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參數資料
| 型號： | IR21571 |
| 廠商： | International Rectifier |
| 英文描述： | FULLY INTEGRATED BALLAST CONTROL IC |
| 中文描述： | 完全集成的鎮(zhèn)流器控制IC |
| 文件頁數： | 9/17頁 |
| 文件大?。?/td> | 234K |
| 代理商： | IR21571 |
IR21571
(S)
www.irf.com
9
The Control Sequence & Timing
Component Selection
The IR21571 uses the following control sequence
(Figure 3) to drive rapid start fluorescent lamps.
The control sequence used in the IR21571 allows
the Run Mode operating frequency of the ballast to
be higher than the ignition frequency (i.e., fstart >
fph > frun > fign). This control sequence is
recommended for lamp types where the ignition
frequency is too close to the run frequency to ensure
proper lamp striking for all production resonant LC
component tolerances (please note that it is possible
to use the IR21571 in systems where fstart > fph >
fign > frun, simply by leaving the RUN lead open).
Six leads in the IC are used to control the
Startup,
Preheat, Ignition Ramp,
and
Run
modes of
operation, and to allow ballast and lamp engineers
the flexibility to optimize their designs for virtually
any lamp type.
The heart of this controller is an oscillator which
resembles those found in many popular PWM voltage
regulator ICs. In its simplest form, this oscillator
consists of a timing resistor and capacitor connected
to ground. The voltage across the timing capacitor
CT is a sawtooth, where the rising portion of the ramp
is determined by the current in the R
T
lead, and the
falling portion of the ramp is determined by an external
deadtime resistor R
DT
. The oscillograph in Figure 4
illustrates the relationship between the oscillator
capacitor waveform and the gate driver outputs.
The deadtime can be programmed by means of the
external R
DT
resistor, given a certain range of CT
capacitor values, using the graph shown in Figure 5.
The R
T
input is a voltage-controlled current source,
where the voltage is regulated to be approximately
2.0V. In order to maintain proper linearity between
the R
T
lead current and the C
T
capacitor charging
current, the value of the R
T
lead current should be
kept between 50μA and 500μA. The R
T
lead can
also be used as a feedback point for closed loop
control.
Figure 3: IR21571 control sequence
Figure 4
f
PH
f
Run
f
min
f
t
f
Start
V
CPH
5V
V
RPH
2V
V
RUN
2V
Preheat mode
Ignition
Ramp
mode
Run mode
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相關代理商/技術參數 |
參數描述 |
|---|---|
| IR21571PBF | 功能描述:功率驅動器IC Ballast Cntrl Thrml Ovrload Prot 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 |
| IR21571PBF | 制造商:International Rectifier 功能描述:Controller IC Output Voltage Max.:25V |
| IR21571S | 功能描述:IC BALLAST CONTROL 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| IR21571SPBF | 功能描述:功率驅動器IC BALLAST CTRL BELO 600V 15.6V VCC 150uA 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 |
| IR21571STR | 功能描述:IC BALLAST CONTROL INTEG 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
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