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參數(shù)資料
| 型號(hào)： | VK05CFL |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | ELECTRONIC DRIVER FOR CFL APPLICATION |
| 中文描述： | 電子節(jié)能燈驅(qū)動(dòng)的應(yīng)用 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 310K |
| 代理商： | VK05CFL |
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VK05CFL
APPLICATION DESCRIPTION
Technology Overview
The VK05CFL is made by using STMicroelectronics proprietary VIPower M3-3 technology. This
technology allows the integration in the same chip both of the control part and the power stage. The power
stage is the “Emitter Switching”. It is made by putting in cascode configuration a bipolar high voltage
darlington with a low voltage MOSFET. This configuration provides a good trade-off between the bipolars
low ON drop with high breakdown voltage in OFF state, and the MOSFETS high switching speed. The
maximum theoretical working frequency is in the range of 300KHz.
Circuit description
The electrical scheme of the VK05CFL used as a self-oscillating converter to drive fluorescent tubes is
shown in Fig. 1.
Figure 1:
Application schematic
This topology does not require the saturable transformer to set the working frequency. Two secondary
windings are wound on the main ballast choke Lp. These windings have two functions:1) to trigger the ON
state and 2) to provide the power supply to the device. A good trade-off for the ratio between the primary
winding Lp and the two secondary windings is 10:1; in order to minimize the power dissipated on the
resistors R4 - R5 and to guarantee sufficient voltage to supply the device.
The steady-state working frequency is set by the two capacitor C5 and C6. They are charged by a current
I
cap
≈
300
μ
A. When the voltage on the capacitor reaches an internal fixed value the power stage is turned
OFF. By choosing the same value for C5 and C6 the circuit will work with a duty-cycle of 50%. During the
start-up, as the resonance frequency is higher than the steady-state frequency, the secondary voltage
falls lower than the device sustain voltage before the capacitor C5-6 is charged, switching OFF the device.
For this reason the circuit can work at different frequencies during the start-up and steady-state phases.
The resistor R2 and the capacitor C8 are needed to bias the internal diac in the low side device in order
to start-up the system. In the high side device the diac pin must be connected to the midpoint. R1 is the
pull-up resistor and C7 is the snubber capacitor.
Input filtering is realized by R4-C10 and R5-C11. It is necessary to have a proper supply voltage on the
input pin.
L1s
L2s
VK05CFL
Tube
Lp
C8
C7
C3
C2
C5
C6
R2
R1
C10
C11
R4
R5
VK05CFL
Bridge
+
Input Filter
C4
C13
PTC
diac
sec
osc
Source
Collector
diac
sec
osc
Source
Collector
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VK05CFL_03 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:ELECTRONIC DRIVER FOR CFL APPLICATION |
| VK05CFL13TR | 制造商:STMicroelectronics 功能描述: |
| VK05CFL-E | 功能描述:功率驅(qū)動(dòng)器IC Electronic Driver CDF Application RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| VK05CFLTR-E | 功能描述:功率驅(qū)動(dòng)器IC ELECTRONIC DRIVER RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| VK06TL | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:ELECTRONIC DRIVER FOR TL BALLASTS |
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