- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383237 > L6567 (意法半導(dǎo)體) HIGH VOLTAGE DRIVER FOR CFL PDF資料下載
參數(shù)資料
| 型號(hào)： | L6567 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HIGH VOLTAGE DRIVER FOR CFL |
| 中文描述： | 高壓驅(qū)動(dòng)節(jié)能燈 |
| 文件頁(yè)數(shù)： | 8/15頁(yè) |
| 文件大?。?/td> | 115K |
| 代理商： | L6567 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)當(dāng)前第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)
L6567
8/15
Capacitive mode protection
During ignition and steady state the operating frequency is higher than the resonance frequency of the load
(L,C
L
,R
LAMP
and R
FILAMENT
), so the transistors are turned on during the conduction time of the body diode in
order to maintain Zero Voltage Switching.
If the operating frequency undershoots the resonance frequency ZVS doesn’t occur and causes hard switching
of the MOS transistors. The L6567 detects this situation by measuring V
RS
when the lowside
MOS FET is turned
on. At pin 9 there is an internal comparatorwith threshold V
CMTH
(typ~20mV): if V
RS
< V
CMTH
capacitive mode is
assumed and the frequency is increased as long as this situation is present. The shift is determined by CI.
Steady state frequency
At any time during steady state the frequency isdetermined by the maximum on the following three frequencies:
f
STEADYSTATE
= MAX {F
MIN
, f
FEEDFORWARD
, f
CAPACITIVEMODEPROTECTION
}.
IC supply
At start up the IC is supplied with a current that flows through R
HV
and an internal diode to the V
S
pin which-
charges the external capacitor C
S
. In steady state condition R
HV
is used as a mainsvoltage sensor, so it doesn’t
provide anymore the supply current. The easiest way to charge the C
S
capacitor (and tosupply the IC) is to use
a charge pump from the middle point of the half bridge.
To guarantee a minimum gate power MOS drive, the IC stops oscillating when V
S
is lower than V
SHIGH2
. It will
restart once the V
S
willbecome higher than V
SHIGH1
. A minimum voltage hysteresis is guaranteed. The IC re-
starts operating at f = F
MAX
,then the frequency shifts towards F
MIN
. The timingof this frequency shifting is T
IGN
(that is: C
P
capacitor is charged and discharged 15 times).Now the oscillator frequency is controlled as in stan-
dard burning condition (feed forward and capacitive mode control). Excess charge on C
S
is drained by an inter-
nal clamp that turns on at voltage V
SCL
.
Groundpins
Pin 7(PGND) is the ground reference of the IC with respect to the application. Pin 11( SGND) provides a local
signal ground reference for the components connected to the pins C
P
, C
I
, R
REF
and C
F
.
Relationship between external components and sistem working condition
L6567 is designed to driveCFL and TL lamps with aminimum part count topology. This feature implies that each
external component is related to one or more circuit operating state.
This table is a short summary of these relationships:
F
MIN
---> R
REF
& C
F
F
FEEDFORWARD
--->C
F
& I
RHV
T
PRE
& T
IGN
---> C
P
& R
REF
F
PRE
---> R
SHUNT
, L, C
L
, LAMP
T
DT
---> R
REF
df/dt ---> C
I
Some useful formulas can well approximate the values:
F
MIN
8 R
REF
C
F
If I
RHV
is greater than:
following expression:
,
the feed forward frequency is settledand the frequency value is fitted by the
---------------------------------
I
RHV
R
REF
--------------
≥
F
FEEDFORWARD
I
121 C
F
---------------------
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6567D | HIGH VOLTAGE DRIVER FOR CFL |
| L6571B | High Voltage Half Bridge Driver with Oscillator(帶晶振的高電壓半橋驅(qū)動(dòng)器) |
| L6585D | PFC and Ballast Control IC |
| L6585DTR | PFC and Ballast Control IC |
| L6590 | Fully Integrated Power Supply FIPSTM(完全集成電源) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6567D | 制造商:STMicroelectronics 功能描述:CFL DRVR 18V 14SOP - Rail/Tube |
| L6569 | 功能描述:功率驅(qū)動(dòng)器IC Hi-Volt Half Bridge RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型: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 |
| L6569 | 制造商:STMicroelectronics 功能描述:IC HALF BRIDGE+OSC 6569 DIP8 |
| L6569A | 功能描述:功率驅(qū)動(dòng)器IC Hi-Volt Half Bridge RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型: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 |
| L6569A | 制造商:STMicroelectronics 功能描述:IC HALF BRIDGE+OSC 6569 DIP8 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。