参数资料
型号: IRS2552DSPBF
厂商: International Rectifier
文件页数: 18/32页
文件大小: 0K
描述: IC BALLAST CTLR CCFL/EEFL 16SOIC
标准包装: 45
类型: CCFL/EEFL 控制器
频率: 39 ~ 69 kHz
电流 - 电源: 10mA
电流 - 输出: 450mA
电源电压: 10.6 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: 管件
IRS2552D
Maximum duty cycle
DC MAX = 0 . 5 ? ( t DT * f )
The ICR charging current during ignition mode and the ICD charging current are given by:
ICR IGN =
0.06
R MIN
ICD =
0.06
R MIN
The ICR charging current and frequency during run mode are given by:
ICR RUN =
1 . 8
R MIN
f CR =
0 . 36
R MIN ? C CR
Dimming Function
The IRS2552D supports burst mode dimming, meaning that the output drive to the lamps is pulsed on and off at
a low frequency and the burst duty cycle is adjusted to control the average current and therefore the light output
of the lamps. The IRS2552D contains a low frequency oscillator that generates a ramp waveform at the CR pin
from 0 V to 5 V. The ramp frequency is dependent on the value of the external C R capacitor. A DC dimming
control voltage is fed into the DIM pin which is compared with the dimming ramp by means of an internal
comparator, which generates the PWM signal that is used internally to switch the outputs on and off. Thus when
the DIM voltage is at 5 V the outputs will be on all of the time and when it is at 0 V the outputs will be off all of the
time. Alternatively a PWM dimming control signal from 0 V to 5 V can be fed directly into the DIM pin to allow
external PWM control independent of the dimming ramp. During the off period the LO and HO outputs are both
low.
www.irf.com
18
? 2009 International Rectifier
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