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| 型号： | IRS2530DSTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | IC DIMMING BALLAST CTRL 8-SOIC |
| 标准包装： | 1 |
| 系列： | DIM8™ |
| 类型： | 镇流器控制器 |
| 频率： | 34.2 ~ 115 kHz |
| 电流 - 电源： | 5mA |
| 电流 - 输出： | 260mA |
| 电源电压： | 12.6 V ~ 15.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 配用： | IRPLDIM5E-ND - KIT DES BALLAST 4LEVEL DIM FLUOR IRPLDIM4E-ND - KIT DES BALLAST 26W IRS2530D IRPLCFL8U-ND - KIT DES FLUOR BALLAST IRS2530D |
| 其它名称： | IRS2530DSTRPBFDKR |
IRS2530D(S)
Component Selection
Proper design of the circuit schematic (see Typical Application Diagram, Page 1) and component selection is
important for achieving proper ballast functionality and preventing problems. The following design procedure
should be followed for determining the various programming and filtering component values:
1) Capacitor CPH programs the desired preheat/ignition time. CPH is charged up by an internal 1 μ A
current source at the VCO pin. The value of CPH is determined by:
C PH =
I VCO ? t PH / IGN
V VCOFLT
=
1 μ A ? t PH / IGN
4 V
2) Capacitor CVCO programs the speed of the dimming feedback loop. To ensure smooth and stable
dimming, CVCO should be small enough such that the dimming loop reacts to lamp current changes
each switching cycle. The value of CVCO is typically fixed for most lamp types and is given as:
C VCO = 2 . 2 nF
3) Resistor RVCO and capacitor CPH provide additional compensation of the dimming loop to prevent
the VCO voltage from changing too much over a given switching cycle. The value of RVCO is
typically fixed for most lamp types and is given as:
R VCO = 1 . 5 k Ω
4) Resistor RCS measures the lamp current for dimming. RCS should be kept small to minimize power
losses but the peak voltage across RCS at the lowest lamp current dimming level should be above a
minimum level to avoid noise problems. Using the minimum rms lamp current during dimming, a
minimum allowable peak voltage level across RCS of 100 mV, and an additional factor of 5 (signal
attenuation due to RFB and CDIM), the value of RCS is determined by:
R CS =
100 mV
I LAMP _ RMS _ MIN ? 2
× 5
Using the maximum rms lamp current, the power loss in resistor RCS is then determined by:
P LOSS _ RCS = ( I LAMP _ RMS _ MAX ) 2 × R CS
5) The additional feedback components include RFB for current limiting and noise filtering, CFB for DC
blocking, and CDIM for noise filtering. The value of these components are typically fixed for most
lamp types and are given as:
R FB = 1 k Ω
C FB = 0 . 1 μ F
C DIM = 10 nF
6) Capacitors CVCC2 and CBS are the low-side and high-side supply capacitors for maintaining their
respective supply voltages and providing high-frequency noise filtering. These capacitors are
typically fixed and are given as:
C VCC 2 = C BS = 0 . 1 μ F
www.irf.com
17
? 2008 International Rectifier
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