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参数资料
| 型号： | L6585DTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A POWER FACTOR AND FLUORESCENT LIGHT CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | LEAD FREE, SOP-20 |
| 文件页数： | 5/25页 |
| 文件大小： | 1478K |
| 代理商： | L6585DTR |
L6585D
Application information
13/25
5.1.2
Ignition (time interval B Figure 5)
When the voltage at pin TCH drops down to 1.50V (typ.), the pin EOI is driven in high
impedance state and CIGN is exponentially charged according to the time constant τ given
by CIGN*RPRE that defines the ignition time and the frequency shift starts.
The ignition time is the time necessary to EOI voltage to reach 1.9V, so, by means of simple
calculation:
Equation 3
During this phase, the half-bridge current control can limit the maximum voltage applied
to the lamp by forcing small frequency increases whenever the half-bridge sense resistor
voltage exceeds the HBCSH threshold (see the “Half-Bridge current control” paragraph).
Figure 5, centre and right, shows the L6585D behavior as the lamp gets older; if it doesn’t
ignite for a time longer than the pre-heating one (counted by a cycle charge/discharge of the
TCH pin), the IC is stopped, enters low consumption and waits for either a re-lamp or an
UVLO.
T
IGN
3C
IGN
R
PRE
=
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| L6590 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:FULLY INTEGRATED POWER SUPPLY FIPS |
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| L6590D013TR | 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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