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參數(shù)資料
| 型號： | IRS2548DSPBF |
| 廠商： | International Rectifier |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 320K |
| 描述： | IC PFC |
| 特色產(chǎn)品： | IRS2548D LED Driver |
| 標準包裝： | 55 |
| 系列： | * |
IRS2548D
www.irf.com
?2011 International Rectifier
14
Run Mode (RUN)
After the VCC supply comes up and the IC starts,
the IC enters run mode. The operating frequency is
set to the minimum limit, which is programmed by
the external resistor (RFMIN) at the FMIN pin. If the
IRS2548D is used in a series resonant
configuration the frequency can be increased to
regulate the system output voltage. This can be
implemented by sinking additional current from the
FMIN pin with an additional resistor, opto isolator or
other arrangement.
It should be noted that the FMIN pin input is very
sensitive to noise and that traces connected to this
pin should be very short and should be kept away
from high voltage switching nodes; HO, VB and VS.
An additional RC filter can also be added to the
FMIN pin if necessary as shown in the application
schematic on page 1.
Should hard-switching occur at the half-bridge at
any time or excessive current be drawn due to a
fault condition, the voltage across the current
sensing resistor (RCS) will exceed the internal
threshold of 1.2 volts (VCSTH+) and the fault
counter will begin counting (see Figure 3).
CS Fault Mode
The current sense function will force the IC to enter
fault mode only after the voltage at the CS pin has
been greater than 1.2V (VCSTH+) for 65
(nEVENTS) consecutive cycles of LO. The voltage
at the CS pin is AND-ed with LO (see Figure 3) so it
will work with pulses that occur during the LO on-
time or DC. If the over-current faults are not
consecutive, then the internal fault counter will
count back down each cycle when there is no fault.
Should an over-current fault occur only for a few
cycles and then not occur again, the counter will
eventually reset to zero.
LO
CS
65 Cycles
Run Mode
Fault Mode
1.25V
Figure 3: Fault counter timing diagram.
DIM Mode (ENN Input)
PWM dimming can be implemented via the ENN pin.
If the voltage input to the ENN pin exceeds 2V during
run mode, the IC enters dim mode, LO, HO and PFC
gate drivers go to the low state. This is similar to fault
mode except that the COMP pin is not internally
pulled to COM and so the COMP capacitor retains it's
voltage. This allows the PFC to start up rapidly with
the on time close to where it was before the ENN
signal shut off the IC outputs. When ENN goes below
1.5V and therefore the bus voltage can be maintained
while the PFC gate drive being held low during the
periods where the LED load is not being driven. This
minimizes ripple generated on the DC bus during
PWM dimming.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRS2548DSPBF | 制造商:International Rectifier 功能描述:IC LED DRVR SOIC |
| IRS2548DSTRPBF | 功能描述:LED照明驅(qū)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(fēng)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(qū)動器IC CCFL / EEFL Ballast Cntrl IC RoHS:否 制造商:Micrel 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IRS2552DSPBF | 功能描述:功率驅(qū)動器IC CCFL / EEFL BALLAST 600V CTRL 300mA RoHS:否 制造商:Micrel 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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