參數(shù)資料
型號(hào)： ISL6741
廠商： Intersil Corporation
英文描述： Flexible Double Ended Voltage and Current Mode PWM Controllers(靈活的雙端電壓和電流模式PWM控制器)
中文描述： 靈活的雙端電壓和電流模式PWM控制器（靈活的雙端電壓和電流模式的PWM控制器）
文件頁(yè)數(shù)： 24/29頁(yè)
文件大?。?/td> 635K
代理商： ISL6741
24
FN9111.4
July 13, 2007
The higher the desired bandwidth of the converter, the more
difficult it is to create a solution that is stable over the entire
operating range. A good rule of thumb is to limit the
bandwidth to about f
SW
/4, where f
SW
is the switching
frequency of the converter. However, due to the bandwidth
constraints of the opto-coupler and the LM431 shunt
regulator, the bandwidth was reduced to about 25kHz.
The first pole is placed at the origin by default (C20 is an
integrating capacitor). If the two zeroes are placed at the
same frequency, they should be placed at f
LC
/2, where f
LC
is
the resonant frequency of the output L-C filter. To reduce the
gain peaking at the L-C resonant frequency, the two zeroes
are often separated. When they are separated, the first zero
may be placed at f
LC
/5, and the second at just above f
LC
.
The second pole is placed at the lowest expected zero
cause by the output capacitor ESR. The third, and last pole
is placed at about 1.5 times the cross over frequency.
Some liberties where taken with the generally accepted
compensation procedure described above due to the
transfer characteristics of the opto coupler. The effects of the
opto-coupler tend to dominate over those of the LM431 so
the GBWP effects of the LM431 are not included here.
The gain and phase characteristics of the opto coupler are
shown in Figure 22A.
The following compensation components were selected
R
23
= 9.53k
Ω
R
24
= 2.49k
Ω
R
4
= 499
Ω
R
21
= 4.22k
Ω
C
22
= 1nF
C
20
= 82pF
C
19
= 0.22
μ
F
From (Equations 27, 28, 29 and 30), the poles and zeroes
are:
f
z1
= 171Hz
f
z2
= 16.7kHz
f
p2
= 460kHz
f
p3
= 319kHz
The calculated gain and phase plots of the error amplifier
appear below using an ideal op amp.
FIGURE 22A. OPTO COUPLER GAIN
-20
-15
-10
-5
0
5
10
FREQUENCY (Hz)
G
10
100
110
6
110
5
110
4
110
3
FIGURE 22B. OPTO COUPLER
-90
-45
0
45
90
FREQUENCY (Hz)
P
10
100
110
6
110
5
110
4
110
3
FIGURE 23A. IDEAL ERROR AMPLIFIER GAIN
-10
0
10
20
FREQUENCY (Hz)
G
10
100
110
6
110
5
110
4
110
3
FIGURE 23B. IDEAL ERROR AMPLIFIER PHASE
-90
-45
0
45
90
FREQUENCY (Hz)
P
10
100
110
6
110
5
110
4
110
3
ISL6740, 1SL6741
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ISL6845IB Improved Industry Standard Single Ended Current Mode PWM Controller
ISL6845 Improved Industry Standard Single Ended Current Mode PWM Controller
ISL6845IRZ-T Improved Industry Standard Single-Ended Current Mode PWM Controller
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ISL6845IBZ Improved Industry Standard Single-Ended Current Mode PWM Controller
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(shí)間: 下降時(shí)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(biāo)準(zhǔn)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(yè)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(biāo)準(zhǔn)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(biāo)準(zhǔn)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(biāo)準(zhǔn)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(yè)面:1316 (CN2011-ZH PDF)
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