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參數(shù)資料
| 型號： | ISL6401 |
| 廠商： | Intersil Corporation |
| 英文描述： | Synchronizing Current Mode PWM for Subscriber Line Interface Circuits (SLICs)(用戶線接口電路(SLICs)專用同步電流模式PWM) |
| 中文描述： | 同步電流模式PWM用戶線接口電路（SLIC）（用戶線接口電路（SLIC組件）專用同步電流模式脈寬調(diào)制） |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 330K |
| 代理商： | ISL6401 |
9
FN9007.7
April 13, 2005
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.
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.
ISL6401
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6401CB-T | Synchronizing Current Mode PWM for Subscriber Line Interface Circuits (SLICs) |
| ISL6401CB | Quadruple 2-Input Exclusive-OR Gates 14-SO -40 to 85 |
| ISL6401CBZ | Synchronizing Current Mode PWM for Subscriber Line Interface Circuits (SLICs) |
| ISL6401CR | Quadruple 2-Input Exclusive-OR Gates 14-TSSOP -40 to 85 |
| ISL6401CRZ | Quadruple 2-Input Exclusive-OR Gates 14-TSSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6401 WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6401CB | 功能描述:電流型 PWM 控制器 RSLIC PWM 0/+70C 14LD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6401CB-T | 功能描述:電流型 PWM 控制器 RSLIC PWM 0/+70C 14LD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| ISL6401CBZ | 功能描述:IC REG CTRLR PWM CM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:75 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.3 V ~ 13.5 V 降壓:是 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:0°C ~ 70°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:管件 產(chǎn)品目錄頁面:1051 (CN2011-ZH PDF) 其它名稱:296-2543-5 |
| ISL6401CBZ-T | 功能描述:IC REG CTRLR PWM CM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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