参数资料
| 型号： | IRPLDIM3 |
| 厂商： | International Rectifier |
| 文件页数： | 13/27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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8. Functional Description
The design of a dimmable ballast for linear lamps requires that the lamp power can be reduced
smoothly to a low output level, less than 5% of nominal lumen output. It is necessary that the lamp output
is able to be held at any level and that there will be no discernable flicker or instability at any level. In order
to accomplish this, a closed loop control scheme is required. The fluorescent lamp represents a complex
load, the impedance of which changes depending on the arc current and temperature of the gasses within
the lamp. Like all discharge lamps, the fluorescent lamp displays a negative resistance behavior, meaning
that as the current in the lamp increases the effective resistance of the lamp will reduce. The lamp
impedance is strongly dependent on the arc current, however the relationship is not linear and temperature
is also a factor.
The IRPLDIM3 ballast as shown in the block diagram of Fig. 1 supplies the lamp through a
resonant output circuit. In this design the lamp power is adjusted by changing the oscillation frequency of
the MOSFET half bridge, which is driven by the IRS2158D. In this system the lamp current against ballast
frequency characteristic of the system exhibits a sharp “knee” characteristic such that as the frequency
increases the lamp current is gradually reduced up to a point at which a small increase of frequency will
result in a large reduction in the lamp current.
Ballast / Lamp Operating Characteristic
Lamp
Current
Ballast Running
Frequency
Fig 6. Lamp Current against Ballast Frequency
Consequently it becomes necessary to include a stabilized closed loop feedback system to control
the lamp current by adjusting the ballast frequency by means of a voltage controlled oscillator (VCO). In
this example the VCO within the IRS2158D is driven by the output of an error amplifier and compensation
network that senses the lamp arc current directly and compares it with a reference.
www.irf.com
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相关PDF资料 |
PDF描述 |
|---|---|
| IRPLDIM4E | KIT DES BALLAST 26W IRS2530D |
| IRPLDIM5E | KIT DES BALLAST 4LEVEL DIM FLUOR |
| IRPLHALO1E | KIT HALOGIN CONVERTER 100VA |
| IRPLHID2 | KIT DESIGN BALLAST IRS2573D |
| IRPLLNR2U | BALLAST 32W/T8 120V AC IR21571 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRPLDIM4E | 功能描述:电源管理IC开发工具 Miniature Dimmable 26W Ballast dsgn kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRPLDIM5E | 功能描述:电源管理IC开发工具 4lvl Swtch Dim Fluor Ballast dsgn Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRPLHALO1E | 功能描述:电源管理IC开发工具 Halogen Cnvrtr 220/230VAC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRPLHID1U | 制造商:International Rectifier 功能描述:600V .500A OTHER - Boxed Product (Development Kits) |
| IRPLHID2 | 功能描述:电源管理IC开发工具 HID Ballast for 70W Lamp Using IRS2573D RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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