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參數(shù)資料
| 型號(hào)： | L6585DTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.6 A POWER FACTOR AND FLUORESCENT LIGHT CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | LEAD FREE, SOP-20 |
| 文件頁數(shù)： | 9/25頁 |
| 文件大?。?/td> | 1478K |
| 代理商： | L6585DTR |
L6585D
Half-bridge current control
17/25
7
Half-bridge current control
The information about the lamp current can be obtained by reading the voltage across a
sense resistor placed in series to the source of the half-bridge low side MOS.
This circuitry is enabled at the end of the pre-heating phase and it enriches the L6585D with
two features:
●
Controlled lamp voltage/current during ignition (Figure 5): by properly setting the
sense resistor (such that the VHBCS level is crossed in correspondence of a lamp
voltage higher than the ignition voltage) it is possible to limit the maximum lamp voltage
during ignition. In case of this occurrence, then the L6585D would react with a small
frequency increase that allows limiting the lamp voltage (V+IGN). This also prevents the
risk of crossing the resonance frequency of the LBALLAST-CRES circuit. If the lamp
–
EOI internal switch opens and its voltage moves asymptotically to 2V
–
The switching frequency reaches the operating one;
–
When TCH reaches 1.52, it will be discharged
If instead that the lamp hasn’t ignited after a time equal to the pre-heat time (Figure 5
right) the oscillator stops, the chip enters low consumption mode and this condition is
latched until the mains supply voltage is removed or a re-lamp is detected.
●
Over-current protection during run mode: if the HBCSL threshold is crossed, the TCH
internal generator is turned on as well as the one at pin EOI causing a frequency
increase: this implements a current control structure.
During run mode another protection is active: a second comparator (HBCSH) on the pin
HBCS detects anomalous current flow through the sense resistor such as the spikes
generated by the capacitive mode; the crossing of this second threshold latches the IC.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6590 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:FULLY INTEGRATED POWER SUPPLY FIPS |
| L6590A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FULLY INTEGRATED POWER SUPPLY |
| L6590AN | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 700 Volt Monolithic RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6590D | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 700 Volt Monolithic RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6590D013TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 700 Volt Monolithic RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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