参数资料
| 型号： | IRPLDIM3 |
| 厂商： | International Rectifier |
| 文件页数： | 15/27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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collector node is then connected via R18 to CDIV and R19 to 0 V (COM). This averages the PWM signal
and provides a DC reference to connect to the IRS2158D, which varies between 0V and the maximum
voltage set. The range can be changed if necessary by adjusting the value of R19.
The value of the lamp current sensing resistor RLS will determine the feedback voltage provided
to the op-amp feedback circuit of the IRS2158D. The value of RLS should be selected to provide as large a
feedback as possible without dissipating too much power at maximum light output. It is recommended to
keep the power dissipation in RLS below 0.25 W.
A delay is usually incorporated into dimming ballasts to provide a smooth fade from one dimming
level to the next. For example, if the control inputs were to be shorted together, the lamp would fade down
to minimum brightness over a period determined by the values used. This neatly avoids any flicker that
may be caused by sudden changes in load in the PFC boost regulator section. In this case delay is provided
via the time constant of R18 and CDIV. As the frequency of the PWM signal from the opto-isolator is of
the order of tens of Hz, the delay has been designed to be long enough to ensure minimal ripple on the DC
control voltage input to the IC. This can be increased if a longer fade time is desired by making CDIV
larger.
Since the lamp arc current is being sensed with a resistor, it is necessary to use voltage mode
preheating to avoid detecting the sum of the current in the arc added to the resonant output capacitor
(CRES) current. This has an additional advantage that during preheat and prior to ignition of the lamp the
arc current will always be zero and consequently the feedback circuit will not influence the oscillator
frequency at all until the lamp is running. This means that by setting the value of RPH the preheat will
occur in exactly the same way independent of the dimming control voltage achieving optimum preheat and
ignition under all conditions.
Design of the Ballast
The initial step in designing the ballast is to determine values required for the resonant output
inductor LRES and capacitor CRES. The Ballast Design Assistant (BDA) software, which can be
downloaded from the International Rectifier web site, is an extremely useful tool in doing this. The BDA
software used should be Version 4.2.x or above, this can be determined by clicking the Help button and
clicking About Ballast Designer.
The following inputs were selected:
IC
Input
Lamp
Configuration
IRS2158D
90 to 265VAC/500VDC
T5 28W
Single lamp/Voltage mode heating
Table 2: Initial BDA inputs. Lamp type: TL5/28W, Line Input Voltage: 90-305 VAC
The next step is to click “ Calculate” . This displays the operating point for the ballast and
calculates the values of the tank components, i.e. LRES = 5.9 mH and CRES = 3.3 nF.
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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