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| 型号： | LT1425IS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBK ISOLATED .2A 16SOIC |
| 标准包装： | 50 |
| 类型： | 回扫，隔离 |
| 输出数： | 1 |
| 输入电压： | 2.8 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 285kHz |
| 电流 - 输出： | 200mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
LT1425
OPERATIO N
may be minimized by the use of the load compensation
function.
external R OCOMP resistor to form a current that is
subtracted from the R FB node. So the effective change in
To implement the load compensation function, a voltage is
developed that is proportional to average output switch
current. This voltage is then impressed across the external
R OCOMP resistor and the resulting current is then sub-
V OUT target is:
? V OUT = K1( ? I OUT )
)
(R SENSE )(G)
R OCOMP
)
R FB
) ) ) )
? V RCCOMP R FB
? I SW
R OCOMP
) ) ) )
? V RCCOMP R FB
? I SW
R OUT
) )
I IN = I OUT
)
)
? I SW
) ) ) )
? V OUT ? V RCCOMP R FB
? I OUT
? I SW
tracted from the R FB node. As output loading increases,
average switch current increases to maintain rough output
voltage regulation. This causes an increase in R OCOMP
resistor current subtracted from the R FB node, through
which feedback loop action causes a corresponding
increase in target output voltage.
Assuming a relatively fixed power supply efficiency, Eff,
Power Out = (Eff)(Power In)
(V OUT )(I OUT ) = (Eff)(V IN )(I IN )
Average primary side current may be expressed in terms
of output current as follows:
V OUT
(V IN )(Eff)
Combining the efficiency and voltage terms in a single
variable,
I IN = K1(I OUT )
Expressing the product of R SENSE and G as the data sheet
value of ? V RCCOMP / ? I SW ,
R OUT = K1 and,
R OCOMP = K1
where,
K1 = Dimensionless variable related to V IN ,
V OUT and efficiency as above
? V RCCOMP
= Data sheet value for R CCOMP pin
action vs switch current
R FB = External “feedback” resistor value
R OUT = Uncompensated output impedance
= K1
R OCOMP
)
V OUT
where,
K1 =
(V IN )(Eff)
)
Nominal output impedance cancellation is obtained by
equating this expression with R OUT . The practical aspects
of applying this equation to determine an appropriate
value for the R OCOMP resistor are found in the Applications
Switch current is converted to voltage by a sense resistor
and amplified by the current sense amplifier with associ-
ated gain G. This voltage is then impressed across the
10
Information section.
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| LT1431CN8 | 功能描述:IC VREF SHUNT ADJ 8-PDIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
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