参数资料
型号: IR2167STRPBF
厂商: International Rectifier
文件页数: 22/33页
文件大小: 0K
描述: IC PFC BALLAST CTLR 20-SOIC
标准包装: 1,000
类型: PFC/镇流器控制器
频率: 41 ~ 47 kHz
电流 - 电源: 10mA
电源电压: 11.4 V ~ 15.6 V
工作温度: -40°C ~ 125°C
封装/外壳: 20-SOIC(0.295",7.50mm 宽)
供应商设备封装: 20-SOIC(宽型)
包装: 带卷 (TR)
IR2167(S) & PbF
Should high currents occur, the voltage across the current-
sensing resistor (RS) will exceed the 4.3V over-voltage
protection threshold at the VBUS pin and the PFC MOSFET
will turn off safely limiting the current. The watch-dog timer
will then restart the PFC as normal (Figure 14). The current
sensing resistor value should be selected such that the
over-current protection does not false trip during normal
operation over the entire line voltage range and load range.
A current-sensing resistor value, for example, of 1.0 W will
set the over-current protection threshold to about 5 A peak.
Figure 14, PFC inductor current limited using over-current
protection circuit (upper trace: DC Bus, 100V/div; middle
trace: AC line input voltage, 100V/div; lower trace: PFC inductor
current 1A/div).
The effect that these line and load conditions have on the
performance of the ballast depends on the saturation level
of the PFC inductor, the selection of the PFC MOSFET, the
DC bus capacitor value, the maximum on-time limit set by
DZCOMP, and, how fast VCC decreases below UVLO-
22
when the DC bus drops during ignition (the 3V reset on the
VBUS pin does not become active until RUN mode). For
these reasons, the ballast designer should perform these
mains interrupt and ignition tests carefully to determine the
robustness of their final design and to decide if this additional
over-current protection circuit is necessary.
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