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参数资料
| 型号： | L6585DE |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | POWER FACTOR CONTROLLER, PDSO20 |
| 封装： | ROHS COMPLIANT, SOP-20 |
| 文件页数： | 15/33页 |
| 文件大小： | 2064K |
| 代理商： | L6585DE |
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Ballast section
L6585DE
22/33
6.4
Old lamp management during run mode
During run mode, an old lamp can exhibit three different abnormal behaviors:
●
Rectifying effect
●
Over-current
●
Hard switching event
6.5
Rectifying effect
The rectifying effect is related to a differential increase of the ohmic resistance of the two
cathodes. The lamp equivalent resistance is therefore higher when the lamp current flows in
one direction than in the other. The current waveform is distorted and the mean value of the
lamp current is no longer zero. The EOL pin is the input of an internal window comparator
that can be triggered by a voltage variation due to rectifying effect.
The reference of this comparator and the amplitude of the window can be set by connecting
a suitable resistor to EOLP pin as indicated in following table:
The reference of this comparator can be set at a fixed voltage or at the same voltage as the
CTR pin.
The fixed reference configuration (see Figure 12) can be used when the lamp is connected
to ground, and requires two Zener diodes in order to shift the mean value of the lamp
voltage to 2.5 V. The values of the two Zeners affect the symmetry of the intervention of the
protection: the best symmetry is obtained choosing two values whose difference is equal to
twice the reference voltage:
●
VUP = VREF + VZ2 + VF1 + W/2
●
VDOWN = VREF – (VZ1 + VF2) – W/2
●
VUP = - VDOWN
●
2 VREF = VZ1 VZ2
Where VUP and VDOWN are the maximum allowed values of VK
The tracking configuration (see Figure 13) is useful when the lamp is connected between
choke and blocking capacitor in the block capacitor-to-ground configuration. In this
configuration the voltage across the blocking capacitor is affected by the voltage ripple
superimposed on the PFC output. Using a reference affected by the same ripple helps to
reject it and avoid premature triggering of the comparator.
As soon as the comparator is triggered, a Tch cycle starts in order to improve the noise
immunity.
Table 5.
EOL window comparator configuration table
EOLP resistor range
Reference
Window amplitude (Wv)
22 k ÷ 27 k
VCTR
+160 mV / -150 mV
75 k ÷ 91 k
2.5 V
240 mV
220 k ÷ 270 k
VCTR
+ 250 mV / -240 mV
> 680 k
2.5 V
720 mV
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相关代理商/技术参数 |
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| L6585DETR | 功能描述:功率因数校正 IC Combo IC for PFC and ballast control RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6585DTR | 功能描述:DC/DC 开关控制器 Combo IC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6590 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:FULLY INTEGRATED POWER SUPPLY FIPS |
| L6590A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FULLY INTEGRATED POWER SUPPLY |
| L6590AN | 功能描述:开关变换器、稳压器与控制器 700 Volt Monolithic RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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