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參數(shù)資料
| 型號： | KA7543D |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Advanced Feedback Dimming Ballast Control IC |
| 中文描述： | 0.3 A FLUORESCENT LIGHT CONTROLLER, 8 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | SOP-14 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 131K |
| 代理商： | KA7543D |
KA7543
8
Dimming Control Stage
Figure 5. Dimming Control Stage
The condition for full dimming is when the Vdm voltage is 2V and the condition for full lighting is when the Vdm voltage is
0V. Dimming operation starts when Vcs becomes 4V and the change rate of dimming is determined by the capacitor
connected to the Cdm pin. The more smooth dimming can be accomplished by the larger capacitor connected to the Cdm pin.
If the Vdm pin voltage is higher than 5V, then the output drive stage remains in off state. Dimming control and output drive on/
off control can be achieved with only one pin.
Output Drive Stage
Figure 6. Output Drive Stage
OUT1 and OUT2 are complementary and there is 1.4us dead time for the ZVS operation. The structure of output stage is the
totem-pole output stage. For the high side MOSFET drive, a pulse transformer is necessary.
No Lamp Protection
If the Vld pin voltage is lower than 1V, it means that there is no lamp connected. On no lamp condition, the output drive stage
is in off state.
9
Switch
-
+
+
+
-
2V
20k
Mirror
Dimmer
idr
is-id
id
+
-
Vdm
11
is
To error amp (+)
5V
Cdm
To output
CURRENT
AMPLIFIER
DIMMING
CONTROL
1
OUT1
14
OUT2
From oscillator
Q
Frequency
divider
Output
stage
From protection output from uvlo
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KA75450 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage Detector |
| KA75450M | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage Detector |
| KA75450MTF | 功能描述:監(jiān)控電路 Voltage Detector 4.5V RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 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 |
| KA75450Z | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage Detector |
| KA75450ZBU | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 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 |
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