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參數(shù)資料
| 型號(hào)： | KA7541D |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Simple Ballast Controller |
| 中文描述： | 0.3 A FLUORESCENT LIGHT CONTROLLER, 56 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大小： | 95K |
| 代理商： | KA7541D |
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KA7541
7
For example, the soft start capacitor of 0.2
μ
F makes the soft start time (tss) to be 1.28sec.
Figure 3. Frequency & Soft start capacitor voltage variation during soft start
No Lamp Protection
When the voltage at pin #4 is lower than 2V, the gate drive output is off state, so the external power MOSFET stops switching.
In no lamp protection circuit the dc link voltage is divided by a couple of resistors including both lamp filaments, and The
divided voltage is applied to the pin #4 before the MOSFETs start switching.
When in normal mode the average voltage of the V3 is the half of the dc link voltage (Vdd). So, in order to make stable start
condition, the resistors are designed to make the voltage of V3 to be the half of the dc link voltage.
tss
-----------------
V
×
i
=
313
×
6
–
2
×
9
–
10
-----------------------------------
1.28s
=
=
fsw, V
CS
fsw (pre)
fsw (nor)
2V
tss
V
R4
Vdd
R
R
1
-----------------------------------------
f
+
2
R
4
+
+
---------------------+
×
=
400
180K
-------------------+
2
15K
+
+
--------------------------------------------------------------------------------------------
×
V
3
V
2
R
+
R
2
R
3
--------------------
×
200V
=
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| KA7541DTF | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Ballast Controller Electronic 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(kāi)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 |
| KA75420 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage Detector |
| KA75420M | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage Detector |
| KA75420MTF | 功能描述:監(jiān)控電路 Voltage Detector 4.2V RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| KA75420Z | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage Detector |
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