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| 型号： | IRS21571DSTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC BALLAST CONTROL 600V 16SOIC |
| 标准包装： | 2,500 |
| 类型： | 镇流器控制器 |
| 频率： | 43.7 ~ 48.3 kHz |
| 电流 - 电源： | 10mA |
| 电流 - 输出： | 180mA |
| 电源电压： | 11.5 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 |
| 包装： | 带卷 (TR) |
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IRS21571D
Preheat
Ignition
Ramp
Run
Figure 7: Lamp filament voltage during the
preheat, ignition ramp and run modes
The Preheat Time is programmed by means of the preheat capacitor, C PH , an internal 1 μ A current source, and
an internal threshold on the CPH pin of 4.0V, according to the following formula:
t PH = 4E6 ? C PH ,
or
C PH = 250E - 9 ? t PH
At the end of the Preheat Time, the internal, open-drain transistor holding the RPH pin to ground turns off, and
the voltage on this pin charges exponentially up to the R T pin potential. During this Ignition Ramp Mode, the
output frequency exponentially decays to a minimum value. The rate of decay of this frequency is a function of
the R PH ? C RAMP time constant. Because the Ignition Ramp Mode ends when the voltage on the CPH pin
reaches 5.15V, the Ignition Ramp Mode is always 1/4th as long as the preheat time.
When the CPH pin reaches 5.15V, an open-drain transistor on the RUN pin turns on, and the external R RUN
resistor is then in parallel with the R T resistor. The Run Mode operating frequency is therefore a function of the
parallel combination of R RUN and R T , and this means that the operating power of the lamp can be programmed by
means of R RUN .
The following graphs, Figures 8 and 9, illustrate the relationship between the effective R T resistance (i.e., the
parallel combination of resistors which programs the C T capacitor charging current) and the operating frequency.
www.irf.com
18
? 2008 International Rectifier
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| IRS2158D | 制造商:IRF 制造商全称:International Rectifier 功能描述:Ballast control and half-bridge driver in one IC |
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