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| 型号： | ISL6401CB |
| 厂商： | Intersil |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 14-SOIC |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 50% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 无 |
| 升压： | 是 |
| 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 ~ 85°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 产品目录页面： | 1243 (CN2011-ZH PDF) |
ISL6401
Primary Inductance
The flyback transformer is actually a coupled inductor, acting
as an energy storage unit, as well as performing the usual
transformer functions. Crucial considerations include primary
inductance, working flux density swing, gap length, the
winding scheme and wire diameter. The primary inductance,
LP, for a discontinuous mode flyback converter can be
calculated according to the following relationship:
Lp = n [(V INmin - V DS )(T ONmax )] 2 / (2)(T)(V OUT )(I OUT )
Where n is the assumed efficiency of the converter and Iout
is the output current. The ferrite core should have high
saturation, low residual flux density, and low losses. An
EFD15 core material proved to be suitable for this
application.
Current Sense
The ground referenced sense resistor is selected such that
the maximum peak primary current trips the CS pin threshold
when this current is 10% higher than its normal operating
peak value at the minimum input voltage.
9
This limits the peak primary current in the event of an output
short circuit. This resistor must have a power rating to meet
the (I 2rms )(R) requirement, where I rms is the root mean
square (rms) primary current. Because this resistor defines
the maximum peak primary current, the input energy to the
transformer is defined and equal to (L P )(I 2PEAK ) / 2. This
defined energy in a fixed frequency discontinuous-mode
flyback results in a fixed output power.
The advantage of current-mode control is that the output
voltage is held constant despite changes in the input voltage,
because the peak-primary current remains constant; the
slope of this inductor current and its pulse width are
adjusted. Leading edge spikes or noise are caused by the
reverse recovery of the rectifier, equivalent capacitive
loading on the secondary, and parasitic circuit inductances.
A small low pass RC filter is added to the current-sense
signal to filter out these spikes, so the comparator does not
assume an overload condition is present during switch turn-
on. To avoid excessive phase lag on the current-sense
signal, the low pass filter corner frequency is selected to be
at least a decade above the switching frequency.
FN9007.7
April 13, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6401CB-T | 功能描述:电流型 PWM 控制器 RSLIC PWM 0/+70C 14LD RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6401CBZ | 功能描述:IC REG CTRLR PWM CM 14-SOIC 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:75 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.3 V ~ 13.5 V 降压:是 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:0°C ~ 70°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:管件 产品目录页面:1051 (CN2011-ZH PDF) 其它名称:296-2543-5 |
| ISL6401CBZ-T | 功能描述:IC REG CTRLR PWM CM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6401CR | 功能描述:IC REG CTRLR BST FLYBK ISO 16QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6401CR-T | 功能描述:IC REG CTRLR BST FLYBK ISO 16QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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