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参数资料
| 型号： | IRS2548DSPBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/22页 |
| 文件大小： | 320K |
| 描述： | IC PFC |
| 特色产品： | IRS2548D LED Driver |
| 标准包装： | 55 |
| 系列： | * |
IRS2548D
www.irf.com
?2011 International Rectifier
17
0
0
I
LPFC
PFC
pin
near peak region of
rectified AC line
near zero-crossing region
of rectified AC line
Figure 9: On-time modulation circuit timing diagram
DC Bus Over-voltage Protection
Should over-voltage occur on the DC bus and the
VBUS pin exceeds the internal 4.3V threshold
(VBUSOV+), the PFC output is disabled (set to a
logic low). When the DC bus decreases again
and the VBUS pin decreases below the internal
4.15V threshold (VBUSOV-), a watch-dog pulse is
forced on the PFC pin and normal PFC operation
is resumed.
III. Design Equations (Half-Bridge)
Note: The results from the following design equations
can differ slightly from actual measurements due to IC
tolerances, component tolerances, and oscillator over-
and under-shoot due to internal comparator response
time.
Step 1: Program Run Frequency
The run frequency is programmed with the timing
resistor RFMIN at the FMIN pin.
The graph in Figure 10 (RFMIN vs. Frequency) can be
used to select RFMIN value for desired run frequency.
20
40
60
80
100
120
140
160
180
10
15
20
25
30
35
40
45
50
Equivalent RFMIN (Kohms)
Figure 10: Graph of frequency against RFMIN
Step 2: Program Maximum Current
The maximum current is programmed with the external
resistor RCS and an internal threshold of 1.25V
(VCSTH+). This threshold determines the over-current
limit of the system:
CS
MAX
R
I
25
.
1
=
[Amps Peak]
or
MAX
CS
I
R
25
.
1
=
[Ohms]
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRS2548DSPBF | 制造商:International Rectifier 功能描述:IC LED DRVR SOIC |
| IRS2548DSTRPBF | 功能描述:LED照明驱动器 PFC + Hlf Brdg Combo LED Drvr IC RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| IRS2552D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CCFL/EEFL BALLAST CONTROLLER IC |
| IRS2552DPBF | 功能描述:功率驱动器IC CCFL / EEFL Ballast Cntrl IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IRS2552DSPBF | 功能描述:功率驱动器IC CCFL / EEFL BALLAST 600V CTRL 300mA RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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