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参数资料
| 型号： | IR2159S |
| 厂商： | International Rectifier |
| 英文描述： | DIMMING BALLAST CONTROL IC |
| 中文描述： | 调光镇流器控制IC |
| 文件页数： | 14/25页 |
| 文件大小： | 267K |
| 代理商： | IR2159S |
IR21592/IR21593
(S)
14
www.irf.com
Functional Description
Phase Control
To understand phase control, a simplified model
for the ballast output stage is used (Figure 1). The
lamp and filaments are replaced with resistors,
with the lamp inserted between the filament
resistors (R1, R2, R3 and R4).
L
C
Rlamp
Vin
R1
R2
R3
R4
Figure 1, Dimming ballast output stage.
During preheat and ignition (Figure 2), the circuit
is a high-Q series LC with a strong input current to
input voltage phase inversion from +90 to -90
degrees at the resonance frequency. For operating
frequencies slightly above resonance and higher,
the phase is fixed at -90 degrees for the duration
of preheat and ignition. During dimming, the circuit
is an L in series with a parallel R and C, with a
weak phase inversion at high lamp power and a
strong phase inversion at low lamp power.
-30
-20
-10
0
10
20
5
10
15
20
25
30
35
40
45
50
Frequency [kHz]
M
-100
-50
0
50
100
150
200
250
300
350
400
P
10%
50%
100%
100%
50%
10%
PH/IGN
PH/IGN
Figure 2, Typical output stage transfer function for
different lamp power levels.
In the time domain (Figure 3), the input current is
shifted -90 degrees from the input half-bridge
voltage during preheat and ignition, and
somewhere between 0 and -90 degrees after
ignition during running. Zero phase-shift
corresponds to maximum power.
n
run
n
ph/ign
V
in
I
in
t
ph/ign
0
I
inrun
Figure 3, Typical ballast output stage waveforms.
When the phase is calculated and plotted versus
lamp power (Figure 4), the result is a linear dimming
curve, even down to ultra-low light levels where
the resistance of the lamp can change by orders
of magnitude.
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| IR2161 | 制造商:International Rectifier 功能描述: |
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| IR2161S | 制造商:International Rectifier 功能描述: |
| IR2161SPBF | 功能描述:功率驱动器IC HALOGEN CONVERTER CTRLR 500mA 1W RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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