参数资料
| 型号： | IRPLDIM2U |
| 厂商： | International Rectifier |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | BALLAST DIM DIG 32W/T8 120VAC |
| 标准包装： | 1 |
| 主要目的： | 照明，镇流器控制 |
| 已用 IC / 零件： | IR21592 |
| 已供物品： | 板，文档 |
| 相关产品： | IR21592STRPBF-ND - IC CTLR BALLAST DIMMING 16SOIC IR21592PBF-ND - IC CTLR BALLAST DIMMING 16-DIP IR21592SPBF-ND - IC CNTRLR BALLAST DIMMING 16SOIC IR21592-ND - IC CTRLR BALLAST DIMMING 16-DIP IR21592S-ND - IC CNTRLR BALLAST DIMMING 16SOIC IR21592STR-ND - IC CNTRLR BALLAST DIMMING 16SOIC |
| 其它名称： | *IRPLDIM2U |
IRPLDIM2U
The shutdown signal (RB4) enables or disables the IR21592. When high, the lamp is off and the IR21592 is
disabled with minimal current flowing. When low, the lamp is on. The PIC16F628 has control of this line and
determines if lamp should be on or off based on fault conditions and user requested settings from the DALI. There
are two signals used for fault detection, lamp-out (RB6), and fault (RB5). The lamp-out signal indicates the pres-
ence of a lamp or lamp fault. When the lamp is removed the lamp-out signal is pulled up to VDD by the pull-up
resistor R17 and the software forces the IR21592 to shutdown. When the lamp is changed, this pin goes to 0
Volts, the microcontroller turns the IR21592 on again and the lamp re-starts automatically. Other fault conditions
are indicated by the fault signal (pin FMIN of the IR21592). A low on the fault signal indicates that the IR21592 is
in a fault state (the IR21592 turns off automatically in fault conditions such us VCC fault, over-current, failure to
strike or low AC line and will remain in this FAULT state until the IC is reset.
The IR21592 requires a 0.5-volt to 5-volt analog voltage (in pin DIM) to perform dimming, thus 0.5 volts corre-
sponds to the 1% arc power level and 5 volts corresponds to the 100% arc power level. The PIC16F628 provides
a pulse width modulated signal on pin RB3 that is filtered with a single RC network (R25 and C17). This provides
an analog voltage for dimming. The micro can change the dim voltage from 0.5V to 5V by changing the duty cycle
and therefore generate 256 different voltage levels for the IR21592. To conform to the digital dimming require-
ments, the output is logarithmic rather than linear. Since the human eye is much more sensitive to lower light levels
than high levels, the logarithmic output appears to be linear. Therefore the PIC16F628 is programmed to produce
a logarithmic voltage and the IR21592 drives the lamp arc power (Figure 5).
5
4
3
2
1
0
Logarithmic Voltage Output
100
80
60
40
20
0
Logarithmic Arc Power Output
85
115
145
175
205
235
85
115
145
175
205
235
Digital Input
Digital Input
Fig. 5 Dimming Chacteristics
The microcontroller can also change the fade time by controlling the speed in which the duty cycle changes.
The relation between light level and dim level can be tuned according to specific needs. The minimum light level
can be changed by adjusting RMIN, and the maximum level can be changed adjusting RMAX. RMIN sets the
lower phase boundary corresponding to minimum lamp power when VDIM = 0.5V, and RMAX sets the upper
phase boundary corresponding to maximum lamp power when VDIM = 5V. RMAX must be set after RMIN.
The software
The software to implement the DALI is quite large but simple to understand when broken into some elementary
functional blocks. Figure 6 outlines the basic flow of the software in its most simplified form (the details source
code is available in a CD enclosed with the Reference Design Kit).
6
www.irf.com
相关PDF资料 |
PDF描述 |
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| IRPLDIM3 | KIT DES FLUOR BALLAST IRS2158D |
| IRPLDIM4E | KIT DES BALLAST 26W IRS2530D |
| IRPLDIM5E | KIT DES BALLAST 4LEVEL DIM FLUOR |
| IRPLHALO1E | KIT HALOGIN CONVERTER 100VA |
| IRPLHID2 | KIT DESIGN BALLAST IRS2573D |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRPLDIM3 | 功能描述:电源管理IC开发工具 3 lvl Dim CFL Fluor Ballast w/IRS2158D 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 |
| 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) |
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