参数资料
型号: IRPLLNR4
厂商: International Rectifier
文件页数: 11/20页
文件大小: 0K
描述: BALLAST UNIV INP FLUOR IR2166
标准包装: 1
其它名称: *IRPLLNR4
I
Figure 3 shows a plot of the half-bridge oscillation frequency as a function of time for all of the normal
modes of operation: Preheat mode, Ignition Ramp mode and Run mode.
f osc
f Preheat
f Run
f Ignition
t
preheat
ignition
run
Figure 3: Oscillator frequency versus time, normal operating conditions
The duration of the Preheat mode as well as the mode of operation of the ballast are determined by
the voltage on the CPH pin of the IR2166. At the completion of the UVLO mode, Preheat mode is
entered and an internal current source is activated at the CPH pin of the IR2166, which begins to
charge up capacitor CPH. The ballast remains in the Preheat mode until the voltage on the CPH pin
exceeds the Ignition Ramp mode threshold (10V).
Ignition Ramp Mode
At the completion of the Preheat mode the ballast switches to the Ignition Ramp mode and the
frequency ramps down to the run frequency. Resistor RPH is no longer connected directly in parallel
with resistor RT so the run frequency is determined only with RT. During this ramping downward of
the frequency, the voltage across the lamp increases in magnitude as the frequency approaches the
www.irf.com
RD-0602
11
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