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| 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： | 14/33页 |
| 文件大小： | 2064K |
| 代理商： | L6585DE |
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L6585DE
Ballast section
21/33
6.3
Startup sequence with old or damaged lamps
When an old lamp is connected to the ballast the strike voltage is higher than the nominal
voltage and may also be higher than the safety threshold. In this case the lamp can ignite in
a time longer than ignition time or may not ignite. In both cases, during ignition time,
because of the frequency decrease, the voltage at the output of the ballast can easily reach
dangerous values.
The same occurs if the lamp tube is broken: the lamp cannot ignite and the lamp voltage
must be limited.
During ignition time, the L6585DE senses the current flowing into the lamp through a sense
resistor connected to the HBCS pin. If the HBCS pin voltage reaches 1.6 V, a small amount
of current is sunk from the EOI pin causing a small frequency increase. This frequency
modification results, macroscopically, in a frequency regulation and therefore a current
regulation and a lamp voltage limiting.
As soon as the HBCS pin voltage reaches 1.6 V, the TCH pin starts to charge Cd: when the
TCH voltage reaches 4.63 V, the TCH pin is no longer left free (as during preheating), but it
sinks 26 uA, causing a faster discharge of Cd. When the TCH voltage reaches 1.5 V, the pin
is pulled down and HBCS voltage is checked. If it is above 1.05 V the IC is stopped.
If the lamp ignites during this reduced TCH cycle, the EOI pin stops sinking current and if it
reaches 1.9 V, the IC enters run mode and TCH pin is immediately pulled down.
Figure 11.
Startup procedures with old or damaged lamps
It can be noted that the reduced TCH cycle time depends only on the value of Cd. It is
suggested to start from the choice of Cd in order to obtain the protection time, and then can
proceed to the choice of Rd to obtain the desired TPRE.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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