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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： | 22/40页 |
| 文件大小： | 503K |
| 代理商： | LT3579EFE-1#PBF |
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LT3579/LT3579-1
29
35791f
As with any feedback loop, identifying the gain and phase
contribution of the various elements in the loop is critical.
Figure 18 shows the key equivalent elements of a boost
converter. Because of the fast current control loop, the
powerstageoftheIC,inductoranddiodehavebeenreplaced
by a combination of the equivalent transconductance
amplifier gmp and the current controlled current source
(which converts IVIN to ηVIN
VOUT
IVIN ). Gmp acts as a current
source where the peak input current, IVIN, is proportional
to the VC voltage.
appenDix
1.215V
REFERENCE
IVIN
η VIN
VOUT
IVIN
VOUT
COUT
CPL
RESR
RL
RO
RC
CC
CF
R1
FB
R2
–
+
–
+
35791 F18
gmp
gma
CC: COMPENSATION CAPACITOR
COUT: OUTPUT CAPACITOR
CPL: PHASE LEAD CAPACITOR
CF: HIGH FREQUENCY FILTER CAPACITOR
gma: TRANSCONDUCTOR AMPLIFIER INSIDE IC
gmp: POWER STAGE TRANSCONDUCTANCE AMPLIFIER
RC: COMPENSATION RESISTOR
RL: OUTPUT RESISTANCE DEFINED AS VOUT/ILOADMAX
RO: OUTPUT RESISTANCE OF gma
R1, R2; FEEDBACK RESISTOR DIVIDER NETWORK
RESR: OUTPUT CAPACITOR ESR
η: CONVERTER EFFICIENCY (~90% AT HIGHER CURRENTS)
Figure 18. Boost Converter Equivalent Model
Note that the maximum output currents of gmp and gma
are finite. The output of the gmp stage is limited by the
minimumswitchcurrentlimit(seeElectricalSpecifications)
and gma is nominally limited to about ±12μA.
From Figure 18, the DC gain, poles and zeros can be
calculated as follows:
DC Gain:
ADC = gma RO gmp η
VIN
VOUT
RL
2
0.5R2
R1+0.5R2
Output Pole: P1
=
2
πRL COUT
Error Amp Pole: P2
=
1
2
π RO +RC
(
)CC
Error Amp Zero: Z1
=
1
2
πRC CC
ESR Zero: Z2
=
1
2
πRESR COUT
RHP Zero: Z3
=
VIN 2RL
2
πVOUT 2L
High Frequency Pole: P3
>
fS
3
Phase Lead Zero: Z4
=
1
2
πR1CPL
Phase Lead Pole: P4
=
1
2
π
R10.5R2
R1+0.5R2
CPL
Error Amp Filter Pole:
P5
=
1
2
π
RC RO
RC +RO
CF
, CF <
CC
10
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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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