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參數(shù)資料
| 型號： | IR2167S |
| 廠商： | International Rectifier |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | PFC Ballast Control. Thermal Overload Protection. Brown Out Protection. Programmable Preheat and Frequency. Programmable Deadtime in a 20 Lead SOIC package |
| 中文描述： | PFC的鎮(zhèn)流器控制。熱過載保護(hù)。欠壓保護(hù)?？删幊填A(yù)熱和頻率。可編程死區(qū)時間在20引腳SOIC封裝 |
| 文件頁數(shù)： | 17/30頁 |
| 文件大?。?/td> | 937K |
| 代理商： | IR2167S |
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IR2167(
S
)
www.irf.com
17
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
Figure 4: IR2167 Ballast Control Sequence
The control sequence used in the IR2167 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 compo-
nent tolerances (please note that it is possible to use the
IR2167 in systems where fstart > fph > fign > frun, simply by
leaving the RUN pin open).
The heart of this controller is an oscillator that
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 RT lead, and the falling portion of the ramp is determined
by an external deadtime resistor RDT. The oscillograph in
Figure 5 illustrates the relationship between the oscillator
capacitor waveform and the gate driver outputs.
This falling portion of the sawtooth waveform is referred to
as deadtime, during which both HO and LO outputs are low.
The deadtime can be programmed by means of the external
RDT resistor.
The RT 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 RT pin current and
the CT capacitor charging current, the value of the RT pin
current should be kept between 50μA and 500μA. The RT
pin can also be used as a feedback point for closed loop
control.
PFC Section
In most AC to DC power converters it is necessary to have
the circuit act as a pure resistive load to the AC input line
voltage. To achieve this, active power factor correction (PFC)
can be implimented which, for an AC input line voltage,
produces an AC input line current. It is also important to
produce a sinusoidal input current which has a low total
harmonic distortion (THD) and a high power factor (PF) (See
Figure 6).
.
Figure 5:
Oscillator Waveforms
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