 2.5 V ~ 22 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 3.3A |
| 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： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
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LT3581
APPENDIX
50μs/DIV
found. Figures 15a to 15c illustrate this process for the
circuit of Figure 18 with a load current stepped between
540mA and 800mA. Figure 15a shows the transient re-
sponse 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 15b, the value of R C is
increased to 3k, which results in a more damped response.
Figure 15c shows the results when R C is increased further
to 10.5k. The transient response is nicely damped and the
compensation procedure is complete.
V OUT
AC-COUPLED
500mV/DIV
I L
1A/DIV
3581 F15a
Figure 15a. Transient Response Shows Excessive Ringing
V OUT
AC-COUPLED
500mV/DIV
COMPENSATION – THEORY
Like all other current mode switching regulators, the LT3581
needs to be compensated for stable and efficient operation.
Two feedback loops are used in the LT3581: 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.
As with any feedback loop, identifying the gain and
phase contribution of the various elements in the loop
is critical. Figure 16 shows the key equivalent elements
of a boost converter. Because of the fast current control
loop, the power stage of the IC, inductor and diode
have been replaced by a combination of the equivalent
transconductance amplifier g mp and the current controlled
current source (which converts I VIN to η V IN /V OUT ? I VIN ).
g mp acts as a current source where the peak input current,
I VIN , is proportional to the V C voltage. η is the efficiency
of the switching regulator and is typically about 80%.
Note that the maximum output currents of the g mp and
g ma stages are finite. The output of the g mp stage is
limited by the minimum switch current limit (see Electrical
Specifications) and the output of the g ma stage is nominally
limited to about ±12μA.
I L
1A/DIV
g mp
I VIN
η ? V IN
V OUT
? I VIN
V OUT
R ESR
R L
50μs/DIV
3581 F15b
C OUT
Figure 15b. Transient Response is Better
V C
g ma
+
1.215V
REFERENCE
R2
C PL
R1
V OUT
AC-COUPLED
500mV/DIV
C F
R C
C C
R O
–
R2
FB
3581 F16
50μs/DIV
I L
1A/DIV
3581 F15c
Figure 15c. Transient Response is Well Damped
C C : COMPENSATION CAPACITOR
C OUT : OUTPUT CAPACITOR
C PL : PHASE LEAD CAPACITOR
C F : HIGH FREQUENCY FILTER CAPACITOR
g ma : TRANSCONDUCTOR AMPLIFIER INSIDE IC
g mp : POWER STAGE TRANSCONDUCTANCE AMPLIFIER
R C : COMPENSATION RESISTOR
R L : OUTPUT RESISTANCE DEFINED AS V OUT /I LOAD(MAX)
R O : OUTPUT RESISTANCE OF g ma
R1, R2; FEEDBACK RESISTOR DIVIDER NETWORK
R ESR : OUTPUT CAPACITOR ESR
Figure 16. Boost Converter Equivalent Model
3581fa
26
For more information www.linear.com/LT3581
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3581EMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581HDE#PBF | 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ 14DFN |
| LT3581HDE#TRPBF | 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ 14DFN |
| LT3581IDE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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 |
| LT3581IDE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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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