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參數(shù)資料
| 型號： | L6567D |
| 廠商： | 意法半導體 |
| 英文描述： | HIGH VOLTAGE DRIVER FOR CFL |
| 中文描述： | 高壓驅動節(jié)能燈 |
| 文件頁數(shù)： | 7/15頁 |
| 文件大?。?/td> | 115K |
| 代理商： | L6567D |
7/15
L6567
Figure 2. Preheating and ignition state.
Ignitionmode
At the end of the preheat phase the frequency decreses to the minimum frequency (F
MIN
), causing anincreased
coil current and a high voltage appearing across the lamp. That is because the circuit works near resonance.
This high voltage normally ignites the lamp. There is no protection to avoid high ignition currents through the
MOS transistors when the lamp doesn’t ignite. Thisonly occurs inan end of lamp life situation in which thecircuit
may break. Now the lowest frequency is the resonance frequency of L and C
L
(the capacitor across the lamp).
The ignition phase finishes when the frequency reaches F
MIN
or (at maximum) when the ignition time has
elapsed. The ignition time is related to T
PRE
: T
IGN
= (15/16) · T
PRE
. The C
P
capacitor is charged 15 times with
the same current used to charge it during T
PRE
.
The frequency shifting slope is determined by C
I
.
During the ignition time the V
RS
monitoring function changes in the capacitive mode protection.
Steady state operation: feed forwardfrequency
The lamp starts operating at F
MIN
, determined by R
REF
and C
F
directly after the ignition phase. To prevent too
high lamp power at high mains voltages, a feed forward correction is implemented. At the end of the preheat
phase the R
HV
pinisconnected to an internal resistor to sense the HighVoltage Bus.If the current in this resistor
increases and overcomes a value set by R
REF
, the current that charges the oscillator capacitor C
F
increases
too. The effect is an increase in frequency limiting the power in the lamp. In order to prevent feed forward of the
ripple of the V
HV
voltage, the ripple is filtered with capacitor C
P
on pin 8 and an integrated resistor R
AVERAGE
.
Figure 3. Burn state
TIME
FREQUENCY
F
MAX
F
MIN
preheating
state
ignition
state
burning state
F
MIN
feed forward mode
FREQUENCY
Irhv
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6569 | 功能描述:功率驅動器IC Hi-Volt Half Bridge RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6569 | 制造商:STMicroelectronics 功能描述:IC HALF BRIDGE+OSC 6569 DIP8 |
| L6569A | 功能描述:功率驅動器IC Hi-Volt Half Bridge RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6569A | 制造商:STMicroelectronics 功能描述:IC HALF BRIDGE+OSC 6569 DIP8 |
| L6569AD | 功能描述:功率驅動器IC Hi-Volt Half Bridge RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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