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参数资料
| 型号： | IRS2552DSPBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | IC BALLAST CTLR CCFL/EEFL 16SOIC |
| 标准包装： | 45 |
| 类型： | CCFL/EEFL 控制器 |
| 频率： | 39 ~ 69 kHz |
| 电流 - 电源： | 10mA |
| 电流 - 输出： | 450mA |
| 电源电压： | 10.6 V ~ 15.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 管件 |
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IRS2552D
to F MIN , therefore applying maximum power to the lamps. At this point the burst mode dimming function will be
enabled.
Run Mode
In RUN mode an additional current source ICR_RUN is also switched into the circuit. This causes C R to ramp up
to V CR+ much more rapidly than before. The C R pin is used to provide ignition timing as well as the burst mode
dimming low frequency ramp.
If the output is open circuit a very large voltage develops at the output. This is fed back to the SD pin through
some suitable isolated sensing network such that the voltage at the SD pin will exceed VSDTH during an over-
voltage condition. At this stage the capacitor C D begins to charge through a current source. When VSD >
VSDTH the burst mode dimming function is disabled and the output will be continuous.
If the voltage at SD drops below VSDTH the capacitor C D will be discharged to 0V again. If SD remains above
VSDTH long enough for the C D capacitor voltage to reach VCDMAX or about 5 V then the IRS2552D will shut
down and go into fault mode.
Lamp Current Control
Additionally the half bridge current is monitored at the CS pin so that during running if too much power is
supplied to the lamps the IRS2552D is able to compensate by reducing the oscillator duty cycle while
maintaining the same run frequency. This prevents the lamps from being over driven preventing premature end
of life. When VCS > VCSTH the C D capacitor will begin to charge and the CD pin voltage will rise. As this occurs
the duty cycle will begin to adjust, i.e. the HO on time will become gradually shorter and the LO on time will
become gradually longer. The dead time will remain constant at all times. In this way the power to the output will
be reduced while the frequency remains at f MIN . As the CD voltage rises, the duty cycle will be further reduced. If
VCS then drops below VCSTH then the duty cycle will be regulated at that point and thus the current will be
maintained at this limit. If VCS remains above VCSTH then the voltage will continue to rise on C D until it reaches
VCDMAX, at which point the duty cycle reaches its minimum limit DC MIN and the IRS2552D will enter FAULT
mode, requiring V CC to fall below UVLO- and then rise above UVLO+ in order to re-start.
Frequency, Current, and Dead Time Calculation
The running frequency of the IRS2552D is given by the following formula:
f MIN =
1
2 . 09 ? C T ? R MIN
where V MIN = 5 V, i.e. When the ignition ramp is complete and R MAX has no further effect on the oscillator.
The ignition frequency given by:
f MAX =
1
2 . 09 ? C T ? R MAX
and the dead time is calculated by:
t DT = R DT ? C DT ? ln( 1 . 5 )
t DT = 0 . 405 ? R DT ? C DT
www.irf.com
17
? 2009 International Rectifier
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相关代理商/技术参数 |
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| IRS2552DSTRPBF | 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 |
| IRS2573 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:HID BALLAST CONTROL IC |
| IRS2573D | 制造商:IRF 制造商全称:International Rectifier 功能描述:HID BALLAST CONTROL IC |
| IRS2573DSPBF | 功能描述:功率驱动器IC HID BALLAST CTRL IC 600V 180mA 1.2us 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 |
| IRS2573DSTRPBF | 功能描述:功率驱动器IC Buck & Full-Brdg HID 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 |
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