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参数资料
| 型号： | IRPLCFL8U |
| 厂商： | International Rectifier |
| 文件页数： | 10/27页 |
| 文件大小： | 0K |
| 描述： | KIT DES FLUOR BALLAST IRS2530D |
| 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： | IRS2530D |
| 主要属性： | 32W，调光，120 VAC |
| 次要属性： | 预热，自动预热，电压不足保护 |
| 已供物品： | 板，CD |
| 相关产品： | IRS2530DSPBF-ND - IC BALLAST CTRL DIM 600V 8-SOIC IRS2530DSTRPBFDKR-ND - IC DIMMING BALLAST CTRL 8-SOIC IRS2530DSTRPBFCT-ND - IC DIMMING BALLAST CTRL 8-SOIC IRS2530DSTRPBFTR-ND - IC DIMMING BALLAST CTRL 8-SOIC IRS2530DPBF-ND - IC CTRL BALLAST DIMMING 8-DIP |
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6. Functional Description
The IRS2530D design utilizes a voltage doubler at the front end in all modes of operation
giving a fixed DC bus voltage approximately 300V. By correctly selecting value of the
snubber capacitor it is not difficult to achieve soft switching in all modes of operation.
The front end of the IRPLCFL8U ballast circuit shows the neutral line input (i.e. the one
that is always connected) connected to the center point of the DC bus storage capacitors
C3 and C4. Live inputs L1 and L2 are connected to two completely separate voltage
doubler diode pairs which are connected to the DC bus. These four diodes are all
contained within the bridge BR1 (This is shown as D1, D2, D3 and D4 in the schematic of
Fig 6). If live input L1 is connected to the line, a 60Hz sinusoidal AC voltage will be present
at the point where the anode of D1 joins the cathode of D3. This voltage will swing
between the 300V DC bus voltage and the 0V COM point of the circuit. If live input L1 is
not connected to the line this point will be floating with only residual voltage present. The
same applies with live input L2 at the point where the anode of D2 meets the cathode of
D4. These two points are fed via resistors R5 and R6 to the parallel combination of R7 and
C5, which are connected to 0V COM. The value of C5 is high enough to ensure that the
amount of ripple that is present at the junction of C5 and RDIM will be negligible so a DC
voltage will effectively appear there. This sets the reference voltage level for the dimming
feedback loop.
As a result this dimming control voltage will change depending on whether live input L1 is
connected only, live input L2 is connected only or both are connected, which depends on
the three way dimming rotary switch position. The values of R5 and R6 will be chosen so
that this voltage is substantially different if either live input L1 of live input L2 are
connected alone and these values are selected to set the desired low and mid light levels.
In this application R5 can be selected to give the correct reference voltage to provide 50%
light output as perceived by the human eye, which occurs at a point somewhat lower than
50% ballast power and R6 can be chosen for 75% which is at about 50% of the nominal
total ballast power at full light output.
The design problem overcome here is that the dimming control voltage obtained through
R5 and R6, where the values have been selected to provide minimum and medium light
outputs, is not sufficiently high to provide maximum light output when both live inputs are
connected. This being the case it was necessary to add the two pull up transistors Q1 and
Q2. When both inputs L1 and L2 are connected, i.e. when the rotary switch is in the fully
on position, the voltage at RDIM will be pulled high enough to ensure that the ballast
operates at maximum output since the transistors Q1 and Q2 will both be switched on in
this case.
Q1 and Q2 are small signal NPN devices, however they need to be rated to 300V VCEO
to prevent any conduction if either one is switched off. The zener diode DZ1 had been
added to ensure that Q1 and Q2 can fully switch off. This is because even when not
connected to the line some voltage appears at the bases of these devices. Since Q1 and
Q2 are configured as emitter followers the base voltage must exceed the breakdown
voltage of DZ1 (68V) in order to switch on, which can only occur when the corresponding
line input is connected through the rotary switch.
www.irf.com
RD0803
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| IRPLDIM3 | KIT DES FLUOR BALLAST IRS2158D |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRPLCFL9U | 功能描述:电源管理IC开发工具 3 lvl Dim CFL Fluor Ballast Ref dsgn 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 |
| IRPLDIM1 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Dimming Ballast Control IC Design Kit |
| IRPLDIM1E | 功能描述:KIT BALLAST DIMMING 230VAC RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
| IRPLDIM1U | 功能描述:BALLAST DIMMING 32W/T8 120VAC RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
| IRPLDIM2A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digitally Addressable DALI Dimming Ballast Reference Design |
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