参数资料
型号: IRPLLNR3
厂商: International Rectifier
英文描述: Universal Input Linear Fluorescent Ballast using the IR2167
中文描述: 通用输入线性荧光灯镇流器用IR2167
文件页数: 13/27页
文件大小: 341K
代理商: IRPLLNR3
www.irf.com
13
RPLLNR3
Figure 8:
Ignition ramp (crossed lamps)
During the Ignition Ramp mode the voltage on the CPH pin of the IR2167 continues to ramp up until
the voltage at the CPH pin of the IR2167 exceeds the Run mode threshold (5.1V). Over-current
sensing is also enabled at the beginning of the Ignition Ramp mode. A full explanation of the function-
ality of the over-current sensing is in the section on Fault Mode.
Run Mode
At the end of the Ignition Ramp mode (CPH pin > 5.1V) the ballast switches to the Run mode at which
point the frequency is shifted to the run frequency. The run frequency is determined by the parallel
combination of resistors RT and RRUN and capacitor CT. Resistor RRUN is connected in parallel by
turning on the internal open drain MOSFET connected to the RUN pin of the IR2167 (see IR2167
block diagram). The sensing of under-current conditions and the 1-3V window comparator in the SD
pin are also enabled at the beginning of the Run mode. The full explanation of the functionality of the
under-current sensing and end-of-life sensing is in the section on Fault Mode. Figure 9 shows the
functionality of the CPH, RPH and RUN pins of the IR2167 during Startup, Preheat, Ignition Ramp
and Run modes.
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