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参数资料
| 型号： | LT1508ISW#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | POWER FACTOR CONTROLLER WITH POST REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | 0.300 INCH, PLASTIC, SO-20 |
| 文件页数： | 4/16页 |
| 文件大小： | 300K |
| 代理商： | LT1508ISW#TR |
12
LT1508
The total equivalent 120Hz ripple in the output capacitor
can be calculated by:
IHF
1.43
IRMS =I120HZ2 +
()2
IHF = 100kHz Ripple Current.
For ILOAD(DC) = 0.88A, 1120Hz = 0.62A and the equivalent
120Hz ripple current is:
1.79
1.43
IRMS =
= 1.4ARMS
0.622 +
()2
Table 1 lists the ripple current components from lab
measurements for various output powers and line volt-
ages. The 120Hz ripple current rating at 105
°C ambient is
1.72A for the 470
F KMH 35mm × 50mm capacitor. The
expected life of the output capacitor may be calculated
from thermal stress analysis:
(105
°C + TK) – (TA + TO)
10
L = (LO)2
where
L = Expected life time
LO = Hours of load life at rated ripple current and rated
ambient temperature
TK = Capacitor internal temperature rise at rated
condition.
TK = (I2R)/(KA), where I is the rated cur-
rent, R is capacitor ESR and KA is a volume constant.
TA = Operating ambient temperature
TO = Capacitor internal temperature rise at operating
condition
APPLICATIONS INFORMATION
WU
U
Table 1. PFC Capacitor RMS Ripple Current
100W
200W
300W
VINRMS
I120HZ
IHF
I120HZ
IHF
I120HZ
IHF
100
0.2
0.6
0.41
1.18
0.62
1.79
120
0.2
0.5
0.41
0.97
0.62
1.45
230
0.2
0.53
0.41
0.87
0.62
1.26
In our example, LO = 2000 hours assuming TK = 5°C at
rated 1.72A.
TO can then be calculated from:
IRMS
1.72A
TO = TK
= 5
°C
()2 1.4A =3.3°C
1.72A
()2
Assuming the operating ambient temperature is 60
°C, the
approximate lifetime is:
(105
°C + 5°C) – (60 + 3.3°C)
10
L = (2000)(2)
= 50,870 Hours
For longer life a capacitor with a higher ripple current rating
or parallel capacitors should be used.
PWM Comparators
The LT1508 includes two comparators in the PWM section
which implement voltage mode PWM control. The VC or
control voltage pin sets duty factor. An additional current
limit comparator turns GTDR2 off in the event the ILIM pin
voltage exceeds 1.1V. On-chip blanking avoids reset due
to leading edge noise.
Typical Application
Figure 9 shows a 24VDC, 300W power factor corrected,
universal input supply. The 2-transistor forward converter
offers many benefits including low peak currents,
nondissipative snubber, 500VDC switches and automatic
core reset guaranteed by the LT1508’s 50% maximum
duty cycle.
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相关代理商/技术参数 |
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| LT1509 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Factor and PWM Controller |
| LT15090 | 制造商:Cooper Crouse-Hinds 功能描述: 制造商:CROUSE-HINDS/COOPER 功能描述: |
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| LT1509CN#PBF | 功能描述:IC PFC CTRLR AVERAGE CURR 20DIP RoHS:是 类别:集成电路 (IC) >> PMIC - PFC（功率因数修正） 系列:- 产品培训模块:GreenChip Synchronous Rectification Control Family of ICs 标准包装:1 系列:- 模式:间歇导电（DCM） 频率 - 开关:- 电流 - 启动:- 电源电压:8.6 V ~ 38 V 工作温度:-20°C ~ 150°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:Digi-Reel® 其它名称:568-5348-6 |
| LT1509CSW | 功能描述:IC PFC CTRLR AVERAGE CURR 20SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - PFC（功率因数修正） 系列:- 产品培训模块:GreenChip Synchronous Rectification Control Family of ICs 标准包装:1 系列:- 模式:间歇导电（DCM） 频率 - 开关:- 电流 - 启动:- 电源电压:8.6 V ~ 38 V 工作温度:-20°C ~ 150°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:Digi-Reel® 其它名称:568-5348-6 |
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