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| 型号： | IRS2573DSPBF |
| 厂商： | International Rectifier |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC BALLAST CNTRLLER 600V 28-SOIC |
| 标准包装： | 25 |
| 类型： | HID 灯控制器 |
| 频率： | 160 ~ 240 Hz |
| 电流 - 电源： | 10mA |
| 电流 - 输出： | 180mA |
| 电源电压： | 9.5 V ~ 16.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
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IRS2573D
Constant Power Control
During the general mode of operation and after the lamp has ignited, the IC regulates the lamp output power to a
constant level. To achieve this, the IC measures the lamp voltage and lamp current at the VSENSE and
ISENSE pins, multiplies the voltage and current together using an internal multiplier circuit to calculate power, and
regulates the output of the multiplier circuit to a constant reference voltage by increasing or decreasing the buck
on-time. If the lamp power is too low then the output of the multiplier will be below the internal reference voltage.
The operational trans-conductance amplifier (OTA) will output a sourcing current to the PCOMP pin that will
charge up the external capacitor to a higher voltage.
This will increase the on-time of buck and increase the
output current to the lamp for increasing the output power. If the lamp power is too high, then the opposite will
occur. The OTA will output a sinking current to the PCOMP pin that will discharge the external capacitor to a
lower voltage. This will decrease the buck on-time and decrease the output current to the lamp for decreasing
the output power. The speed of the constant power control loop is set by the value of the external capacitor at
the PCOMP pin that determines how fast the loop will react and adjust the buck on-time over the changing load
conditions.
Current Limitation Control
The constant power control loop will increase or decrease the buck current for maintaining constant power in the
lamp load. During lamp warm-up, the lamp voltage can be very low (20V typical) and the constant power loop
will attempt to increase the buck current to several amps of current to maintain constant power. This high
current can exceed the manufacturer’s maximum current rating for the HID lamp. To prevent this condition, an
additional current limitation control loop has been included in the IC. Should the voltage at the ISENSE pin
exceed the voltage level at the OC pin, another OTA will sink current from the ICOMP pin. When the ICOMP pin
voltage decreases below the PCOMP pin voltage, then the current limitation loop will override the constant power
loop and the ICOMP pin will decrease the buck on-time. The lower of the PCOMP or ICOMP pins will override
the other and control the buck on-time. When the lamp eventually warms up and the lamp voltage increases to a
level where the lamp current is below the maximum allowable limit (Figure 8), then the ICOMP pin voltage will
increase above the PCOMP pin voltage, and the PCOMP pin will control the buck on-time again for maintaining
constant power.
V, I
Lamp Warm-up
Running
VSENSE
POWER
ISENSE
t
Ignition
Current
Constant Power
Limitation
Figure 8, VSENSE and ISENSE pins during ignition, warm-up and running modes.
Over-Voltage Fault Counter
The IC includes an over-voltage fault counter at the VSENSE pin. The over-voltage fault counter will count the
time during which an over-voltage condition at the output of the buck exists due to an open-circuit condition,
lamp extinguishes, lamp removal or end-of-life. If the voltage at the VSENSE pin remains above VOV(2/5) and
the over-voltage fault counter times out (787sec typical), then the IC will enter Fault Mode and shutdown. If the
voltage at the VSENSE pin decreases below VOV(2/5) before the over-voltage fault counter times out, then the
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20
? 2009 International Rectifier
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| 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 |
| IRS25801DSTRPBF | 制造商:International Rectifier 功能描述:600V 999.000A SOIC - Tape and Reel 制造商:International Rectifier 功能描述:IC POWER FACTOR CORRECT PFC |
| IRS25803DSPBF | 制造商:International Rectifier 功能描述:CIC SOIC-8N - Tape and Reel 制造商:International Rectifier 功能描述:SEMICONDUCTOR OTHER 制造商:International Rectifier 功能描述:Fluorescent PFC 305VAC SOIC |
| IRS25803DSTRPBF | 制造商:International Rectifier 功能描述:CIC SOIC-8N - Tape and Reel 制造商:International Rectifier 功能描述:SEMICONDUCTOR OTHER 制造商:International Rectifier 功能描述:Fluorescent PFC 305VAC SOIC |
| IRS2580DSPBF | 功能描述:功率驱动器IC COMPBO8 PFC HALF-BRDG BALLAST 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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