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| 型号： | LT3580MPMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV SEPIC 2A 8MSOP |
| 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： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
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LT3580
APPLICATIONS INFORMATION
Output Pole: P1 =
Error Amp Pole: P2 =
Error Amp Zero: Z1 =
? V C ? I ? V OUT ? V FB
( g ma ? R 0 ) ? g mp ? ? η ? V V IN
? R L ? 0.5R2
? ? ? R1 + 0.5R2
Compensation—Theory
Like all other current mode switching regulators, the
LT3580 needs to be compensated for stable and efficient
operation. Two feedback loops are used in the LT3580—
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 4 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power stage of the IC, inductor and diode have been replaced
by a combination of the equivalent transconductance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 VC voltage. η is the efficiency of the
From Figure 4, the DC gain, poles and zeros can be cal-
culated as follows:
2
2 ? π ? R L ? C OUT
1
2 ? π ? ?? R O + R C ?? ? C C
1
2 ? π ? R C ? C C
DC Gain:
(Breaking Loop at FB Pin)
A DC = A OL (0) = ? VIN ? ? =
? V FB ? V C ? I VIN ? V OUT
?
? OUT 2
switching regulator, and is typically about 88%.
Note that the maximum output currents of g mp and g ma are
finite. The limits for g mp are in the Electrical Characteristics
section (switch current limit), and g ma is nominally limited
to about ±12μA.
ESR Zero: Z2 =
RHP Zero: Z3 =
1
2 ? π ? R ESR ? C OUT
V IN 2 ? R L
2 ? π ? V OUT 2 ? L
g mp
I VIN
V OUT
High Frequency Pole: P3 >
f S
3
? V IN
V OUT
?I VIN
C PL
R ESR
C OUT
R L
Phase Lead Zero: Z4 =
1
2 ? π ? R1? C PL
C F
R C
C C
V C
R O
g ma
+
–
1.215V
REFERENCE
R2
R2
FB
R1
3580 F04
Phase Lead Pole: P4 =
2? π ?
1
R1?
R1 +
R2
2 ?C PL
R2
2
C C : COMPENSATION CAPACITOR
Error Amp Filter Pole:
2? π ? C
,C F < C
C OUT : OUTPUT CAPACITOR
C PL : PHASE LEAD CAPACITOR
C F : HIGH FREQUENCY FILTER CAPACITOR
g ma : TRANSCONDUCTANCE AMPLIFIER INSIDE IC
g mp : POWER STAGE TRANSCONDUCTANCE AMPLIFIER
R C : COMPENSATION RESISTOR
P5 =
1
R ?R O
R C +R O
? C F
C
10
R L : OUTPUT RESISTANCE DEFINED AS V OUT DIVIDED BY I LOAD(MAX)
R O : OUTPUT RESISTANCE OF g ma
R1, R2: FEEDBACK RESISTOR DIVIDER NETWORK
R ESR : OUTPUT CAPACITOR ESR
Figure 4. Boost Converter Equivalent Model
The current mode zero (Z3) is a right-half plane zero
which can be an issue in feedback control design, but is
manageable with proper external component selection.
3580fg
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3581 | 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 |
| LT3581EDE#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: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 |
| LT3581EDE#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 |
| LT3581EDE-PBF | 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 |
| LT3581EDE-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 |
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