参数资料
型号: IRS2158DSTRPBF
厂商: International Rectifier
文件页数: 25/30页
文件大小: 0K
描述: IC BALLAST CTRL 600V 16-SOIC
标准包装: 2,500
类型: 荧光灯驱动器
频率: 42.5 ~ 48.5 kHz
电流 - 电源: 3.5mA
电流 - 输出: 260mA
电源电压: 11.5 V ~ 15.6 V
工作温度: -40°C ~ 125°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC N
包装: 带卷 (TR)
配用: IRPLDIM3-ND - KIT DES FLUOR BALLAST IRS2158D
IRS2158D(S)
C PH =
t PH
R CPH
[Farads]
(7)
Step 5: Program Ignition Ramp Time
The preheat time is defined by the time it takes for the external capacitor on pin VCO to charge up to 5V.
The external timing resistor (RPH) connected to FMIN charges capacitor CVCO. The ignition ramp time is
therefore given as:
t RAMP = R PH ? C VCO
or
[Seconds] (8)
C VCO =
t RAMP
R PH
[Farads]
(9)
Step 6: Program Maximum Ignition Current
The maximum ignition current is programmed with the external resistor RCS and an internal threshold of
1.2V. This threshold determines the over-current limit of the ballast, which will be reached when the
frequency ramps down towards resonance during ignition and the lamp does not ignite. The maximum
ignition current is given as:
I IGN =
1.2
R CS
[Amps Peak]
(10)
or
R CS =
1 . 2
I IGN
[Ohms]
(11)
VCC Double Filter
It is recommended to utilize a double filter arrangement from the charge pump (CSNUB, DCP1 and DCP2)
to VCC as shown in the schematic of Figure 9. This circuit is designed to protect the VCC supply pin of the
IRS2158D from high peak currents that occur when the MOSFET MHS switches VS from COM to VBUS.
DCP2 should be an 18 V rated zener diode and RSUPPLY should connect to the cathode of DCP2. This is
to protect the VCC input of the IRS2158D from possible surges and transient voltages.
Figure 9: VCC Double Filter Arrangement
www.irf.com
25
? 2009 International Rectifier
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