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參數資料
| 型號： | IRS2548DSPBF |
| 廠商： | International Rectifier |
| 文件頁數： | 17/22頁 |
| 文件大小： | 320K |
| 描述： | IC PFC |
| 特色產品： | IRS2548D LED Driver |
| 標準包裝： | 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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相關代理商/技術參數 |
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|---|---|
| IRS2548DSPBF | 制造商:International Rectifier 功能描述:IC LED DRVR SOIC |
| IRS2548DSTRPBF | 功能描述:LED照明驅動器 PFC + Hlf Brdg Combo LED Drvr IC RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| IRS2552D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CCFL/EEFL BALLAST CONTROLLER IC |
| IRS2552DPBF | 功能描述:功率驅動器IC CCFL / EEFL Ballast Cntrl IC RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IRS2552DSPBF | 功能描述:功率驅動器IC CCFL / EEFL BALLAST 600V CTRL 300mA RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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