参数资料
| 型号： | IRPLDIM3 |
| 厂商： | International Rectifier |
| 文件页数： | 23/27页 |
| 文件大小： | 0K |
| 描述： | KIT DES FLUOR BALLAST IRS2158D |
| 标准包装： | 1 |
| 主要目的： | 照明，镇流器控制 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | IRS2158D |
| 主要属性： | 28W TL5，可调光，PFC，灯开路、使用寿命结束和断电保护 |
| 次要属性： | 点火预热 |
| 已供物品： | 板，CD |
| 相关产品： | IRS2158DSPBF-ND - IC DVR HALF BRIDGE 600V 16-SOIC IRS2158DPBF-ND - IC DVR HALF BRIDGE 600V 16-PDIP IRS2158DSTRPBF-ND - IC BALLAST CTRL 600V 16-SOIC |
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voltage range can be found to comply within the 3 to 5.5 times cold resistance limits. The cold resistance
can be easily measured with a digital multi-meter (DMM).
When the ballast is running, a true RMS digital voltmeter or differential oscilloscope probe can be
connected across the lower cathode and the voltage can be observed at maximum and minimum brightness.
The cathode voltage normally increases as the ballast is dimmed. The values of COUT1 and COUT2 plus
the resonant output inductor heater windings will control how much. Reducing the capacitance will reduce
the amount by which the voltage rises. The COUT1 and COUT2 values should be chosen to prevent the
voltage exceeding the upper limit at minimum output to prevent premature end blackening of the lamps and
reduced life.
Note that utilizing additional windings on the inductor to provide cathode heating means that
power is transferred through the core and consequently the core losses will increase and hence the core
operating temperature. The core will reach its highest operating temperature when the ballast is running at
minimum brightness.
The component values in this design have been selected for a 28W T5 linear lamp. The circuit will
need to be optimized for the particular lamp used to obtain best performance.
Ignition
The IRS2158D incorporates regulated ignition control.
Fig 16. Lamp Voltage and CPH pin voltage - No Ignition
At the end of the preheat period the IRS2158D VCO pin voltage increases and so the frequency
decreases until the voltage at the CS pin reaches the internal threshold of 1.25 V. At this point the
IRS2158D internally pulls down the VCO pin voltage and therefore regulates the circulating current in the
resonant output circuit of the ballast and maintains a constant voltage across the lamp (green trace). This
voltage will remain while the CPH pin voltage (red trace) charges from 1/3VCC to 1/2VCC. If the lamp has
not ignited at this point the IRS2158D will shut down. If preheat is insufficient the ballast will fail to ignite
and shut down at the end of the ignition phase as shown in Fig 16 . In this design the ignition voltage has
been set at 1.25 kV peak and 2 kV peak to peak. This ignition voltage is correct for worst case conditions in
a 28W TL5 lamp and can be set by using an RCS value of 1.5R.
A good lamp normally ignites as the output voltage ramps up to the ignition regulation level as
shown in Fig 17 .
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