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| 型号： | ISL6740IBZ |
| 厂商： | INTERSIL CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Flexible Double Ended Voltage and Current Mode PWM Controllers |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | ROHS COMPLIANT, PLASTIC, MS-012-AC, SOIC-16 |
| 文件页数： | 17/29页 |
| 文件大小： | 635K |
| 代理商： | ISL6740IBZ |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
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 fSW/4, where fSW 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 fLC/2, where fLC 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 fLC/5, and the second at just above fLC.
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
R23 = 9.53kΩ
R24 = 2.49kΩ
R4 = 499Ω
R21 = 4.22kΩ
C22 = 1nF
C20 = 82pF
C19 = 0.22μF
From (Equations 27, 28, 29 and 30), the poles and zeroes
are:
fz1 = 171Hz
fz2 = 16.7kHz
fp2 = 460kHz
fp3 = 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
A
IN
(
d
B)
10
100
1106
1105
1104
1103
FIGURE 22B. OPTO COUPLER
-90
-45
0
45
90
FREQUENCY (Hz)
P
H
A
S
E
(
D
EG
R
E
S
)
10
100
1106
1105
1104
1103
FIGURE 23A. IDEAL ERROR AMPLIFIER GAIN
-10
0
10
20
FREQUENCY (Hz)
GAI
N
(
d
B)
10
100
1106
1105
1104
1103
FIGURE 23B. IDEAL ERROR AMPLIFIER PHASE
-90
-45
0
45
90
FREQUENCY (Hz)
PHASE
(
°)
10
100
1106
1105
1104
1103
ISL6740, 1SL6741
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| ISL6740IBZ-T | 功能描述:IC REG CTRLR PWM VM 16-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) |
| ISL6740IV | 功能描述:IC REG CTRLR PWM VM 16-TSSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6740IV-T | 功能描述:IC REG CTRLR PWM VM 16-TSSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6740IVZ | 功能描述:电压模式 PWM 控制器 VOLT PWM MODE CONTRL 16LD TSSOP RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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