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参数资料
| 型号： | IR2159STR |
| 厂商： | International Rectifier |
| 文件页数： | 15/25页 |
| 文件大小： | 0K |
| 描述： | IC BALLAST CONTROL DIM 16-SOIC |
| 标准包装： | 2,500 |
| 类型： | 镇流器控制器 |
| 频率： | 25 ~ 95 kHz |
| 电流 - 电源： | 10mA |
| 电源电压： | 12.5 V ~ 15.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 带卷 (TR) |
IR2159/IR21591 (S)
Functional Description
PH/IGN
400
Phase Control
20
10%
350
300
To understand phase control, a simplified model
10
50%
250
for the ballast output stage is used (Figure 1). The
lamp and filaments are replaced with resistors,
0
100%
200
150
with the lamp inserted between the filament
-10
PH/IGN
100
resistors (R1, R2, R3 and R4).
-20
100%
50%
10%
50
0
-50
R1
R2
-30
-100
L
5
10
15
20
25 30
Fr equency [kHz]
35
40
45
50
Vin
Rlamp
C
Figure 2, Typical output stage transfer function for
different lamp power levels.
R3
R4
In the time domain (Figure 3), the input current is
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
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
frequencies slightly above resonance and higher,
the phase is fixed at -90 degrees for the duration
of preheat and ignition. During dimming, the circuit
V in
I in ph/ign
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.
www.irf.com
I in run
0
t
n run
n ph/ign
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.
15
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| IR2161 | 制造商:International Rectifier 功能描述: |
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