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参数资料
| 型号： | LT3837EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 88% |
| 电源电压： | 4.5 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LT3837
OPERATION
V FLBK
T1
Average primary side current is expressed in terms of
output current as follows:
V OUT
V IN ? Eff
? V OUT = K1 ? ? I OUT ?
? R1 ? N SF
R1
R2
FB
8
LOAD
COMP I
Q3
Q1 Q2
A1
V FB
+
–
R CMPF
50k
V IN
SENSE +
12
?
?
MP
?
I IN = K1 ? I OUT
where:
K1 =
So the effective change in V OUT target is:
R SENSE
R CMP
= K1 ? SENSE ? R1 ? N SF
14 R CMP
13 C CMP
R SENSE
3837 F01
thus:
? V OUT
? I OUT
R
R CMP
? R1 ? N SF =
R SENSE ESR + R DS(ON)
R SENSE ? ( 1–DC )
ESR + R DS(ON)
Figure1.LoadCompensationDiagram
Figure 1 shows the block diagram of the load compensa-
tion function. Switch current is converted to voltage by the
external sense resistor, averaged and lowpass filtered by
the internal 50k resistor R CMPF and the external capacitor
on C CMP . This voltage is then impressed across the exter-
nal R CMP resistor by op amp A1 and transistor Q3. This
produces a current at the collector of Q3 that is subtracted
from the FB node. This action effectively increases the
voltage required at the top of the R1/R2 feedback divider
to achieve equilibrium.
The average primary side switch current increases to
maintain output voltage regulation as output loading
increases. The increase in average current increases
the R CMP resistor current which affects a corresponding
increase in sensed output voltage, compensating for the
IR drops.
where:
K1 = dimensionless variable related to V IN , V OUT and
efficiency as explained above
R SENSE = external sense resistor
Nominal output impedance cancellation is obtained by
equating this expression with R S(OUT) :
K1 ?
R CMP 1–DC
Solving for R CMP gives:
R CMP = K1 ? ? R1 ? N SF
The practical aspects of applying this equation to determine
an appropriate value for the R CMP resistor are found in the
Applications Information section.
Assuming a relatively fixed power supply efficiency, Eff,
power balance gives:
P OUT = Eff ? P IN
V OUT ? I OUT = Eff ? V IN ? I IN
3837fd
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3837IFE#PBF | 功能描述:IC REG CTRLR FLYBK ISO 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT3837IFE#TRPBF | 功能描述:IC REG CTRLR FLYBK ISO 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT383L313 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LT3844 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency |
| LT3844EFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency |
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