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參數(shù)資料
| 型號： | ISL6741 |
| 廠商： | Intersil Corporation |
| 英文描述： | Flexible Double-Ended Voltage and Current Mode PWM Controllers |
| 中文描述： | 靈活的雙端電壓和電流模式PWM控制器 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大?。?/td> | 507K |
| 代理商： | ISL6741 |
17
However, a high rated ripple current capacitor was selected
based on the nature of the intended load, multiple buck
regulators. To minimize the output impedance of the filter, a
SANYO OSCON 16SH150M capacitor in parallel with a
22
μ
F ceramic capacitor were selected.
Over Current Component Selection
There are two circuit areas to consider when selecting the
components for over current protection, current limit and
short circuit shutdown. The current limit threshold is fixed at
0.6V while the short circuit threshold is set to a fraction of the
duty cycle the designer wishes to define as a short circuit.
The current level that corresponds to the over current
threshold must be chosen to allow for the dynamic behavior
of an open loop converter. In particular, the low inductor
ripple current under steady state operation increases
significantly as the duty cycle decreases.
Fig. 8 and 9 show the behavior of the inductor ripple under
steady state and over current conditions. In this example,
the peak current limit is set at 11A. The peak current limit
causes the duty cycle to decrease resulting in a reduction of
the average current through the inductor. The implication is
that the converter can not supply the same output current in
current limit that it can supply under steady state conditions.
The peak current limit setpoint must take this behavior into
consideration. A 3.32
current sense resistor was selected
for the rectified secondary of current transformer T2,
corresponding to a peak current limit setpoint of 16.5A.
The short circuit protection involves setting a voltage
between 0 and 2V on the SCSET pin. The applied voltage
divided by 2 is the percent of maximum duty cycle that
corresponds to a short circuit when the peak current limit is
active. A divider from RTC to ground provides an easy
method to achieve this. The divider between RTC and GND
formed by R13 and R15 determines the percent of maximum
duty cycle that corresponds to a short circuit. The divider
ratio formed by R13 and R15 is
Therefore, the duty cycle that corresponds to a short circuit
is 6.8% of D max (97.9%), or ~6.6%.
FIGURE 8. STEADY STATE SECONDARY WINDING
VOLTAGE AND INDUCTOR CURRENT
14
13
12
11
10
9
8
0.9950
0.9960
0.9970
0.9980
0.9990
1.000
TIME (ms)
V (L1:1)
I
(L1)
FIGURE 9. SECONDARY WINDING VOLTAGE AND
INDUCTOR CURRENT DURING CURRENT LIMIT
OPERATION
V (L1:1)
I
(L1)
0.986
0.988
0.990
0.992
0.994
1.000
TIME (ms)
0.996
0.998
15
10
5
R15
-------------+
17.4k
---------------+
0.068
=
=
(EQ. 24)
ISL6740, ISL6741
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6741IB | 功能描述:電流型 PWM 控制器 CUR PWM MODE CNTRLR 16LD N 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 |
| ISL6741IB-T | 功能描述:IC REG CTRLR PWM CM 16-SOIC RoHS:否 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| ISL6741IBZ | 功能描述:IC REG CTRLR PWM CM 16-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) |
| ISL6741IBZ-T | 功能描述:IC REG CTRLR PWM CM 16-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) |
| ISL6741IV | 功能描述:IC REG CTRLR PWM CM 16-TSSOP RoHS:否 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
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